feat: implement XInput mode (#27)

Reviewed-on: NaxdyOrg/NaxGCC-FW#27

.changelogs/v1.0.0.md

@@ -0,0 +1,13 @@
+This marks the very first release of the NaxGCC firmware!
+
+Compared to the PhobGCC firmware, the NaxGCC firmware has the following changes:
+
+- fully rewritten in Rust, using the [embassy-rs](https://github.com/embassy-rs/embassy) framework for asynchronous operations
+- directly connects to the console via USB, pretending to be a GCC adapter with 1 controller (itself) connected
+- features a special "input consistency mode" that even further improves input consistency, beyond what is delivered by any other controller / adapter
+- features an experimental "input latency mode" that reduces input latency even further, at a slight cost to input consistency compared to "consistency" mode
+- improves button scan rate to ~50us (microseconds) compared to 1ms for the PhobGCC
+- a few calibration button combos have changed (consult our documentation for details)
+- pressing `A+X+Y` while plugging in the controller to your PC will enter bootloader mode, allowing you to flash a new firmware image
+
+Huge thank you to the developers of the PhobGCC for providing a solid foundation to build upon!

.changelogs/v1.1.0.md

@@ -0,0 +1,7 @@
+This is mainly a QoL and performance update for the NaxGCC. The following changes have been made:
+
+- Added a MSOS descriptor to the USB device, allowing the NaxGCC to be immediately recognized on Windows, without the need for a custom driver. This should make it plug-and-play for Dolphin on Windows.
+- Improved the "rate limiting" of SuperHack mode, which should make it more consistent and less likely to drop inputs compared to "Consistency" mode.
+- Added a new "PC" mode which polls at 1000Hz, for use on PC or other consoles that don't have any issues with 1000Hz polling. The "OG" mode now polls at 125Hz always, regardless of which device it is connected to.
+
+To update your firmware, plug in your controller while keeping the `A+X+Y` buttons held. Then drag & drop the `.uf2` file (found below, under Downloads) onto the storage device that appears.

.changelogs/v1.1.1.md

@@ -0,0 +1 @@
+v1.1.0.md

.changelogs/v1.2.0.md

@@ -0,0 +1,12 @@
+This release introduces a major new feature to combat a regression introduced in Switch firmware 19.0.0. For those unaware, Switch firmware 19.0.0 breaks compatibility with GCC adapters, including NaxGCC, which advertises itself as a GCC adapter.
+
+Starting with this version, you will be able to connect NaxGCC in "Pro-Controller Mode" by pressing and holding `Start` while plugging it in. This will cause the NaxGCC to advertise itself as a Nintendo Switch Pro Controller, and therefore be unaffected by the bug in the latest Switch firmware. All input consistency modes remain fully functional while in this mode, and your settings (including calibration) carry over as well.
+
+While in Pro-Controller Mode, pressing `Z+Start` will act like the home button on a regular Pro Controller. Additionally, pressing `L` will press both `L` and `ZL` at the same time (since the GCC only has one left shoulder button). This is useful if you want to map things like jump (short-hop macro) or shield (prevent rolling) to it.
+
+> [!NOTE]
+> As of this version, rumble will _not_ work while in Pro Controller Mode.
+
+---
+
+To update your firmware, plug in your controller to your computer while keeping the `A+X+Y` buttons held. Then drag & drop the `.uf2` file (found below, under Downloads) onto the storage device that appears.

.changelogs/v1.3.0.md

@@ -0,0 +1,10 @@
+This release introduces XInput mode for the NaxGCC. This mode is mostly useful for playing games on PC, as it offers the best out-of-the-box compatiblity experience with most titles. Similar to Pro-Controller Mode, this is not a permanent configuration that you set, but a mode that is activated by pressing a button while plugging your controller in.
+
+To enter XInput Mode, press and hold the `X` button while plugging in your controller. While in XInput mode, your NaxGCC will _always_ poll at 1ms intervals, regardless of your chosen input consistency mode setting. Once you go back to GCC or Pro-Controller Mode, your desired input consistency setting will be restored.
+
+> [!NOTE]
+> As of this version, rumble will _not_ work while in XInput mode.
+
+---
+
+To update your firmware, plug in your controller to your computer while keeping the `A+X+Y` buttons held. Then drag & drop the `.uf2` file (found below, under Downloads) onto the storage device that appears.

.forgejo/workflows/clippy-check.yml

@@ -2,18 +2,25 @@ name: Code quality
 
 on: pull_request
 
+concurrency:
+  group: ${{ env.GITHUB_HEAD_REF }}
+  cancel-in-progress: true
+
 jobs:
   check:
     runs-on: nix-flakes
 
     steps:
-      - name: Set up packages
-        run: |
-          echo "extra-substituters = https://builder.naxdy.org/attic" >> /etc/nix/nix.conf
-          echo "extra-trusted-public-keys = attic:05LdE8Nav5Qd1E+KOJqSwdr+WE1z8AUmSb3oKL7s8dk=" >> /etc/nix/nix.conf
-          nix profile install nixpkgs#nodejs "github:zhaofengli/attic?ref=6eabc3f02fae3683bffab483e614bebfcd476b21"
-          echo "PATH=/nix/var/nix/profiles/per-user/root/profile/bin:$PATH" >> "$GITHUB_ENV"
       - uses: actions/checkout@v4
+
+      - name: Set up attic binary cache
+        uses: https://git.naxdy.org/NaxdyOrg/attic-action@v0.3
+        with:
+          endpoint: "${{ vars.BINARY_CACHE_URL }}"
+          token: ""
+          cache: "${{ vars.PUBLIC_BINARY_CACHE_NAME }}"
+          skip-push: true
+
       - name: Run Clippy
         run: |
-          nix develop . --command cargo clippy -- -Dwarnings
+          nix flake check . --print-build-logs -j auto

.forgejo/workflows/nightly-release.yml

@@ -13,24 +13,22 @@ jobs:
     runs-on: nix-flakes
 
     steps:
-      - name: Set up packages
-        run: |
-          echo "extra-substituters = https://builder.naxdy.org/attic" >> /etc/nix/nix.conf
-          echo "extra-trusted-public-keys = attic:05LdE8Nav5Qd1E+KOJqSwdr+WE1z8AUmSb3oKL7s8dk=" >> /etc/nix/nix.conf
-          nix profile install nixpkgs#nodejs "github:zhaofengli/attic?ref=6eabc3f02fae3683bffab483e614bebfcd476b21"
-          echo "PATH=/nix/var/nix/profiles/per-user/root/profile/bin:$PATH" >> "$GITHUB_ENV"
       - name: Set up attic binary cache
-        run: |
-          attic login "${{ vars.PUBLIC_BINARY_CACHE_NAME }}" "${{ vars.BINARY_CACHE_URL }}" "${{ secrets.PUBLIC_BINARY_CACHE_AUTH_KEY }}"
-          attic use "${{ vars.PUBLIC_BINARY_CACHE_NAME }}"
+        uses: https://git.naxdy.org/NaxdyOrg/attic-action@v0.3
+        with:
+          endpoint: "${{ vars.BINARY_CACHE_URL }}"
+          token: "${{ secrets.PUBLIC_BINARY_CACHE_AUTH_KEY }}"
+          cache: "${{ vars.PUBLIC_BINARY_CACHE_NAME }}"
       - uses: actions/checkout@v4
+
+      - name: Run flake checks
+        run: |
+          nix flake check . --print-build-logs -j auto
+
       - name: Build firmware image
         run: |
           nix build .# -o dist --print-build-logs
-      - name: Push derivations to binary cache
-        run: |
-          cd /nix/store
-          attic push "${{ vars.PUBLIC_BINARY_CACHE_NAME }}" $(ls /nix/store --ignore='*.drv' --ignore='*fake_nixpkgs*')
+
       - name: (Re-)generate tag
         run: |
           git config --global user.email "noreply@naxdy.org"
@@ -40,6 +38,7 @@ jobs:
           git tag nightly -m "Nightly Release"
           git checkout nightly
           git push --set-upstream origin nightly --force
+
       - name: Publish nightly release
         uses: https://gitea.com/actions/gitea-release-action@v1.3.0
         with:
@@ -48,7 +47,7 @@ jobs:
           prerelease: true
           name: "Nightly Release"
           body: >
-            This is an automatically generated nightly release.
+            This is an automatically generated nightly release, based on the current state of the `main` branch.
 
             **WARNING:** This release may contain untested changes and could potentially break your configuration. Use at your own risk. **Do not report issues you encounter with nightly releases.**
           files: |

.forgejo/workflows/stable-release.yml

@@ -0,0 +1,31 @@
+name: Publish stable release
+
+on:
+  push:
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+
+jobs:
+  build:
+    runs-on: nix-flakes
+
+    steps:
+      - name: Set up attic binary cache
+        uses: https://git.naxdy.org/NaxdyOrg/attic-action@v0.3
+        with:
+          endpoint: "${{ vars.BINARY_CACHE_URL }}"
+          token: "${{ secrets.PUBLIC_BINARY_CACHE_AUTH_KEY }}"
+          cache: "${{ vars.PUBLIC_BINARY_CACHE_NAME }}"
+      - uses: actions/checkout@v4
+      - name: Build firmware image
+        run: |
+          nix build .# -o dist --print-build-logs
+      - name: Publish stable release
+        uses: https://gitea.com/actions/gitea-release-action@v1.3.0
+        with:
+          token: "${{ github.token }}"
+          tag_name: "${{ env.GITHUB_REF_NAME }}"
+          name: "NaxGCC ${{ env.GITHUB_REF_NAME }}"
+          body_path: .changelogs/${{ env.GITHUB_REF_NAME }}.md
+          files: |
+            dist/bin/*

.github/workflows/no-pr.yml

@@ -0,0 +1,21 @@
+name: Close pull request
+
+on:
+  pull_request_target:
+    types:
+      - opened
+
+jobs:
+  close-pr:
+    permissions:
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - run: gh pr close "$NUMBER" --comment "$COMMENT"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+          NUMBER: ${{ github.event.number }}
+          COMMENT: >
+            Thank you for submitting your pull request.
+            Please note that the main repository is located at https://git.naxdy.org/NaxdyOrg/NaxGCC-FW - please submit your pull request there if you would like it to be considered for merging.

CONTRIBUTING.md

@@ -0,0 +1,53 @@
+# Contributing
+
+If you'd like to contribute to the development of the NaxGCC firmware, you're in the right place! This document will guide you through the process of setting up your development environment, building the firmware, testing it on your controller, and submitting your changes for review.
+
+## Getting Started
+
+The firmware is built using [nix](https://nixos.org/), a package manager that provides a consistent development environment across different systems. The easiest way for you to get going is to install nix on your system, [enable flakes](https://nixos.wiki/wiki/Flakes), and then run the following command:
+
+```sh
+nix develop .
+```
+
+This will begin downloading all the necessary development tools, such as Rust and the ARM toolchain, and will drop you into a shell where you can immediately run `cargo build` to build the firmware, without any additional setup. From this shell, you can also run your favorite text editor, and it will also have access to all the necessary tools.
+
+If you want to take this a step further, you can install [direnv](https://direnv.net/), which will automatically drop you into a development shell whenever you enter the project directory. It also has a corresponding [VSCode extension](https://marketplace.visualstudio.com/items?itemName=mkhl.direnv) that will automatically set up your environment when you open the project in VSCode/VSCodium.
+
+### Building the firmware
+
+To build the firmware, simply run:
+
+```sh
+cargo build
+```
+
+for a development build, and
+
+```sh
+nix build .#
+```
+
+for a release build. Release builds will be placed in `./result/bin/` and can be flashed to your controller by simply dragging & dropping the `.uf2` file onto the controller while it's in bootloader mode (press `A+X+Y` while plugging it in).
+
+### Debugging
+
+The NaxGCC board exposes all the necessary pins to hook up a Pico debug probe. Running
+
+```sh
+cargo run
+```
+
+will automatically look for connected debug probes and use the first one it finds to flash the firmware to the controller.
+
+## Submitting your changes
+
+When you're ready to submit your changes, simply push your branch to the repository and open a pull request. The CI will automatically run tests on your changes, and a maintainer will review your code. If everything looks good, your changes will be merged into the main branch.
+
+### Things not to submit
+
+We strive to keep the NaxGCC firmware as clean and minimal as possible. As such, we have a few guidelines for contributions:
+
+- **No Melee-specific features**: The primary focus of the NaxGCC firmware is Smash Ultimate and other Nintendo Switch games. As such, features that are solely beneficial for emulated Melee gameplay (e.g. analog trigger functionality) will probably be rejected. Keep in mind that you cannot use a NaxGCC on an actual GameCube/Wii anyway!
+- **No time-based macros or other automation**: The NaxGCC firmware is designed to be tournament-legal, and as such, we do not allow any form of automation or macros that could give players an unfair advantage. Input filters and other simple "if-then" logic is acceptable (see [input_filter.rs](https://git.naxdy.org/NaxdyOrg/NaxGCC-FW/src/branch/main/src/input_filter.rs) for examples), but anything more complex will be rejected. The rule of thumb is: If it can be reasonably implemented as a hardware mod, it's probably fine.
+- **No feature bloat**: We aim to keep the firmware as minimal as possible, to reduce the risk of bugs and to keep the codebase maintainable. As such, we will reject any features that are not deemed essential for the core functionality of the controller. This is especially important since the RP2040 executes the majority of code from flash, thus binary size matters. Performance improvements are always welcome, though.

Cargo.lock

@@ -1,8 +1,19 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-# A Comment
 version = 3
 
+[[package]]
+name = "ahash"
+version = "0.8.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e89da841a80418a9b391ebaea17f5c112ffaaa96f621d2c285b5174da76b9011"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "1.1.2"
@@ -78,6 +89,12 @@ version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "46afbd2983a5d5a7bd740ccb198caf5b82f45c40c09c0eed36052d91cb92e719"
 
+[[package]]
+name = "bitfield"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d7e60934ceec538daadb9d8432424ed043a904d8e0243f3c6446bce549a46ac"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -110,9 +127,9 @@ checksum = "a2ef034f05691a48569bd920a96c81b9d91bbad1ab5ac7c4616c1f6ef36cb79f"
 
 [[package]]
 name = "byteorder"
-version = "1.4.3"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
 [[package]]
 name = "cfg-if"
@@ -137,7 +154,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ec610d8f49840a5b376c69663b6369e71f4b34484b9b2eb29fb918d92516cb9"
 dependencies = [
  "bare-metal",
- "bitfield",
+ "bitfield 0.13.2",
  "embedded-hal 0.2.7",
  "volatile-register",
 ]
@@ -310,7 +327,8 @@ checksum = "11157ac094ffbdde99aa67b23417ebdd801842852b500e395a45a9c0aac03e4a"
 
 [[package]]
 name = "embassy-embedded-hal"
-version = "0.1.0"
+version = "0.2.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "defmt",
  "embassy-futures",
@@ -326,7 +344,8 @@ dependencies = [
 
 [[package]]
 name = "embassy-executor"
-version = "0.5.0"
+version = "0.6.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "cortex-m",
  "critical-section",
@@ -339,7 +358,8 @@ dependencies = [
 
 [[package]]
 name = "embassy-executor-macros"
-version = "0.4.0"
+version = "0.5.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "darling",
  "proc-macro2",
@@ -350,13 +370,15 @@ dependencies = [
 [[package]]
 name = "embassy-futures"
 version = "0.1.1"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "defmt",
 ]
 
 [[package]]
 name = "embassy-hal-internal"
-version = "0.1.0"
+version = "0.2.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "cortex-m",
  "critical-section",
@@ -367,10 +389,12 @@ dependencies = [
 [[package]]
 name = "embassy-net-driver"
 version = "0.2.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 
 [[package]]
 name = "embassy-net-driver-channel"
-version = "0.2.0"
+version = "0.3.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "embassy-futures",
  "embassy-net-driver",
@@ -379,7 +403,8 @@ dependencies = [
 
 [[package]]
 name = "embassy-rp"
-version = "0.1.0"
+version = "0.2.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "atomic-polyfill",
  "cfg-if",
@@ -404,7 +429,6 @@ dependencies = [
  "embedded-storage",
  "embedded-storage-async",
  "fixed",
- "futures",
  "nb 1.1.0",
  "pio",
  "pio-proc",
@@ -415,7 +439,8 @@ dependencies = [
 
 [[package]]
 name = "embassy-sync"
-version = "0.5.0"
+version = "0.6.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "cfg-if",
  "critical-section",
@@ -427,7 +452,8 @@ dependencies = [
 
 [[package]]
 name = "embassy-time"
-version = "0.3.0"
+version = "0.3.2"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "cfg-if",
  "critical-section",
@@ -445,6 +471,7 @@ dependencies = [
 [[package]]
 name = "embassy-time-driver"
 version = "0.1.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "document-features",
 ]
@@ -452,10 +479,12 @@ dependencies = [
 [[package]]
 name = "embassy-time-queue-driver"
 version = "0.1.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 
 [[package]]
 name = "embassy-usb"
-version = "0.1.0"
+version = "0.3.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "defmt",
  "embassy-futures",
@@ -470,6 +499,7 @@ dependencies = [
 [[package]]
 name = "embassy-usb-driver"
 version = "0.1.0"
+source = "git+https://git.naxdy.org/NaxdyOrg/embassy.git?branch=naxgcc-fw#16151cce0271573a66206aa6e85932c20bbf0c70"
 dependencies = [
  "defmt",
 ]
@@ -631,59 +661,12 @@ version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6d5a32815ae3f33302d95fdcb2ce17862f8c65363dcfd29360480ba1001fc9c"
 
-[[package]]
-name = "futures"
-version = "0.3.30"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "645c6916888f6cb6350d2550b80fb63e734897a8498abe35cfb732b6487804b0"
-dependencies = [
- "futures-channel",
- "futures-core",
- "futures-io",
- "futures-sink",
- "futures-task",
- "futures-util",
-]
-
-[[package]]
-name = "futures-channel"
-version = "0.3.30"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eac8f7d7865dcb88bd4373ab671c8cf4508703796caa2b1985a9ca867b3fcb78"
-dependencies = [
- "futures-core",
- "futures-sink",
-]
-
 [[package]]
 name = "futures-core"
 version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dfc6580bb841c5a68e9ef15c77ccc837b40a7504914d52e47b8b0e9bbda25a1d"
 
-[[package]]
-name = "futures-io"
-version = "0.3.30"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a44623e20b9681a318efdd71c299b6b222ed6f231972bfe2f224ebad6311f0c1"
-
-[[package]]
-name = "futures-macro"
-version = "0.3.30"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87750cf4b7a4c0625b1529e4c543c2182106e4dedc60a2a6455e00d212c489ac"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.52",
-]
-
-[[package]]
-name = "futures-sink"
-version = "0.3.30"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9fb8e00e87438d937621c1c6269e53f536c14d3fbd6a042bb24879e57d474fb5"
-
 [[package]]
 name = "futures-task"
 version = "0.3.30"
@@ -697,8 +680,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d6401deb83407ab3da39eba7e33987a73c3df0c82b4bb5813ee871c19c41d48"
 dependencies = [
  "futures-core",
- "futures-macro",
- "futures-sink",
  "futures-task",
  "pin-project-lite",
  "pin-utils",
@@ -734,6 +715,15 @@ dependencies = [
  "byteorder",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43a3c133739dddd0d2990f9a4bdf8eb4b21ef50e4851ca85ab661199821d510e"
+dependencies = [
+ "ahash",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.14.3"
@@ -769,7 +759,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7b0b929d511467233429c45a44ac1dcaa21ba0f5ba11e4879e6ed28ddb4f9df4"
 dependencies = [
  "equivalent",
- "hashbrown",
+ "hashbrown 0.14.3",
 ]
 
 [[package]]
@@ -876,7 +866,7 @@ checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"
 
 [[package]]
 name = "naxgcc-fw"
-version = "0.1.0"
+version = "1.3.0"
 dependencies = [
  "cortex-m",
  "cortex-m-rt",
@@ -898,7 +888,6 @@ dependencies = [
  "portable-atomic",
  "rand",
  "static_cell",
- "tiny_sort",
 ]
 
 [[package]]
@@ -1429,12 +1418,6 @@ dependencies = [
  "crunchy",
 ]
 
-[[package]]
-name = "tiny_sort"
-version = "1.0.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3bbd7912d5028a8f218a772a794fee0104b46ea1f6e747ff0a4fdbb5dc024a6"
-
 [[package]]
 name = "typenum"
 version = "1.17.0"
@@ -1461,15 +1444,19 @@ checksum = "f962df74c8c05a667b5ee8bcf162993134c104e96440b663c8daa176dc772d8c"
 
 [[package]]
 name = "usb-device"
-version = "0.2.9"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f6cc3adc849b5292b4075fc0d5fdcf2f24866e88e336dd27a8943090a520508"
+checksum = "98816b1accafbb09085168b90f27e93d790b4bfa19d883466b5e53315b5f06a6"
+dependencies = [
+ "heapless",
+ "portable-atomic",
+]
 
 [[package]]
 name = "usbd-hid"
-version = "0.6.1"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "975bd411f4a939986751ea09992a24fa47c4d25c6ed108d04b4c2999a4fd0132"
+checksum = "e6f291ab53d428685cc780f08a2eb9d5d6ff58622db2b36e239a4f715f1e184c"
 dependencies = [
  "serde",
  "ssmarshal",
@@ -1479,20 +1466,22 @@ dependencies = [
 
 [[package]]
 name = "usbd-hid-descriptors"
-version = "0.1.2"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcbee8c6735e90894fba04770bc41e11fd3c5256018856e15dc4dd1e6c8a3dd1"
+checksum = "0eee54712c5d778d2fb2da43b1ce5a7b5060886ef7b09891baeb4bf36910a3ed"
 dependencies = [
- "bitfield",
+ "bitfield 0.14.0",
 ]
 
 [[package]]
 name = "usbd-hid-macros"
-version = "0.6.0"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "261079a9ada015fa1acac7cc73c98559f3a92585e15f508034beccf6a2ab75a2"
+checksum = "bb573c76e7884035ac5e1ab4a81234c187a82b6100140af0ab45757650ccda38"
 dependencies = [
  "byteorder",
+ "hashbrown 0.13.2",
+ "log",
  "proc-macro2",
  "quote",
  "serde",
@@ -1695,3 +1684,23 @@ checksum = "05f360fc0b24296329c78fda852a1e9ae82de9cf7b27dae4b7f62f118f77b9ed"
 dependencies = [
  "tap",
 ]
+
+[[package]]
+name = "zerocopy"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.52",
+]

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "naxgcc-fw"
-version = "0.1.0"
+version = "1.3.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
@@ -9,33 +9,33 @@ edition = "2021"
 embassy-time = { version = "0.3.0", features = [
     "defmt",
     "defmt-timestamp-uptime",
-], path = "lib/embassy-rs/embassy-time" }
-embassy-embedded-hal = { version = "0.1.0", features = [
+], git = "https://git.naxdy.org/NaxdyOrg/embassy.git", branch = "naxgcc-fw" }
+embassy-embedded-hal = { version = "0.2.0", features = [
     "defmt",
-], path = "lib/embassy-rs/embassy-embedded-hal" }
-embassy-sync = { version = "0.5.0", features = [
+], git = "https://git.naxdy.org/NaxdyOrg/embassy.git", branch = "naxgcc-fw" }
+embassy-sync = { version = "0.6.0", features = [
     "defmt",
-], path = "lib/embassy-rs/embassy-sync" }
-embassy-executor = { version = "0.5.0", features = [
+], git = "https://git.naxdy.org/NaxdyOrg/embassy.git", branch = "naxgcc-fw" }
+embassy-executor = { version = "0.6.0", features = [
     "task-arena-size-32768",
     "arch-cortex-m",
     "executor-thread",
     "executor-interrupt",
     "defmt",
     "integrated-timers",
-], path = "lib/embassy-rs/embassy-executor" }
-embassy-rp = { version = "0.1.0", features = [
+], git = "https://git.naxdy.org/NaxdyOrg/embassy.git", branch = "naxgcc-fw" }
+embassy-rp = { version = "0.2.0", features = [
     "defmt",
     "unstable-pac",
     "time-driver",
     "critical-section-impl",
-], path = "lib/embassy-rs/embassy-rp" }
-embassy-usb = { version = "0.1.0", features = [
+], git = "https://git.naxdy.org/NaxdyOrg/embassy.git", branch = "naxgcc-fw" }
+embassy-usb = { version = "0.3.0", features = [
     "defmt",
-], path = "lib/embassy-rs/embassy-usb" }
+], git = "https://git.naxdy.org/NaxdyOrg/embassy.git", branch = "naxgcc-fw" }
 embassy-futures = { version = "0.1.0", features = [
     "defmt",
-], path = "lib/embassy-rs/embassy-futures" }
+], git = "https://git.naxdy.org/NaxdyOrg/embassy.git", branch = "naxgcc-fw" }
 defmt = "0.3"
 defmt-rtt = "0.4"
 fixed = "1.23.1"
@@ -48,12 +48,9 @@ libm = { version = "0.2.8" }
 cortex-m = { version = "0.7.6", features = ["inline-asm"] }
 cortex-m-rt = "0.7.0"
 panic-probe = { version = "0.3", features = ["print-defmt"] }
-packed_struct = { version = "0.10.1", default_features = false }
+packed_struct = { version = "0.10.1", default-features = false }
 format_no_std = "1.0.2"
 rand = { version = "0.8.5", default-features = false }
-tiny_sort = { version = "1.0.5", default-features = false, features = [
-    "unstable",
-] }
 
 # cargo build/run
 [profile.dev]
@@ -61,7 +58,7 @@ codegen-units = 1
 debug = 2
 debug-assertions = true
 incremental = false
-opt-level = 1
+opt-level = 3
 lto = "fat"
 overflow-checks = true
 
@@ -74,7 +71,7 @@ incremental = false
 lto = 'fat'
 # opt level needs to be benchmarked after every major feature
 # due to the changes in binary size and alignment
-opt-level = 2
+opt-level = 3
 overflow-checks = false
 
 # do not optimize proc-macro crates = faster builds from scratch
@@ -82,14 +79,14 @@ overflow-checks = false
 codegen-units = 8
 debug = false
 debug-assertions = false
-opt-level = 0
+opt-level = 3
 overflow-checks = false
 
 [profile.release.build-override]
 codegen-units = 8
 debug = false
 debug-assertions = false
-opt-level = 0
+opt-level = 3
 overflow-checks = false
 
 # cargo test
@@ -109,12 +106,3 @@ debug-assertions = false
 incremental = false
 lto = 'fat'
 opt-level = 3
-
-# [patch.crates-io]
-# embassy-rp = { path = "lib/embassy-rs/embassy-rp" }
-# embassy-time = { path = "lib/embassy-rs/embassy-time" }
-# embassy-embedded-hal = { path = "lib/embassy-rs/embassy-embedded-hal" }
-# embassy-usb = { path = "lib/embassy-rs/embassy-usb" }
-# embassy-sync = { path = "lib/embassy-rs/embassy-sync" }
-# embassy-executor = { path = "lib/embassy-rs/embassy-executor" }
-# embassy-futures = { path = "lib/embassy-rs/embassy-futures" }

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+
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+software and other kinds of works.
+
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+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
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+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
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+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -1,8 +1,20 @@
 # NaxGCC
 
+The main repository is located at [git.naxdy.org](https://git.naxdy.org/NaxdyOrg/NaxGCC-FW). The GitHub mirror exists solely for the sake of discoverability and redundancy.
+
+> **Please do not submit issues or pull requests on GitHub.**
+
+Find the latest releases here: https://git.naxdy.org/NaxdyOrg/NaxGCC-FW/releases
+
+Full documentation is available at [gcc.naxdy.org](https://gcc.naxdy.org/).
+
+Join the NaxGCC matrix chat at [#naxgcc:naxdy.org](https://matrix.to/#/#naxgcc:naxdy.org) to discuss development or ask for help.
+
+---
+
 This repo houses the firmware for the NaxGCC, a GameCube-style controller built on the [PhobGCC](https://github.com/PhobGCC/PhobGCC-SW). The firmware can also be used as an optional firmware for the PhobGCC, though the PhobGCC will then have to be connected to the console directly via USB.
 
-Like the PhobGCC, the NaxGCC uses hall effect sensors instead of potentiometers for stick input. Additionally, it connects directly to the console via USB, by pretending to be a GCC adapter with 1 controller (itself) connected. This eliminates one additional layer of polling, and thus reduces perceived latency and improves input consistency. The NaxGCC firmware makes use of the [embassy-rs](https://github.com/embassy-rs/embassy) framework for asynchronous operations. Mainly, this means that the firmware is capable of polling the sticks and buttons at different frequencies, further improving input consistency and latency for button inputs.
+Like the PhobGCC, the NaxGCC uses hall effect sensors instead of potentiometers for stick input. Additionally, it connects directly to the console via USB, by pretending to be a GCC adapter with 1 controller (itself) connected. This eliminates one additional layer of polling, and thus reduces perceived latency and improves input consistency. The NaxGCC also features a special "input consistency mode" that even further improves input consistency, beyond what is delivered by any other controller / adapter. The NaxGCC firmware makes use of the [embassy-rs](https://github.com/embassy-rs/embassy) framework for asynchronous operations. Mainly, this means that the firmware is capable of polling the sticks and buttons at different frequencies, further improving input consistency and latency for button inputs.
 
 ### Key Aspects
 
@@ -16,7 +28,7 @@ Furthermore, large parts of its firmware have also been taken from PhobGCC's fir
 
 </details>
 
-<details><summary>Firmware is written in Rust, using the <a href="#">embassy-rs</a> framework for asynchronous operations.</summary>
+<details><summary>Firmware is written in Rust, using the <a href="https://github.com/embassy-rs/embassy">embassy-rs</a> framework for asynchronous operations.</summary>
 
 The firmware being written in Rust allows for writing much cleaner code than one would normally be used to when writing firmware in C, because Rust allows for many zero and low cost abstractions in order to enhance code readability and maintainability. Adding embassy-rs for asynchronous operations on top of that provides 2 main benefits:
 
@@ -27,11 +39,11 @@ The firmware being written in Rust allows for writing much cleaner code than one
 
 <details><summary>Provides both the lowest latency of any Switch controller, as well as the best input integrity.</summary>
 
-Because the NaxGCC connects directly to the console via USB, it already outperforms any controller that has to go through an adapter in terms of input latency (including PhobGCC + Lossless Adapter).
+Because the NaxGCC connects directly to the console via USB, it already outperforms any controller that has to go through an adapter in terms of input latency.
 
-Further, the NaxGCC has a special "input consistency" mode (enabled by default), which ensures a $\gt 98\%$ input accuracy, compared to $\lt 75\%$ for any other controller (worse if there is an adapter in the mix, with the exception of the Lossless Adapter).
+Further, the NaxGCC has a special "input consistency" mode (enabled by default), which ensures a $\gt 98\%$ input accuracy, compared to $\lt 76\%$ for any other controller (worse if there is an adapter in the mix, with the exception of the Lossless Adapter).
 
-For details on how it works, have a look at our wiki.
+For details on how it works, have a look at our [documentation](https://gcc.naxdy.org/).
 
 </details>
 
@@ -43,10 +55,10 @@ The NaxGCC firmware is compatible with regular Phob 2.0 boards (those using an R
 
 ## Contributing
 
-The NaxGCC firmware is built using [nix](), which also provides a ready-to-go development environment, complete with all the tooling and libraries you need to get going. Simply install nix, [enable flakes]() and run
+The NaxGCC firmware is built using [nix](https://nixos.org/download/), which also provides a ready-to-go development environment, complete with all the tooling and libraries you need to get going. Simply install nix, [enable flakes](https://nixos.wiki/wiki/Flakes) and run
 
 ```bash
 nix develop .
 ```
 
-and you're ready to work on the project. Submit your pull requests [here](https://git.naxdy.org/NaxdyOrg/NaxGCC-FW/pulls).
+and you're ready to work on the project. Submit your pull requests [here](https://git.naxdy.org/NaxdyOrg/NaxGCC-FW/pulls). Also be sure to have a look at our [CONTRIBUTING.md](./CONTRIBUTING.md) for more information on how to contribute.

flake.lock

@@ -1,22 +1,5 @@
 {
   "nodes": {
-    "embassy-rs-patched": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1710754402,
-        "narHash": "sha256-HyTw5VQXlSqz9UOq0Dc6G/NWNzQOPXf3PNWffMkfLC4=",
-        "ref": "naxgcc-fw",
-        "rev": "2ee4657727b9679998d941de00b43e1754f570bf",
-        "revCount": 6754,
-        "type": "git",
-        "url": "https://gitea@git.naxdy.org/NaxdyOrg/embassy"
-      },
-      "original": {
-        "ref": "naxgcc-fw",
-        "type": "git",
-        "url": "https://gitea@git.naxdy.org/NaxdyOrg/embassy"
-      }
-    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -35,24 +18,6 @@
         "type": "github"
       }
     },
-    "flake-utils_2": {
-      "inputs": {
-        "systems": "systems_2"
-      },
-      "locked": {
-        "lastModified": 1705309234,
-        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "naersk": {
       "inputs": {
         "nixpkgs": [
@@ -75,27 +40,27 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1710283656,
-        "narHash": "sha256-nI+AOy4uK6jLGBi9nsbHjL1EdSIzoo8oa+9oeVhbyFc=",
+        "lastModified": 1728740863,
+        "narHash": "sha256-u+rxA79a0lyhG+u+oPBRtTDtzz8kvkc9a6SWSt9ekVc=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "51063ed4f2343a59fdeebb279bb81d87d453942b",
+        "rev": "a3f9ad65a0bf298ed5847629a57808b97e6e8077",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-23.11",
+        "ref": "nixos-24.05",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1706487304,
-        "narHash": "sha256-LE8lVX28MV2jWJsidW13D2qrHU/RUUONendL2Q/WlJg=",
+        "lastModified": 1718428119,
+        "narHash": "sha256-WdWDpNaq6u1IPtxtYHHWpl5BmabtpmLnMAx0RdJ/vo8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "90f456026d284c22b3e3497be980b2e47d0b28ac",
+        "rev": "e6cea36f83499eb4e9cd184c8a8e823296b50ad5",
         "type": "github"
       },
       "original": {
@@ -107,7 +72,6 @@
     },
     "root": {
       "inputs": {
-        "embassy-rs-patched": "embassy-rs-patched",
         "flake-utils": "flake-utils",
         "naersk": "naersk",
         "nixpkgs": "nixpkgs",
@@ -116,15 +80,14 @@
     },
     "rust-overlay": {
       "inputs": {
-        "flake-utils": "flake-utils_2",
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1710382258,
-        "narHash": "sha256-2FW1q+o34VBweYQiEkRaSEkNMq3ecrn83VzETeGiVbY=",
+        "lastModified": 1728700003,
+        "narHash": "sha256-Ox1pvEHxLK6lAdaKQW21Zvk65SPDag+cD8YA444R/og=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "8ce81e71ab04a7e906fae62da086d6ee5d6cfc21",
+        "rev": "fc1e58ebabe0cef4442eedea07556ff0c9eafcfe",
         "type": "github"
       },
       "original": {
@@ -147,21 +110,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "systems_2": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",

flake.nix

@@ -2,17 +2,12 @@
   description = "Firmware for the NaxGCC";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-23.11";
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-24.05";
 
     rust-overlay.url = "github:oxalica/rust-overlay";
 
     flake-utils.url = "github:numtide/flake-utils";
 
-    embassy-rs-patched = {
-      url = "git+https://gitea@git.naxdy.org/NaxdyOrg/embassy?ref=naxgcc-fw";
-      flake = false;
-    };
-
     naersk = {
       url = "github:nmattia/naersk";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -25,7 +20,6 @@
     , rust-overlay
     , flake-utils
     , naersk
-    , embassy-rs-patched
     }: (flake-utils.lib.eachDefaultSystem (system:
     let
       pkgs = import nixpkgs {
@@ -51,35 +45,39 @@
       };
 
       CARGO_BUILD_TARGET = "thumbv6m-none-eabi";
-
-      prepCmd = ''
-        mkdir -p lib
-        rm lib/embassy-rs || true
-        ln -s "${embassy-rs-patched}" lib/embassy-rs
-      '';
     in
     {
-      packages.default = self.packages.${system}.naxgcc-fw-uf2;
+      packages = {
+        default = self.packages.${system}.naxgcc-fw-uf2;
 
-      packages.naxgcc-fw-uf2 = pkgs.runCommandLocal "${self.packages.${system}.naxgcc-fw.pname}-uf2-${self.packages.${system}.naxgcc-fw.version}" { } ''
-        mkdir -p $out/bin
-        ${pkgs.elf2uf2-rs}/bin/elf2uf2-rs ${self.packages.${system}.naxgcc-fw}/bin/${self.packages.${system}.naxgcc-fw.pname} $out/bin/${self.packages.${system}.naxgcc-fw.pname}.uf2
-      '';
+        naxgcc-fw-uf2 = pkgs.runCommandLocal "${self.packages.${system}.naxgcc-fw.pname}-uf2-${self.packages.${system}.naxgcc-fw.version}" { } ''
+          mkdir -p $out/bin
+          ${pkgs.elf2uf2-rs}/bin/elf2uf2-rs ${self.packages.${system}.naxgcc-fw}/bin/${self.packages.${system}.naxgcc-fw.pname} $out/bin/${self.packages.${system}.naxgcc-fw.pname}.uf2
+        '';
 
-      packages.naxgcc-fw = naersk_lib.buildPackage {
-        pname = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.name;
-        version = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.version;
+        naxgcc-fw = pkgs.callPackage
+          ({ mode ? "build" }: naersk_lib.buildPackage {
+            pname = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.name;
+            version = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.version;
 
-        prePatch = prepCmd;
+            inherit mode;
 
-        src = self;
+            src = self;
 
-        cargoBuildOptions = _orig: _orig ++ [
-          "--target=${CARGO_BUILD_TARGET}"
-        ];
+            cargoBuildOptions = _orig: _orig ++ [
+              "--target=${CARGO_BUILD_TARGET}"
+            ];
 
-        # if a tree falls in the forest and no one is around to hear it, does it make a sound?
-        DEFMT_LOG = "off";
+            # if a tree falls in the forest and no one is around to hear it, does it make a sound?
+            DEFMT_LOG = "off";
+          })
+          { };
+      };
+
+      checks = {
+        clippy = self.packages.${system}.naxgcc-fw.override {
+          mode = "clippy";
+        };
       };
 
       devShells.default = pkgs.mkShell {
@@ -92,8 +90,6 @@
         DEFMT_LOG = "debug";
 
         inherit CARGO_BUILD_TARGET;
-
-        shellHook = prepCmd;
       };
     }));
 }

src/config.rs

@@ -10,13 +10,14 @@ use embassy_rp::{
     flash::{Async, Flash, ERASE_SIZE},
     peripherals::FLASH,
 };
-use packed_struct::{derive::PackedStruct, PackedStruct};
+use packed_struct::{
+    derive::{PackedStruct, PrimitiveEnum_u8},
+    PackedStruct,
+};
 
 use crate::{
-    gcc_hid::{
-        Buttons1, Buttons2, SIGNAL_CHANGE_RUMBLE_STRENGTH, SIGNAL_INPUT_CONSISTENCY_MODE_STATUS,
-    },
     helpers::{PackedFloat, ToPackedFloatArray, ToRegularArray, XyValuePair},
+    hid::gcc::{GcButtons1, GcButtons2, GcState},
     input::{
         read_ext_adc, Stick, StickAxis, FLOAT_ORIGIN, SPI_ACS_SHARED, SPI_CCS_SHARED, SPI_SHARED,
     },
@@ -25,6 +26,7 @@ use crate::{
         LinearizedCalibration, NotchCalibration, NotchStatus, CALIBRATION_ORDER,
         NOTCH_ADJUSTMENT_ORDER, NO_OF_ADJ_NOTCHES, NO_OF_CALIBRATION_POINTS, NO_OF_NOTCHES,
     },
+    usb_comms::{MUTEX_INPUT_CONSISTENCY_MODE, SIGNAL_CHANGE_RUMBLE_STRENGTH},
     ADDR_OFFSET, FLASH_SIZE,
 };
 
@@ -33,9 +35,9 @@ use embassy_sync::{
     pubsub::Subscriber,
     signal::Signal,
 };
-use embassy_time::{Duration, Ticker, Timer};
+use embassy_time::Timer;
 
-use crate::{gcc_hid::GcReport, input::CHANNEL_GCC_STATE};
+use crate::input::CHANNEL_GCC_STATE;
 
 /// Whether we are currently calibrating the sticks. Updates are dispatched when the status changes.
 /// Initial status is assumed to be false.
@@ -77,7 +79,7 @@ const MAX_ANALOG_SCALER: u8 = 125;
 /// a certain mode.
 #[derive(Default, Debug, Clone, Format)]
 pub struct OverrideGcReportInstruction {
-    pub report: GcReport,
+    pub report: GcState,
     pub duration_ms: u64,
 }
 
@@ -347,6 +349,27 @@ const INPUT_CONSISTENCY_TOGGLE_COMBO: [AwaitableButtons; 4] = [
     AwaitableButtons::Wildcard,
 ];
 
+const DISPLAY_WAVESHAPING_COMBO: [AwaitableButtons; 4] = [
+    AwaitableButtons::L,
+    AwaitableButtons::Start,
+    AwaitableButtons::Wildcard,
+    AwaitableButtons::Wildcard,
+];
+
+const DISPLAY_SMOOTHING_COMBO: [AwaitableButtons; 4] = [
+    AwaitableButtons::R,
+    AwaitableButtons::Start,
+    AwaitableButtons::Wildcard,
+    AwaitableButtons::Wildcard,
+];
+
+const DISPLAY_SNAPBACK_COMBO: [AwaitableButtons; 4] = [
+    AwaitableButtons::Up,
+    AwaitableButtons::Start,
+    AwaitableButtons::Wildcard,
+    AwaitableButtons::Wildcard,
+];
+
 const EXIT_CONFIG_MODE_COMBO: [AwaitableButtons; 4] = [
     AwaitableButtons::A,
     AwaitableButtons::X,
@@ -443,8 +466,10 @@ pub struct OverrideStickState {
     pub which_stick: Stick,
 }
 
+/// Enum button representation mainly used in the calibration process,
+/// in conjunction with `is_awaitable_button_pressed`
 #[allow(dead_code)]
-#[derive(Clone, Copy, Debug, Format)]
+#[derive(Clone, Copy, Debug, Format, PartialEq, Eq)]
 pub enum AwaitableButtons {
     A,
     B,
@@ -458,11 +483,11 @@ pub enum AwaitableButtons {
     L,
     R,
     Z,
-    // special, because Z is used for cstick calibration
+    /// Special, because Z is used for cstick calibration.
     NotZ,
-    /// Used for padding arrays to the correct length.
+    /// Can be used for padding arrays to a fixed length.
     Wildcard,
-    /// Used for disabling certain button combinations.\
+    /// Can be used for disabling certain button combinations.
     Impossible,
 }
 
@@ -523,6 +548,33 @@ impl Default for StickConfig {
     }
 }
 
+#[derive(Debug, Clone, Copy, Format, PrimitiveEnum_u8, PartialEq, Eq)]
+pub enum InputConsistencyMode {
+    /// Transmit inputs every 8ms, same as the original GCC adapter (and any other).
+    Original = 0,
+    /// Forcibly delay transmissions to be 8.33ms apart, to better align with the game's frame rate.
+    ConsistencyHack = 1,
+    /// Transmit inputs _at most_ every 8.33ms, but don't transmit anything at all if the controller state doesn't change.
+    /// This has the potential to drastically improve latency in certain situations, such as when you are waiting to react
+    /// to something your opponent does.
+    /// The name is not meant to imply that this is a hack that is super, but rather that this is super hacky.
+    SuperHack = 2,
+    /// Transmit inputs every 1 ms, for use on PC or other devices that are not garbage.
+    /// This is not recommended for use on the Switch!
+    PC = 3,
+}
+
+/// Not saved, but set upon plugging in the controller.
+#[derive(Debug, Clone, Copy, Format, PrimitiveEnum_u8, PartialEq, Eq)]
+pub enum ControllerMode {
+    /// Advertise itself as a GCC adapter with 1 controller (itself) connected.
+    GcAdapter = 0,
+    /// Pretend to be a Nintendo Switch Pro Controller connected via USB.
+    Procon = 1,
+    /// Act as an XInput device, and also advertise itself with 1000Hz polling capability.
+    XInput = 2,
+}
+
 #[derive(Debug, Clone, Format, PackedStruct)]
 #[packed_struct(endian = "msb")]
 pub struct ControllerConfig {
@@ -532,8 +584,8 @@ pub struct ControllerConfig {
     /// will trick the Switch into updating the state every 8.33ms
     /// instead of every 8ms. The tradeoff is a slight increase in
     /// input lag.
-    #[packed_field(size_bits = "8")]
-    pub input_consistency_mode: bool,
+    #[packed_field(size_bits = "8", ty = "enum")]
+    pub input_consistency_mode: InputConsistencyMode,
     #[packed_field(size_bits = "8")]
     pub rumble_strength: u8,
     #[packed_field(size_bytes = "328")]
@@ -546,7 +598,7 @@ impl Default for ControllerConfig {
     fn default() -> Self {
         Self {
             config_revision: CONTROLLER_CONFIG_REVISION,
-            input_consistency_mode: true,
+            input_consistency_mode: InputConsistencyMode::ConsistencyHack,
             astick_config: StickConfig::default(),
             rumble_strength: 9,
             cstick_config: StickConfig::default(),
@@ -560,12 +612,7 @@ impl ControllerConfig {
     ) -> Result<Self, embassy_rp::flash::Error> {
         let mut controller_config_packed: <ControllerConfig as packed_struct::PackedStruct>::ByteArray = ControllerConfig::default().pack().unwrap();
 
-        let r = flash.blocking_read(ADDR_OFFSET, &mut controller_config_packed);
-
-        if r.is_err() {
-            warn!("Controller config not found in flash, using default.");
-            controller_config_packed = [0u8; 659];
-        }
+        flash.blocking_read(ADDR_OFFSET, &mut controller_config_packed)?;
 
         match ControllerConfig::unpack(&controller_config_packed) {
             Ok(cfg) => match cfg {
@@ -599,40 +646,45 @@ impl ControllerConfig {
     }
 }
 
-trait WaitForButtonPress {
+/// Trait for providing button presses, used in the calibration process.
+trait ButtonPressProvider {
     /// Wait for a single button press.
+    // TODO: remove allow once this is used somewhere
+    #[allow(dead_code)]
     async fn wait_for_button_press(&mut self, button_to_wait_for: &AwaitableButtons);
 
     /// Wait for a single button release.
     async fn wait_for_button_release(&mut self, button_to_wait_for: &AwaitableButtons);
 
-    /// Wait for multiple buttons to be pressed simultaneously.
+    /// Wait for multiple buttons to be pressed simultaneously. Non-exclusive.
     async fn wait_for_simultaneous_button_presses<const N: usize>(
         &mut self,
         buttons_to_wait_for: &[AwaitableButtons; N],
     );
 
-    /// Wait for a single button press of specified buttons, and return the button that was pressed.
+    /// Wait for a single button press of specified buttons, and return the button that was pressed. Non-exclusive.
     async fn wait_and_filter_button_press<const N: usize>(
         &mut self,
         buttons_to_wait_for: &[AwaitableButtons; N],
     ) -> AwaitableButtons;
 
-    /// See if one of the buttons in buttons_to_look_out_for is pressed, and return the pressed button, otherwise None.
+    /// See if one of the buttons in buttons_to_look_out_for is pressed, and return the pressed button, otherwise None. Non-exclusive.
     fn filter_button_press_if_present<const N: usize>(
         &mut self,
         buttons_to_look_out_for: &[AwaitableButtons; N],
     ) -> Option<AwaitableButtons>;
 
     /// Wait for multiple possible button combinations to be pressed simultaneously, and return the index of the combination that was pressed.
+    ///
+    /// Note that this is done non-exclusively, so if the pressed buttons match multiple combinations, the first matching index in the array will be returned.
     async fn wait_and_filter_simultaneous_button_presses<const N: usize, const M: usize>(
         &mut self,
         buttons_to_wait_for: &[[AwaitableButtons; N]; M],
     ) -> usize;
 }
 
-impl<'a, T: RawMutex, const I: usize, const J: usize, const K: usize> WaitForButtonPress
-    for Subscriber<'a, T, GcReport, I, J, K>
+impl<'a, T: RawMutex, const I: usize, const J: usize, const K: usize> ButtonPressProvider
+    for Subscriber<'a, T, GcState, I, J, K>
 {
     async fn wait_for_button_press(&mut self, button_to_wait_for: &AwaitableButtons) {
         loop {
@@ -732,7 +784,7 @@ impl<'a, T: RawMutex, const I: usize, const J: usize, const K: usize> WaitForBut
 }
 
 pub fn is_awaitable_button_pressed(
-    report: &GcReport,
+    report: &GcState,
     button_to_wait_for: &AwaitableButtons,
 ) -> bool {
     match button_to_wait_for {
@@ -846,6 +898,28 @@ impl<'a> StickCalibrationProcess<'a> {
         }
     }
 
+    fn calibration_skip_measurement(&mut self) {
+        self.calibration_step = NO_OF_CALIBRATION_POINTS as u8;
+
+        let stick_config = match self.which_stick {
+            Stick::ControlStick => &mut self.gcc_config.astick_config,
+            Stick::CStick => &mut self.gcc_config.cstick_config,
+        };
+
+        for i in 0..NO_OF_CALIBRATION_POINTS {
+            self.cal_points[i] = XyValuePair {
+                x: *stick_config.cal_points_x[i],
+                y: *stick_config.cal_points_y[i],
+            };
+        }
+
+        self.applied_calibration = AppliedCalibration::from_points(
+            stick_config.cal_points_x.to_regular_array(),
+            stick_config.cal_points_y.to_regular_array(),
+            stick_config,
+        );
+    }
+
     async fn calibration_advance(&mut self) -> bool {
         info!(
             "Running calibration advance on stick {} at step {}",
@@ -952,7 +1026,9 @@ impl<'a> StickCalibrationProcess<'a> {
         let mut gcc_subscriber = CHANNEL_GCC_STATE.subscriber().unwrap();
         SIGNAL_IS_CALIBRATING.signal(true);
 
-        while {
+        let mut done = false;
+
+        while !done {
             if self.calibration_step < NO_OF_CALIBRATION_POINTS as u8 {
                 // Calibration phase
 
@@ -978,9 +1054,14 @@ impl<'a> StickCalibrationProcess<'a> {
                 // Prevent accidental double presses
                 Timer::after_millis(100).await;
 
-                gcc_subscriber
-                    .wait_for_button_press(&AwaitableButtons::A)
+                let btn_result = gcc_subscriber
+                    .wait_and_filter_button_press(&[AwaitableButtons::A, AwaitableButtons::Start])
                     .await;
+
+                if btn_result == AwaitableButtons::Start {
+                    self.calibration_skip_measurement();
+                    continue;
+                }
             } else {
                 // Notch adjustment phase
 
@@ -990,8 +1071,6 @@ impl<'a> StickCalibrationProcess<'a> {
 
                 Timer::after_millis(100).await;
 
-                let mut ticker = Ticker::every(Duration::from_millis(20));
-
                 let notch_idx = NOTCH_ADJUSTMENT_ORDER
                     [self.calibration_step as usize - NO_OF_CALIBRATION_POINTS];
 
@@ -1033,13 +1112,13 @@ impl<'a> StickCalibrationProcess<'a> {
                         None => self.adjust_notch(NotchAdjustmentType::None),
                     };
 
-                    ticker.next().await;
+                    Timer::after_millis(1).await;
                     yield_now().await;
                 }
             };
 
-            !self.calibration_advance().await
-        } {}
+            done = self.calibration_advance().await;
+        }
 
         SIGNAL_IS_CALIBRATING.signal(false);
         SIGNAL_OVERRIDE_STICK_STATE.signal(None);
@@ -1071,7 +1150,7 @@ async fn configuration_main_loop<
 >(
     current_config: &ControllerConfig,
     flash: &mut Flash<'static, FLASH, Async, FLASH_SIZE>,
-    gcc_subscriber: &mut Subscriber<'a, M, GcReport, C, S, P>,
+    gcc_subscriber: &mut Subscriber<'a, M, GcState, C, S, P>,
 ) -> ControllerConfig {
     let mut final_config = current_config.clone();
     let config_options = [
@@ -1116,6 +1195,9 @@ async fn configuration_main_loop<
         RUMBLE_STRENGTH_INCREASE_COMBO,
         RUMBLE_STRENGTH_DECREASE_COMBO,
         INPUT_CONSISTENCY_TOGGLE_COMBO,
+        DISPLAY_WAVESHAPING_COMBO,
+        DISPLAY_SMOOTHING_COMBO,
+        DISPLAY_SNAPBACK_COMBO,
     ];
 
     'main: loop {
@@ -1126,15 +1208,15 @@ async fn configuration_main_loop<
             // exit
             0 => {
                 override_gcc_state_and_wait(&OverrideGcReportInstruction {
-                    report: GcReport {
+                    report: GcState {
                         trigger_r: 255,
                         trigger_l: 255,
-                        buttons_2: Buttons2 {
+                        buttons_2: GcButtons2 {
                             button_r: true,
                             button_l: true,
                             ..Default::default()
                         },
-                        buttons_1: Buttons1 {
+                        buttons_1: GcButtons1 {
                             button_x: true,
                             button_y: true,
                             button_a: true,
@@ -1154,15 +1236,15 @@ async fn configuration_main_loop<
             // calibrate lstick
             1 => {
                 override_gcc_state_and_wait(&OverrideGcReportInstruction {
-                    report: GcReport {
+                    report: GcState {
                         trigger_r: 255,
                         trigger_l: 255,
-                        buttons_2: Buttons2 {
+                        buttons_2: GcButtons2 {
                             button_r: true,
                             button_l: true,
                             ..Default::default()
                         },
-                        buttons_1: Buttons1 {
+                        buttons_1: GcButtons1 {
                             button_x: true,
                             button_y: true,
                             button_a: true,
@@ -1183,15 +1265,15 @@ async fn configuration_main_loop<
             // calibrate rstick
             2 => {
                 override_gcc_state_and_wait(&OverrideGcReportInstruction {
-                    report: GcReport {
+                    report: GcState {
                         trigger_r: 255,
                         trigger_l: 255,
-                        buttons_2: Buttons2 {
+                        buttons_2: GcButtons2 {
                             button_r: true,
                             button_l: true,
                             ..Default::default()
                         },
-                        buttons_1: Buttons1 {
+                        buttons_1: GcButtons1 {
                             button_x: true,
                             button_y: true,
                             button_a: true,
@@ -1242,15 +1324,15 @@ async fn configuration_main_loop<
                 .clamp(-ABS_MAX_SNAPBACK, ABS_MAX_SNAPBACK);
 
                 override_gcc_state_and_wait(&OverrideGcReportInstruction {
-                    report: GcReport {
+                    report: GcState {
                         trigger_r: 255,
                         trigger_l: 255,
-                        buttons_2: Buttons2 {
+                        buttons_2: GcButtons2 {
                             button_r: true,
                             button_l: true,
                             ..Default::default()
                         },
-                        buttons_1: Buttons1 {
+                        buttons_1: GcButtons1 {
                             button_x: true,
                             button_y: true,
                             button_a: true,
@@ -1328,15 +1410,15 @@ async fn configuration_main_loop<
                 .clamp(0, MAX_WAVESHAPING) as u8;
 
                 override_gcc_state_and_wait(&OverrideGcReportInstruction {
-                    report: GcReport {
+                    report: GcState {
                         trigger_r: 255,
                         trigger_l: 255,
-                        buttons_2: Buttons2 {
+                        buttons_2: GcButtons2 {
                             button_r: true,
                             button_l: true,
                             ..Default::default()
                         },
-                        buttons_1: Buttons1 {
+                        buttons_1: GcButtons1 {
                             button_x: true,
                             button_y: true,
                             button_a: true,
@@ -1414,15 +1496,15 @@ async fn configuration_main_loop<
                 .clamp(0, MAX_SMOOTHING) as u8;
 
                 override_gcc_state_and_wait(&OverrideGcReportInstruction {
-                    report: GcReport {
+                    report: GcState {
                         trigger_r: 255,
                         trigger_l: 255,
-                        buttons_2: Buttons2 {
+                        buttons_2: GcButtons2 {
                             button_r: true,
                             button_l: true,
                             ..Default::default()
                         },
-                        buttons_1: Buttons1 {
+                        buttons_1: GcButtons1 {
                             button_x: true,
                             button_y: true,
                             button_a: true,
@@ -1489,15 +1571,15 @@ async fn configuration_main_loop<
                 .clamp(-1, MAX_CARDINAL_SNAP);
 
                 override_gcc_state_and_wait(&OverrideGcReportInstruction {
-                    report: GcReport {
+                    report: GcState {
                         trigger_r: 255,
                         trigger_l: 255,
-                        buttons_2: Buttons2 {
+                        buttons_2: GcButtons2 {
                             button_r: true,
                             button_l: true,
                             ..Default::default()
                         },
-                        buttons_1: Buttons1 {
+                        buttons_1: GcButtons1 {
                             button_x: true,
                             button_y: true,
                             button_a: true,
@@ -1545,15 +1627,15 @@ async fn configuration_main_loop<
                     as u8;
 
                 override_gcc_state_and_wait(&OverrideGcReportInstruction {
-                    report: GcReport {
+                    report: GcState {
                         trigger_r: 255,
                         trigger_l: 255,
-                        buttons_2: Buttons2 {
+                        buttons_2: GcButtons2 {
                             button_r: true,
                             button_l: true,
                             ..Default::default()
                         },
-                        buttons_1: Buttons1 {
+                        buttons_1: GcButtons1 {
                             button_x: true,
                             button_y: true,
                             button_a: true,
@@ -1593,23 +1675,23 @@ async fn configuration_main_loop<
                 SIGNAL_CHANGE_RUMBLE_STRENGTH.signal(*to_adjust);
 
                 override_gcc_state_and_wait(&OverrideGcReportInstruction {
-                    report: GcReport {
+                    report: GcState {
                         trigger_r: 255,
                         trigger_l: 255,
-                        buttons_2: Buttons2 {
+                        buttons_2: GcButtons2 {
                             button_r: true,
                             button_l: true,
                             button_z: true,
                             ..Default::default()
                         },
-                        buttons_1: Buttons1 {
+                        buttons_1: GcButtons1 {
                             button_x: true,
                             button_y: true,
                             button_a: true,
                             ..Default::default()
                         },
                         stick_x: 127,
-                        stick_y: 127,
+                        stick_y: 127 + *to_adjust,
                         cstick_x: 127,
                         cstick_y: 127,
                     },
@@ -1621,18 +1703,23 @@ async fn configuration_main_loop<
             }
             // input consistency toggle
             37 => {
-                final_config.input_consistency_mode = !final_config.input_consistency_mode;
+                final_config.input_consistency_mode = match final_config.input_consistency_mode {
+                    InputConsistencyMode::Original => InputConsistencyMode::PC,
+                    InputConsistencyMode::PC => InputConsistencyMode::ConsistencyHack,
+                    InputConsistencyMode::ConsistencyHack => InputConsistencyMode::SuperHack,
+                    InputConsistencyMode::SuperHack => InputConsistencyMode::Original,
+                };
 
                 override_gcc_state_and_wait(&OverrideGcReportInstruction {
-                    report: GcReport {
+                    report: GcState {
                         trigger_r: 255,
                         trigger_l: 255,
-                        buttons_2: Buttons2 {
+                        buttons_2: GcButtons2 {
                             button_r: true,
                             button_l: true,
                             ..Default::default()
                         },
-                        buttons_1: Buttons1 {
+                        buttons_1: GcButtons1 {
                             button_x: true,
                             button_y: true,
                             button_a: true,
@@ -1641,8 +1728,10 @@ async fn configuration_main_loop<
                         stick_x: 127,
                         stick_y: (127_i8
                             + match final_config.input_consistency_mode {
-                                true => 69,
-                                false => -69,
+                                InputConsistencyMode::Original => -69,
+                                InputConsistencyMode::PC => -42,
+                                InputConsistencyMode::ConsistencyHack => 42,
+                                InputConsistencyMode::SuperHack => 69,
                             }) as u8,
                         cstick_x: 127,
                         cstick_y: 127,
@@ -1653,6 +1742,84 @@ async fn configuration_main_loop<
 
                 SIGNAL_CONFIG_CHANGE.signal(final_config.clone());
             }
+            // display waveshaping values on both sticks
+            38 => {
+                override_gcc_state_and_wait(&OverrideGcReportInstruction {
+                    report: GcState {
+                        trigger_r: 255,
+                        trigger_l: 255,
+                        buttons_2: GcButtons2 {
+                            button_r: true,
+                            button_l: true,
+                            ..Default::default()
+                        },
+                        buttons_1: GcButtons1 {
+                            button_x: true,
+                            button_y: true,
+                            button_a: true,
+                            ..Default::default()
+                        },
+                        stick_x: 127 + final_config.astick_config.x_waveshaping,
+                        stick_y: 127 + final_config.astick_config.y_waveshaping,
+                        cstick_x: 127 + final_config.cstick_config.x_waveshaping,
+                        cstick_y: 127 + final_config.cstick_config.y_waveshaping,
+                    },
+                    duration_ms: 1000,
+                })
+                .await;
+            }
+            // display stick smoothing values on both sticks
+            39 => {
+                override_gcc_state_and_wait(&OverrideGcReportInstruction {
+                    report: GcState {
+                        trigger_r: 255,
+                        trigger_l: 255,
+                        buttons_2: GcButtons2 {
+                            button_r: true,
+                            button_l: true,
+                            ..Default::default()
+                        },
+                        buttons_1: GcButtons1 {
+                            button_x: true,
+                            button_y: true,
+                            button_a: true,
+                            ..Default::default()
+                        },
+                        stick_x: 127 + final_config.astick_config.x_smoothing,
+                        stick_y: 127 + final_config.astick_config.y_smoothing,
+                        cstick_x: 127 + final_config.cstick_config.x_smoothing,
+                        cstick_y: 127 + final_config.cstick_config.y_smoothing,
+                    },
+                    duration_ms: 1000,
+                })
+                .await;
+            }
+            // display snapback values on both sticks
+            40 => {
+                override_gcc_state_and_wait(&OverrideGcReportInstruction {
+                    report: GcState {
+                        trigger_r: 255,
+                        trigger_l: 255,
+                        buttons_2: GcButtons2 {
+                            button_r: true,
+                            button_l: true,
+                            ..Default::default()
+                        },
+                        buttons_1: GcButtons1 {
+                            button_x: true,
+                            button_y: true,
+                            button_a: true,
+                            ..Default::default()
+                        },
+                        stick_x: (127 + final_config.astick_config.x_snapback) as u8,
+                        stick_y: (127 + final_config.astick_config.y_snapback) as u8,
+                        cstick_x: (127 + final_config.cstick_config.x_snapback) as u8,
+                        cstick_y: (127 + final_config.cstick_config.y_snapback) as u8,
+                    },
+                    duration_ms: 1000,
+                })
+                .await;
+            }
             s => {
                 error!("Invalid selection in config loop: {}", s);
                 continue;
@@ -1682,7 +1849,11 @@ pub async fn config_task(mut flash: Flash<'static, FLASH, Async, FLASH_SIZE>) {
 
     let mut current_config = ControllerConfig::from_flash_memory(&mut flash).unwrap();
 
-    SIGNAL_INPUT_CONSISTENCY_MODE_STATUS.signal(current_config.input_consistency_mode);
+    {
+        let mut m_input_consistency = MUTEX_INPUT_CONSISTENCY_MODE.lock().await;
+        *m_input_consistency = Some(current_config.input_consistency_mode);
+    }
+
     SIGNAL_CHANGE_RUMBLE_STRENGTH.signal(current_config.rumble_strength);
     SIGNAL_CONFIG_CHANGE.signal(current_config.clone());
 
@@ -1697,15 +1868,15 @@ pub async fn config_task(mut flash: Flash<'static, FLASH, Async, FLASH_SIZE>) {
         info!("Entering config mode.");
 
         override_gcc_state_and_wait(&OverrideGcReportInstruction {
-            report: GcReport {
+            report: GcState {
                 trigger_r: 255,
                 trigger_l: 255,
-                buttons_2: Buttons2 {
+                buttons_2: GcButtons2 {
                     button_l: true,
                     button_r: true,
                     ..Default::default()
                 },
-                buttons_1: Buttons1 {
+                buttons_1: GcButtons1 {
                     button_x: true,
                     button_y: true,
                     button_a: true,

src/filter.rs

@@ -179,7 +179,7 @@ pub struct KalmanState {
 }
 
 impl KalmanState {
-    // runs kalman filter
+    #[inline(never)]
     #[link_section = ".time_critical.run_kalman"]
     pub fn run_kalman(
         &mut self,
@@ -292,6 +292,7 @@ impl KalmanState {
 ///  output at the rim longer when released.
 ///
 /// Output is a tuple of the x and y positions.
+#[inline(never)]
 #[link_section = ".time_critical.run_waveshaping"]
 pub fn run_waveshaping(
     x_pos: f32,

src/gcc_hid.rs

@@ -1,478 +0,0 @@
-/**
- * Communication with the console / PC over USB HID.
- * Includes the HID report descriptor, and the GcReport struct.
- */
-use core::default::Default;
-
-use defmt::{debug, info, trace, warn, Format};
-use embassy_futures::join::join;
-use embassy_rp::{
-    peripherals::{PIN_25, PIN_29, PWM_CH4, PWM_CH6, USB},
-    pwm::Pwm,
-    usb::Driver,
-};
-
-use embassy_sync::{blocking_mutex::raw::CriticalSectionRawMutex, signal::Signal};
-use embassy_time::{Duration, Instant, Ticker};
-use embassy_usb::{
-    class::hid::{HidReaderWriter, ReportId, RequestHandler, State},
-    control::OutResponse,
-    Builder, Handler,
-};
-use libm::powf;
-use packed_struct::{derive::PackedStruct, PackedStruct};
-
-use crate::input::CHANNEL_GCC_STATE;
-
-static SIGNAL_RUMBLE: Signal<CriticalSectionRawMutex, bool> = Signal::new();
-
-/// We could turn the config change signal into a PubSubChannel instead, but that
-/// would just transmit unnecessary amounts of data.
-pub static SIGNAL_CHANGE_RUMBLE_STRENGTH: Signal<CriticalSectionRawMutex, u8> = Signal::new();
-
-/// Only dispatched ONCE after powerup, to determine how to advertise itself via USB.
-pub static SIGNAL_INPUT_CONSISTENCY_MODE_STATUS: Signal<CriticalSectionRawMutex, bool> =
-    Signal::new();
-
-#[rustfmt::skip]
-pub const GCC_REPORT_DESCRIPTOR: &[u8] = &[
-    0x05, 0x01,        // Usage Page (Generic Desktop Ctrls)
-    0x09, 0x05,        // Usage (Game Pad)
-    0xA1, 0x01,        // Collection (Application)
-    0xA1, 0x03,        //   Collection (Report)
-    0x85, 0x11,        //     Report ID (17)
-    0x19, 0x00,        //     Usage Minimum (Undefined)
-    0x2A, 0xFF, 0x00,  //     Usage Maximum (0xFF)
-    0x15, 0x00,        //     Logical Minimum (0)
-    0x26, 0xFF, 0x00,  //     Logical Maximum (255)
-    0x75, 0x08,        //     Report Size (8)
-    0x95, 0x05,        //     Report Count (5)
-    0x91, 0x00,        //     Output (Data,Array,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
-    0xC0,              //   End Collection
-    0xA1, 0x03,        //   Collection (Report)
-    0x85, 0x21,        //     Report ID (33)
-    0x05, 0x00,        //     Usage Page (Undefined)
-    0x15, 0x00,        //     Logical Minimum (0)
-    0x25, 0xFF,        //     Logical Maximum (-1)
-    0x75, 0x08,        //     Report Size (8)
-    0x95, 0x01,        //     Report Count (1)
-    0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
-    0x05, 0x09,        //     Usage Page (Button)
-    0x19, 0x01,        //     Usage Minimum (0x01)
-    0x29, 0x08,        //     Usage Maximum (0x08)
-    0x15, 0x00,        //     Logical Minimum (0)
-    0x25, 0x01,        //     Logical Maximum (1)
-    0x75, 0x08,        //     Report Size (8)
-    0x95, 0x02,        //     Report Count (2)
-    0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
-    0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
-    0x09, 0x30,        //     Usage (X)
-    0x09, 0x31,        //     Usage (Y)
-    0x09, 0x32,        //     Usage (Z)
-    0x09, 0x33,        //     Usage (Rx)
-    0x09, 0x34,        //     Usage (Ry)
-    0x09, 0x35,        //     Usage (Rz)
-    0x15, 0x81,        //     Logical Minimum (-127)
-    0x25, 0x7F,        //     Logical Maximum (127)
-    0x75, 0x08,        //     Report Size (8)
-    0x95, 0x06,        //     Report Count (6)
-    0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
-    0xC0,              //   End Collection
-    0xA1, 0x03,        //   Collection (Report)
-    0x85, 0x13,        //     Report ID (19)
-    0x19, 0x00,        //     Usage Minimum (Undefined)
-    0x2A, 0xFF, 0x00,  //     Usage Maximum (0xFF)
-    0x15, 0x00,        //     Logical Minimum (0)
-    0x26, 0xFF, 0x00,  //     Logical Maximum (255)
-    0x75, 0x08,        //     Report Size (8)
-    0x95, 0x01,        //     Report Count (1)
-    0x91, 0x00,        //     Output (Data,Array,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
-    0xC0,              //   End Collection
-    0xC0,              // End Collection
-];
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
-#[packed_struct(bit_numbering = "lsb0", size_bytes = "1")]
-pub struct Buttons1 {
-    #[packed_field(bits = "0")]
-    pub button_a: bool,
-    #[packed_field(bits = "1")]
-    pub button_b: bool,
-    #[packed_field(bits = "2")]
-    pub button_x: bool,
-    #[packed_field(bits = "3")]
-    pub button_y: bool,
-    #[packed_field(bits = "4")]
-    pub dpad_left: bool,
-    #[packed_field(bits = "5")]
-    pub dpad_right: bool,
-    #[packed_field(bits = "6")]
-    pub dpad_down: bool,
-    #[packed_field(bits = "7")]
-    pub dpad_up: bool,
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
-#[packed_struct(bit_numbering = "lsb0", size_bytes = "1")]
-pub struct Buttons2 {
-    #[packed_field(bits = "0")]
-    pub button_start: bool,
-    #[packed_field(bits = "1")]
-    pub button_z: bool,
-    #[packed_field(bits = "2")]
-    pub button_r: bool,
-    #[packed_field(bits = "3")]
-    pub button_l: bool,
-    #[packed_field(bits = "4..=7")]
-    pub blank1: u8,
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, PackedStruct, Format)]
-#[packed_struct(bit_numbering = "msb0", size_bytes = "8")]
-pub struct GcReport {
-    #[packed_field(bits = "0..=7")]
-    pub buttons_1: Buttons1,
-    #[packed_field(bits = "8..=15")]
-    pub buttons_2: Buttons2,
-    #[packed_field(bits = "16..=23")]
-    pub stick_x: u8,
-    #[packed_field(bits = "24..=31")]
-    pub stick_y: u8,
-    #[packed_field(bits = "32..=39")]
-    pub cstick_x: u8,
-    #[packed_field(bits = "40..=47")]
-    pub cstick_y: u8,
-    #[packed_field(bits = "48..=55")]
-    pub trigger_l: u8,
-    #[packed_field(bits = "56..=63")]
-    pub trigger_r: u8,
-}
-
-impl Default for GcReport {
-    fn default() -> Self {
-        Self {
-            buttons_1: Buttons1::default(),
-            buttons_2: Buttons2::default(),
-            stick_x: 127,
-            stick_y: 127,
-            cstick_x: 127,
-            cstick_y: 127,
-            trigger_l: 0,
-            trigger_r: 0,
-        }
-    }
-}
-
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
-#[repr(C, align(8))]
-pub struct RawConsoleReport {
-    pub packet: [u8; 64],
-}
-
-impl Default for RawConsoleReport {
-    fn default() -> Self {
-        Self { packet: [0u8; 64] }
-    }
-}
-
-struct GccRequestHandler {}
-
-impl RequestHandler for GccRequestHandler {
-    fn get_report(&self, id: ReportId, _buf: &mut [u8]) -> Option<usize> {
-        info!("Get report for {:?}", id);
-        None
-    }
-
-    fn set_report(&self, id: ReportId, data: &[u8]) -> OutResponse {
-        info!("Set report for {:?}: {=[u8]}", id, data);
-        OutResponse::Accepted
-    }
-
-    fn set_idle_ms(&self, id: Option<ReportId>, dur: u32) {
-        info!("Set idle rate for {:?} to {:?}", id, dur);
-    }
-
-    fn get_idle_ms(&self, id: Option<ReportId>) -> Option<u32> {
-        info!("Get idle rate for {:?}", id);
-        None
-    }
-}
-
-fn get_gcinput_hid_report(input_state: &GcReport) -> [u8; 37] {
-    static mut GC_FIRST: bool = false;
-
-    let mut buffer = [0u8; 37];
-
-    buffer[0] = 0x21;
-    buffer[1] |= 0x14;
-
-    let data = input_state.pack().expect("Failed to pack GC input data");
-
-    if unsafe { !GC_FIRST } {
-        buffer[1] |= 0x04;
-        buffer[10] |= 0x04;
-        buffer[19] |= 0x04;
-        buffer[28] |= 0x04;
-        unsafe { GC_FIRST = true };
-    } else {
-        // controller in "port 1"
-        buffer[2..=9].copy_from_slice(&data[0..=7]);
-    }
-
-    buffer
-}
-
-struct MyDeviceHandler {
-    configured: bool,
-}
-
-impl MyDeviceHandler {
-    fn new() -> Self {
-        MyDeviceHandler { configured: false }
-    }
-}
-
-impl Handler for MyDeviceHandler {
-    fn enabled(&mut self, enabled: bool) {
-        self.configured = true;
-        if enabled {
-            info!("Device enabled");
-        } else {
-            info!("Device disabled");
-        }
-    }
-
-    fn reset(&mut self) {
-        self.configured = false;
-        info!("Bus reset, the Vbus current limit is 100mA");
-    }
-
-    fn addressed(&mut self, addr: u8) {
-        self.configured = false;
-        info!("USB address set to: {}", addr);
-    }
-
-    fn configured(&mut self, configured: bool) {
-        self.configured = configured;
-        if configured {
-            info!(
-                "Device configured, it may now draw up to the configured current limit from Vbus."
-            )
-        } else {
-            info!("Device is no longer configured, the Vbus current limit is 100mA.");
-        }
-    }
-}
-
-#[embassy_executor::task]
-pub async fn usb_transfer_task(raw_serial: [u8; 8], driver: Driver<'static, USB>) {
-    let input_consistency_mode = SIGNAL_INPUT_CONSISTENCY_MODE_STATUS.wait().await;
-
-    let mut serial_buffer = [0u8; 64];
-
-    let serial = format_no_std::show(
-        &mut serial_buffer,
-        format_args!(
-            "{:02X}{:02X}{:02X}{:02X}{:02X}{:02X}{:02X}{:02X}",
-            raw_serial[0],
-            raw_serial[1],
-            raw_serial[2],
-            raw_serial[3],
-            raw_serial[4],
-            raw_serial[5],
-            raw_serial[6],
-            raw_serial[7]
-        ),
-    )
-    .unwrap();
-
-    info!("Detected flash with unique serial number {}", serial);
-
-    trace!("Start of config");
-    let mut usb_config = embassy_usb::Config::new(0x057e, 0x0337);
-    usb_config.manufacturer = Some("Naxdy");
-    usb_config.product = Some(if input_consistency_mode {
-        "NaxGCC (Consistency Mode)"
-    } else {
-        "NaxGCC (OG Mode)"
-    });
-    usb_config.serial_number = Some(serial);
-    usb_config.max_power = 200;
-    usb_config.max_packet_size_0 = 64;
-    usb_config.device_class = 0;
-    usb_config.device_protocol = 0;
-    usb_config.self_powered = false;
-    usb_config.device_sub_class = 0;
-    usb_config.supports_remote_wakeup = true;
-
-    let mut device_descriptor = [0; 256];
-    let mut config_descriptor = [0; 256];
-    let mut bos_descriptor = [0; 256];
-    let mut msos_descriptor = [0; 256];
-    let mut control_buf = [0; 64];
-
-    let request_handler = GccRequestHandler {};
-    let mut device_handler = MyDeviceHandler::new();
-
-    let mut state = State::new();
-
-    let mut builder = Builder::new(
-        driver,
-        usb_config,
-        &mut device_descriptor,
-        &mut config_descriptor,
-        &mut bos_descriptor,
-        &mut msos_descriptor,
-        &mut control_buf,
-    );
-
-    builder.handler(&mut device_handler);
-
-    let hid_config = embassy_usb::class::hid::Config {
-        report_descriptor: GCC_REPORT_DESCRIPTOR,
-        request_handler: Some(&request_handler),
-        poll_ms: if input_consistency_mode { 4 } else { 8 },
-        max_packet_size_in: 37,
-        max_packet_size_out: 5,
-    };
-    let hid = HidReaderWriter::<_, 5, 37>::new(&mut builder, &mut state, hid_config);
-
-    let mut usb = builder.build();
-
-    let usb_fut = async {
-        loop {
-            usb.run_until_suspend().await;
-            debug!("Suspended");
-            usb.wait_resume().await;
-            debug!("RESUMED!");
-        }
-    };
-
-    let (mut reader, mut writer) = hid.split();
-
-    let mut lasttime = Instant::now();
-
-    let in_fut = async {
-        let mut gcc_subscriber = CHANNEL_GCC_STATE.subscriber().unwrap();
-
-        let mut ticker = Ticker::every(Duration::from_micros(8333));
-
-        loop {
-            if input_consistency_mode {
-                // This is what we like to call a "hack".
-                // It forces reports to be sent every 8.33ms instead of every 8ms.
-                // 8.33ms is a multiple of the game's frame interval (16.66ms), so if we
-                // send a report every 8.33ms, it should (in theory) ensure (close to)
-                // 100% input accuracy.
-                //
-                // From the console's perspective, we are basically a laggy adapter, taking
-                // a minimum of 333 extra us to send a report every time it's polled, but it
-                // works to our advantage.
-                ticker.next().await;
-            }
-
-            match writer
-                .write(&{
-                    let state = gcc_subscriber.next_message_pure().await;
-                    let report = get_gcinput_hid_report(&state);
-                    trace!("Report Written: {:08b}", report);
-                    report
-                })
-                .await
-            {
-                Ok(()) => {
-                    let currtime = Instant::now();
-                    let polltime = currtime.duration_since(lasttime);
-                    let micros = polltime.as_micros();
-                    trace!("Report written in {}us", micros);
-                    // If we're sending reports too fast, reset the ticker.
-                    // This might happen right after plug-in, or after suspend.
-                    if micros < 8150 {
-                        ticker.reset();
-                    }
-                    lasttime = currtime;
-                }
-                Err(e) => warn!("Failed to send report: {:?}", e),
-            }
-        }
-    };
-
-    let out_fut = async {
-        loop {
-            trace!("Readery loop");
-            let mut buf = [0u8; 5];
-            match reader.read(&mut buf).await {
-                Ok(_e) => {
-                    debug!("READ SOMETHIN: {:08b}", buf);
-                    SIGNAL_RUMBLE.signal((buf[1] & 0x01) != 0);
-                }
-                Err(e) => {
-                    warn!("Failed to read: {:?}", e);
-                }
-            }
-        }
-    };
-
-    let usb_fut_wrapped = async {
-        usb_fut.await;
-        debug!("USB FUT DED");
-    };
-
-    join(usb_fut_wrapped, join(in_fut, out_fut)).await;
-}
-
-fn calc_rumble_power(strength: u8) -> u16 {
-    if strength > 0 {
-        powf(2.0, 7.0 + ((strength as f32 - 3.0) / 8.0)) as u16
-    } else {
-        0
-    }
-}
-
-#[embassy_executor::task]
-pub async fn rumble_task(
-    pin_rumble: PIN_25,
-    pin_brake: PIN_29,
-    pwm_ch_rumble: PWM_CH4,
-    pwm_ch_brake: PWM_CH6,
-) {
-    let mut rumble_config: embassy_rp::pwm::Config = Default::default();
-    rumble_config.top = 255;
-    rumble_config.enable = true;
-    rumble_config.compare_b = 0;
-
-    let mut brake_config = rumble_config.clone();
-    brake_config.compare_b = 255;
-
-    let mut pwm_rumble = Pwm::new_output_b(pwm_ch_rumble, pin_rumble, rumble_config.clone());
-    let mut pwm_brake = Pwm::new_output_b(pwm_ch_brake, pin_brake, brake_config.clone());
-
-    let mut rumble_power = {
-        let strength = SIGNAL_CHANGE_RUMBLE_STRENGTH.wait().await;
-        calc_rumble_power(strength)
-    };
-
-    loop {
-        let new_rumble_status = SIGNAL_RUMBLE.wait().await;
-
-        debug!("Received rumble signal: {}", new_rumble_status);
-
-        if let Some(new_strength) = SIGNAL_CHANGE_RUMBLE_STRENGTH.try_take() {
-            rumble_power = calc_rumble_power(new_strength);
-        }
-
-        if new_rumble_status {
-            rumble_config.compare_b = rumble_power;
-            brake_config.compare_b = 0;
-
-            pwm_rumble.set_config(&rumble_config);
-            pwm_brake.set_config(&brake_config);
-        } else {
-            rumble_config.compare_b = 0;
-            brake_config.compare_b = 255;
-
-            pwm_rumble.set_config(&rumble_config);
-            pwm_brake.set_config(&brake_config);
-        }
-    }
-}

src/hid/gcc.rs

@@ -0,0 +1,198 @@
+use defmt::{info, trace, Format};
+use embassy_usb::{
+    class::hid::{ReportId, RequestHandler},
+    control::OutResponse,
+};
+
+use crate::usb_comms::{HidReportBuilder, SIGNAL_RUMBLE};
+use packed_struct::{derive::PackedStruct, PackedStruct};
+
+#[rustfmt::skip]
+pub const GCC_REPORT_DESCRIPTOR: &[u8] = &[
+    0x05, 0x01,        // Usage Page (Generic Desktop Ctrls)
+    0x09, 0x05,        // Usage (Game Pad)
+    0xA1, 0x01,        // Collection (Application)
+    0xA1, 0x03,        //   Collection (Report)
+    0x85, 0x11,        //     Report ID (17)
+    0x19, 0x00,        //     Usage Minimum (Undefined)
+    0x2A, 0xFF, 0x00,  //     Usage Maximum (0xFF)
+    0x15, 0x00,        //     Logical Minimum (0)
+    0x26, 0xFF, 0x00,  //     Logical Maximum (255)
+    0x75, 0x08,        //     Report Size (8)
+    0x95, 0x05,        //     Report Count (5)
+    0x91, 0x00,        //     Output (Data,Array,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
+    0xC0,              //   End Collection
+    0xA1, 0x03,        //   Collection (Report)
+    0x85, 0x21,        //     Report ID (33)
+    0x05, 0x00,        //     Usage Page (Undefined)
+    0x15, 0x00,        //     Logical Minimum (0)
+    0x25, 0xFF,        //     Logical Maximum (-1)
+    0x75, 0x08,        //     Report Size (8)
+    0x95, 0x01,        //     Report Count (1)
+    0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+    0x05, 0x09,        //     Usage Page (Button)
+    0x19, 0x01,        //     Usage Minimum (0x01)
+    0x29, 0x08,        //     Usage Maximum (0x08)
+    0x15, 0x00,        //     Logical Minimum (0)
+    0x25, 0x01,        //     Logical Maximum (1)
+    0x75, 0x08,        //     Report Size (8)
+    0x95, 0x02,        //     Report Count (2)
+    0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+    0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
+    0x09, 0x30,        //     Usage (X)
+    0x09, 0x31,        //     Usage (Y)
+    0x09, 0x32,        //     Usage (Z)
+    0x09, 0x33,        //     Usage (Rx)
+    0x09, 0x34,        //     Usage (Ry)
+    0x09, 0x35,        //     Usage (Rz)
+    0x15, 0x81,        //     Logical Minimum (-127)
+    0x25, 0x7F,        //     Logical Maximum (127)
+    0x75, 0x08,        //     Report Size (8)
+    0x95, 0x06,        //     Report Count (6)
+    0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+    0xC0,              //   End Collection
+    0xA1, 0x03,        //   Collection (Report)
+    0x85, 0x13,        //     Report ID (19)
+    0x19, 0x00,        //     Usage Minimum (Undefined)
+    0x2A, 0xFF, 0x00,  //     Usage Maximum (0xFF)
+    0x15, 0x00,        //     Logical Minimum (0)
+    0x26, 0xFF, 0x00,  //     Logical Maximum (255)
+    0x75, 0x08,        //     Report Size (8)
+    0x95, 0x01,        //     Report Count (1)
+    0x91, 0x00,        //     Output (Data,Array,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
+    0xC0,              //   End Collection
+    0xC0,              // End Collection
+];
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "lsb0", size_bytes = "1")]
+pub struct GcButtons1 {
+    #[packed_field(bits = "0")]
+    pub button_a: bool,
+    #[packed_field(bits = "1")]
+    pub button_b: bool,
+    #[packed_field(bits = "2")]
+    pub button_x: bool,
+    #[packed_field(bits = "3")]
+    pub button_y: bool,
+    #[packed_field(bits = "4")]
+    pub dpad_left: bool,
+    #[packed_field(bits = "5")]
+    pub dpad_right: bool,
+    #[packed_field(bits = "6")]
+    pub dpad_down: bool,
+    #[packed_field(bits = "7")]
+    pub dpad_up: bool,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "lsb0", size_bytes = "1")]
+pub struct GcButtons2 {
+    #[packed_field(bits = "0")]
+    pub button_start: bool,
+    #[packed_field(bits = "1")]
+    pub button_z: bool,
+    #[packed_field(bits = "2")]
+    pub button_r: bool,
+    #[packed_field(bits = "3")]
+    pub button_l: bool,
+    #[packed_field(bits = "4..=7")]
+    pub blank1: u8,
+}
+
+///
+/// Struct representing the controller state. Used for HID communications in
+/// GCC adapter mode, as well as for the internal representation of the controller.
+///
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "msb0", size_bytes = "8")]
+pub struct GcState {
+    #[packed_field(bits = "0..=7")]
+    pub buttons_1: GcButtons1,
+    #[packed_field(bits = "8..=15")]
+    pub buttons_2: GcButtons2,
+    #[packed_field(bits = "16..=23")]
+    pub stick_x: u8,
+    #[packed_field(bits = "24..=31")]
+    pub stick_y: u8,
+    #[packed_field(bits = "32..=39")]
+    pub cstick_x: u8,
+    #[packed_field(bits = "40..=47")]
+    pub cstick_y: u8,
+    #[packed_field(bits = "48..=55")]
+    pub trigger_l: u8,
+    #[packed_field(bits = "56..=63")]
+    pub trigger_r: u8,
+}
+
+impl Default for GcState {
+    fn default() -> Self {
+        Self {
+            buttons_1: GcButtons1::default(),
+            buttons_2: GcButtons2::default(),
+            stick_x: 127,
+            stick_y: 127,
+            cstick_x: 127,
+            cstick_y: 127,
+            trigger_l: 0,
+            trigger_r: 0,
+        }
+    }
+}
+
+#[derive(Default)]
+pub struct GcReportBuilder {
+    gc_first: bool,
+}
+
+impl HidReportBuilder<37> for GcReportBuilder {
+    async fn get_hid_report(&mut self, state: &GcState) -> [u8; 37] {
+        let mut buffer = [0u8; 37];
+
+        buffer[0] = 0x21;
+        buffer[1] |= 0x14;
+
+        let data = state.pack().expect("Failed to pack GC input data");
+
+        if !self.gc_first {
+            buffer[1] |= 0x04;
+            buffer[10] |= 0x04;
+            buffer[19] |= 0x04;
+            buffer[28] |= 0x04;
+            self.gc_first = true;
+        } else {
+            // controller in "port 1"
+            buffer[2..=9].copy_from_slice(&data);
+        }
+
+        buffer
+    }
+}
+
+pub struct GccRequestHandler;
+
+impl RequestHandler for GccRequestHandler {
+    fn get_report(&mut self, id: ReportId, _buf: &mut [u8]) -> Option<usize> {
+        info!("Get report for {:?}", id);
+        None
+    }
+
+    fn set_report(&mut self, id: ReportId, data: &[u8]) -> OutResponse {
+        trace!("Set report for {:?}: {:x}", id, data);
+
+        if data.len() > 1 {
+            SIGNAL_RUMBLE.signal((data[1] & 0x01) != 0);
+        }
+
+        OutResponse::Accepted
+    }
+
+    fn set_idle_ms(&mut self, id: Option<ReportId>, dur: u32) {
+        info!("Set idle rate for {:?} to {:?}", id, dur);
+    }
+
+    fn get_idle_ms(&mut self, id: Option<ReportId>) -> Option<u32> {
+        info!("Get idle rate for {:?}", id);
+        None
+    }
+}

src/hid/mod.rs

@@ -0,0 +1,70 @@
+use embassy_usb::{
+    class::hid::{HidReader, HidReaderWriter, HidWriter, ReadError, RequestHandler},
+    driver::{Driver, EndpointError},
+};
+
+pub mod gcc;
+pub mod procon;
+pub mod xinput;
+
+/// Custom trait to unify the API between embassy's HID writer, and our XInput reader/writer (and any
+/// custom writers we may create in the future)
+pub trait HidReaderWriterSplit<'d, D: Driver<'d>, const READ_N: usize, const WRITE_N: usize> {
+    fn split(
+        self,
+    ) -> (
+        impl UsbReader<'d, D, READ_N>,
+        impl UsbWriter<'d, D, WRITE_N>,
+    );
+}
+
+/// Custom trait to unify the API between embassy's HID writer, and our XInput reader (and any
+/// custom writers we may create in the future)
+pub trait UsbReader<'d, D: Driver<'d>, const READ_N: usize> {
+    async fn run<T: RequestHandler>(self, use_report_ids: bool, handler: &mut T) -> !;
+
+    async fn read(&mut self, buf: &mut [u8]) -> Result<usize, ReadError>;
+}
+
+/// Custom trait to unify the API between embassy's HID writer, and our XInput writer (and any
+/// custom writers we may create in the future)
+pub trait UsbWriter<'d, D: Driver<'d>, const WRITE_N: usize> {
+    async fn ready(&mut self);
+
+    async fn write(&mut self, report: &[u8]) -> Result<(), EndpointError>;
+}
+
+impl<'d, D: Driver<'d>, const READ_N: usize, const WRITE_N: usize>
+    HidReaderWriterSplit<'d, D, READ_N, WRITE_N> for HidReaderWriter<'d, D, READ_N, WRITE_N>
+{
+    fn split(
+        self,
+    ) -> (
+        impl UsbReader<'d, D, READ_N>,
+        impl UsbWriter<'d, D, WRITE_N>,
+    ) {
+        self.split()
+    }
+}
+
+impl<'d, D: Driver<'d>, const READ_N: usize> UsbReader<'d, D, READ_N> for HidReader<'d, D, READ_N> {
+    async fn run<T: RequestHandler>(self, use_report_ids: bool, handler: &mut T) -> ! {
+        self.run(use_report_ids, handler).await
+    }
+
+    async fn read(&mut self, buf: &mut [u8]) -> Result<usize, ReadError> {
+        self.read(buf).await
+    }
+}
+
+impl<'d, D: Driver<'d>, const WRITE_N: usize> UsbWriter<'d, D, WRITE_N>
+    for HidWriter<'d, D, WRITE_N>
+{
+    async fn ready(&mut self) {
+        self.ready().await
+    }
+
+    async fn write(&mut self, report: &[u8]) -> Result<(), EndpointError> {
+        self.write(report).await
+    }
+}

src/hid/procon.rs

@@ -0,0 +1,762 @@
+///
+/// The majority of the logic in this file is derived from HOJA-LIB-RP2040
+/// https://github.com/HandHeldLegend/HOJA-LIB-RP2040
+///
+/// The original author gave their consent for this to be included in the NaxGCC firmware,
+/// and for this file to be distributed under the GPLv3, see https://git.naxdy.org/NaxdyOrg/NaxGCC-FW/pulls/26
+///
+use core::ops::{Deref, DerefMut};
+
+use defmt::{info, trace, Format};
+use embassy_rp::clocks::RoscRng;
+use embassy_sync::{blocking_mutex::raw::CriticalSectionRawMutex, signal::Signal};
+use embassy_time::Instant;
+use embassy_usb::{
+    class::hid::{ReportId, RequestHandler},
+    control::OutResponse,
+};
+use packed_struct::{derive::PackedStruct, PackedStruct};
+use rand::RngCore;
+
+use crate::usb_comms::HidReportBuilder;
+
+use super::gcc::GcState;
+
+const SW_INFO_SET_MAC: u8 = 0x01;
+
+const SW_CMD_SET_INPUT_MODE: u8 = 0x03;
+const SW_CMD_GET_DEVINFO: u8 = 0x02;
+const SW_CMD_SET_SHIPMODE: u8 = 0x08;
+const SW_CMD_GET_SPI: u8 = 0x10;
+const SW_CMD_SET_PAIRING: u8 = 0x01;
+const SW_CMD_GET_TRIGGERET: u8 = 0x04;
+
+const ACK_GET_DEVINFO: u8 = 0x82;
+const ACK_GET_SPI: u8 = 0x90;
+const ACK_SET_PAIRING: u8 = 0x81;
+const ACK_GET_TRIGERET: u8 = 0x83;
+
+const ACK_GENERIC: u8 = 0x80;
+
+const RM_SEND_STATE: u8 = 0x30;
+
+const PRO_CONTROLLER_STRING: [u8; 24] = [
+    0x00, 0x25, 0x08, 0x50, 0x72, 0x6F, 0x20, 0x43, 0x6F, 0x6E, 0x74, 0x72, 0x6F, 0x6C, 0x6C, 0x65,
+    0x72, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x68,
+];
+
+#[derive(Debug, Format, Clone, Copy)]
+struct ProconRequestInfo {
+    report_id: ProconRequestId,
+    response_id: ProconResponseId,
+    command_id: u8,
+    raw_data: [u8; 64],
+}
+
+#[derive(Debug, Format, Clone, Copy)]
+enum ProconRequestId {
+    GetInfo = 0x80,
+    Command = 0x01,
+    Rumble = 0x10,
+}
+
+#[derive(Debug, Format, Clone, Copy)]
+enum ProconResponseId {
+    GetInfo = 0x81,
+    GetState = 0x30,
+    Command = 0x21,
+}
+
+static SIGNAL_PROCON_REQUEST: Signal<CriticalSectionRawMutex, ProconRequestInfo> = Signal::new();
+
+#[rustfmt::skip]
+pub const PROCON_REPORT_DESCRIPTOR: &[u8] = &[
+    0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
+    0x15, 0x00, // Logical Minimum (0)
+
+    0x09, 0x04, // Usage (Joystick)
+    0xA1, 0x01, // Collection (Application)
+
+    0x85, 0x30, //   Report ID (48)
+    0x05, 0x01, //   Usage Page (Generic Desktop Ctrls)
+    0x05, 0x09, //   Usage Page (Button)
+    0x19, 0x01, //   Usage Minimum (0x01)
+    0x29, 0x0A, //   Usage Maximum (0x0A)
+    0x15, 0x00, //   Logical Minimum (0)
+    0x25, 0x01, //   Logical Maximum (1)
+    0x75, 0x01, //   Report Size (1)
+    0x95, 0x0A, //   Report Count (10)
+    0x55, 0x00, //   Unit Exponent (0)
+    0x65, 0x00, //   Unit (None)
+    0x81, 0x02, //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+    0x05, 0x09, //   Usage Page (Button)
+    0x19, 0x0B, //   Usage Minimum (0x0B)
+    0x29, 0x0E, //   Usage Maximum (0x0E)
+    0x15, 0x00, //   Logical Minimum (0)
+    0x25, 0x01, //   Logical Maximum (1)
+    0x75, 0x01, //   Report Size (1)
+    0x95, 0x04, //   Report Count (4)
+    0x81, 0x02, //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+    0x75, 0x01, //   Report Size (1)
+    0x95, 0x02, //   Report Count (2)
+    0x81, 0x03, //   Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+
+    0x0B, 0x01, 0x00, 0x01, 0x00, //   Usage (0x010001)
+    0xA1, 0x00,                   //   Collection (Physical)
+    0x0B, 0x30, 0x00, 0x01, 0x00, //     Usage (0x010030)
+    0x0B, 0x31, 0x00, 0x01, 0x00, //     Usage (0x010031)
+    0x0B, 0x32, 0x00, 0x01, 0x00, //     Usage (0x010032)
+    0x0B, 0x35, 0x00, 0x01, 0x00, //     Usage (0x010035)
+    0x15, 0x00,                   //     Logical Minimum (0)
+    0x27, 0xFF, 0xFF, 0x00, 0x00, //     Logical Maximum (65534)
+    0x75, 0x10,                   //     Report Size (16)
+    0x95, 0x04,                   //     Report Count (4)
+    0x81, 0x02,                   //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+    0xC0,                         //   End Collection
+
+    0x0B, 0x39, 0x00, 0x01, 0x00, //   Usage (0x010039)
+    0x15, 0x00,                   //   Logical Minimum (0)
+    0x25, 0x07,                   //   Logical Maximum (7)
+    0x35, 0x00,                   //   Physical Minimum (0)
+    0x46, 0x3B, 0x01,             //   Physical Maximum (315)
+    0x65, 0x14,                   //   Unit (System: English Rotation, Length: Centimeter)
+    0x75, 0x04,                   //   Report Size (4)
+    0x95, 0x01,                   //   Report Count (1)
+    0x81, 0x02,                   //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+    0x05, 0x09,                   //   Usage Page (Button)
+    0x19, 0x0F,                   //   Usage Minimum (0x0F)
+    0x29, 0x12,                   //   Usage Maximum (0x12)
+    0x15, 0x00,                   //   Logical Minimum (0)
+    0x25, 0x01,                   //   Logical Maximum (1)
+    0x75, 0x01,                   //   Report Size (1)
+    0x95, 0x04,                   //   Report Count (4)
+    0x81, 0x02,                   //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+    0x75, 0x08,                   //   Report Size (8)
+    0x95, 0x34,                   //   Report Count (52)
+    0x81, 0x03,                   //   Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+
+    0x06, 0x00, 0xFF, //   Usage Page (Vendor Defined 0xFF00)
+    0x85, 0x21,       //   Report ID (33)
+    0x09, 0x01,       //   Usage (0x01)
+    0x75, 0x08,       //   Report Size (8)
+    0x95, 0x3F,       //   Report Count (63)
+    0x81, 0x03,       //   Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+
+    0x85, 0x81, //   Report ID (-127)
+    0x09, 0x02, //   Usage (0x02)
+    0x75, 0x08, //   Report Size (8)
+    0x95, 0x3F, //   Report Count (63)
+    0x81, 0x03, //   Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+
+    0x85, 0x01, //   Report ID (1)
+    0x09, 0x03, //   Usage (0x03)
+    0x75, 0x08, //   Report Size (8)
+    0x95, 0x3F, //   Report Count (63)
+    0x91, 0x83, //   Output (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Volatile)
+
+    0x85, 0x10, //   Report ID (16)
+    0x09, 0x04, //   Usage (0x04)
+    0x75, 0x08, //   Report Size (8)
+    0x95, 0x3F, //   Report Count (63)
+    0x91, 0x83, //   Output (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Volatile)
+
+    0x85, 0x80, //   Report ID (-128)
+    0x09, 0x05, //   Usage (0x05)
+    0x75, 0x08, //   Report Size (8)
+    0x95, 0x3F, //   Report Count (63)
+    0x91, 0x83, //   Output (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Volatile)
+
+    0x85, 0x82, //   Report ID (-126)
+    0x09, 0x06, //   Usage (0x06)
+    0x75, 0x08, //   Report Size (8)
+    0x95, 0x3F, //   Report Count (63)
+    0x91, 0x83, //   Output (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Volatile)
+
+    0xC0, // End Collection
+
+    // 203 bytes
+];
+
+#[derive(Clone, Copy, Debug, Format)]
+struct ProconByteReport([u8; 64]);
+
+impl Deref for ProconByteReport {
+    type Target = [u8; 64];
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl DerefMut for ProconByteReport {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+impl ProconByteReport {
+    fn set_report_id(&mut self, id: u8) {
+        self[0] = id;
+    }
+
+    fn set_battery_status(&mut self) {
+        self[2] = BatteryStatus::default()
+            .pack()
+            .expect("Failed to pack fake procon battery status")[0];
+    }
+
+    fn set_timer(&mut self) {
+        self[1] = Instant::now().as_millis() as u8;
+    }
+
+    fn set_ack(&mut self, ack: u8) {
+        self[13] = ack;
+    }
+
+    fn set_subcommand(&mut self, cmd: u8) {
+        self[14] = cmd;
+    }
+
+    fn set_devinfo(&mut self) {
+        self[15] = 0x04; // NS Firmware primary   (4.x)
+        self[16] = 0x33; // NS Firmware secondary (x.21)
+
+        self[17] = 0x03; // Controller ID primary (Pro Controller)
+        self[18] = 0x02; // Controller ID secondary
+
+        self[25] = 0x01;
+        self[26] = 0x02;
+    }
+
+    fn sw_spi_readfromaddress(
+        &mut self,
+        offset_address: u8,
+        address: u8,
+        length: u8,
+        switch_host_address: &[u8],
+    ) {
+        let read_info = [address, offset_address, 0x00, 0x00, length];
+        self[15..(15 + read_info.len())].copy_from_slice(&read_info);
+
+        let mut output_spi_data = [0u8; 30];
+
+        output_spi_data.iter_mut().enumerate().for_each(|(i, e)| {
+            *e = sw_spi_getaddressdata(offset_address, address + i as u8, switch_host_address)
+        });
+
+        self[20..(20 + length as usize)].copy_from_slice(&output_spi_data[..(length as usize)]);
+    }
+
+    fn set_trigerret(&mut self, time_10_ms: u16) {
+        let [upper_ms, lower_ms] = time_10_ms.to_be_bytes();
+
+        for i in 0..14 {
+            self[15 + i] = upper_ms;
+            self[16 + i] = lower_ms;
+        }
+    }
+}
+
+fn sw_spi_getaddressdata(offset_address: u8, address: u8, switch_host_address: &[u8]) -> u8 {
+    match offset_address {
+        0x00 => 0x00,
+        0x20..=0x40 => match address {
+            0x26 | 0x00 => 0x95,
+            // Size of pairing data
+            0x27 | 0x01 => 0x22,
+            // Checksum
+            0x28 | 0x29 | 0x02 | 0x03 => 0x00,
+            // Host BT address (Big-endian)
+            0x2A..=0x2F => switch_host_address[(address - 0x2a) as usize],
+            0x04..=0x09 => switch_host_address[(address - 4) as usize],
+            // Bluetooth LTK (Little-endian) NOT IMPLEMENTED YET
+            0x30..=0x3F => 0x00,
+            0x0A..=0x19 => 0x00,
+            // Host capability 0x68 is Nintendo Switch. 0x08 is PC
+            0x4A | 0x24 => 0x68,
+            0x4B | 0x25 => 0,
+            _ => 0x00,
+        },
+        0x50 => 0x00,
+        0x60 => match address {
+            0x00..0x0f => 0xff,
+            0x12 => 0x03,
+            0x13 => 0x02,
+            0x1b => 0x01,
+            0x20 => 35,
+            0x21 => 0,
+            0x22 => 185,
+            0x23 => 255,
+            0x24 => 26,
+            0x25 => 1,
+            0x26 => 0,
+            0x27 => 64,
+            0x28 => 0,
+            0x29 => 64,
+            0x2A => 0,
+            0x2B => 64,
+            0x2C => 1,
+            0x2D => 0,
+            0x2E => 1,
+            0x2F => 0,
+            0x30 => 1,
+            0x31 => 0,
+            0x32 => 0x3B,
+            0x33 => 0x34,
+            0x34 => 0x3B,
+            0x35 => 0x34,
+            0x36 => 0x3B,
+            0x37 => 0x34,
+            0x3d..=0x45 => mk_switch_analog_calibration_data()[(address - 0x3d) as usize],
+            0x46..=0x4e => mk_switch_analog_calibration_data()[(address - 0x3d) as usize],
+            0x4F => 0xFF,
+            0x50 => 26,
+            0x51 => 26,
+            0x52 => 26,
+            0x53..=0x55 => 94,
+            0x56 => 255,
+            0x57 => 255,
+            0x58 => 255,
+            0x59..=0x5B => 255,
+            0x5C => 0x01,
+            0x80 => 80,
+            0x81 => 253,
+            0x82 => 0,
+            0x83 => 0,
+            0x84 => 198,
+            0x85 => 15,
+            0x98 | 0x86 => 15,
+            0x99 | 0x87 => 48,
+            0x9A | 0x88 => 97,
+            0x9B | 0x89 => 174,
+            0x9C | 0x8A => 144,
+            0x9D | 0x8B => 217,
+            0x9E | 0x8C => 212,
+            0x9F | 0x8D => 20,
+            0xA0 | 0x8E => 84,
+            0xA1 | 0x8F => 65,
+            0xA2 | 0x90 => 21,
+            0xA3 | 0x91 => 84,
+            0xA4 | 0x92 => 199,
+            0xA5 | 0x93 => 121,
+            0xA6 | 0x94 => 156,
+            0xA7 | 0x95 => 51,
+            0xA8 | 0x96 => 54,
+            0xA9 | 0x97 => 99,
+            _ => 0,
+        },
+        0x80 => match address {
+            0x10..=0x1a => 0xff,
+            0x1b..=0x25 => 0xff,
+            0x26..=0x3f => 0xff,
+            _ => 0xff,
+        },
+        _ => 0xff,
+    }
+}
+
+fn mk_switch_analog_calibration_data() -> [u8; 18] {
+    fn switch_analog_encode(in_lower: u16, in_upper: u16) -> [u8; 3] {
+        let mut out = [0u8; 3];
+
+        [out[0], out[1]] = in_lower.to_le_bytes();
+
+        out[1] |= ((in_upper & 0xf) << 4) as u8;
+        out[2] = ((in_upper & 0xff0) >> 4) as u8;
+
+        out
+    }
+
+    const MIN: u16 = 128 << 4;
+    const MAXX: u16 = 128 << 4;
+    const CENTER: u16 = 128 << 4;
+
+    let mut out = [0u8; 18];
+
+    out[0..3].copy_from_slice(&switch_analog_encode(MAXX, MAXX));
+    out[3..6].copy_from_slice(&switch_analog_encode(CENTER, CENTER));
+    out[6..9].copy_from_slice(&switch_analog_encode(MIN, MIN));
+
+    out[9..12].copy_from_slice(&switch_analog_encode(CENTER, CENTER));
+    out[12..15].copy_from_slice(&switch_analog_encode(MIN, MIN));
+    out[15..18].copy_from_slice(&switch_analog_encode(MAXX, MAXX));
+
+    info!("Returning switch data: {:x}", out);
+
+    out
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "lsb0", size_bytes = "1")]
+pub struct ProconButtonsRight {
+    #[packed_field(bits = "0")]
+    pub button_y: bool,
+    #[packed_field(bits = "1")]
+    pub button_x: bool,
+    #[packed_field(bits = "2")]
+    pub button_b: bool,
+    #[packed_field(bits = "3")]
+    pub button_a: bool,
+    #[packed_field(bits = "4")]
+    pub trigger_r_sr: bool,
+    #[packed_field(bits = "5")]
+    pub trigger_r_sl: bool,
+    #[packed_field(bits = "6")]
+    pub trigger_r: bool,
+    #[packed_field(bits = "7")]
+    pub trigger_zr: bool,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "lsb0", size_bytes = "1")]
+pub struct ProconButtonsShared {
+    #[packed_field(bits = "0")]
+    pub button_minus: bool,
+    #[packed_field(bits = "1")]
+    pub button_plus: bool,
+    #[packed_field(bits = "2")]
+    pub button_sb_right: bool,
+    #[packed_field(bits = "3")]
+    pub button_sb_left: bool,
+    #[packed_field(bits = "4")]
+    pub button_home: bool,
+    #[packed_field(bits = "5")]
+    pub button_capture: bool,
+    #[packed_field(bits = "6")]
+    pub none: bool,
+    #[packed_field(bits = "7")]
+    pub change_grip_active: bool,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "lsb0", size_bytes = "1")]
+pub struct ProconButtonsLeft {
+    #[packed_field(bits = "0")]
+    pub dpad_down: bool,
+    #[packed_field(bits = "1")]
+    pub dpad_up: bool,
+    #[packed_field(bits = "2")]
+    pub dpad_right: bool,
+    #[packed_field(bits = "3")]
+    pub dped_left: bool,
+    #[packed_field(bits = "4")]
+    pub trigger_l_sr: bool,
+    #[packed_field(bits = "5")]
+    pub trigger_l_sl: bool,
+    #[packed_field(bits = "6")]
+    pub trigger_l: bool,
+    #[packed_field(bits = "7")]
+    pub trigger_zl: bool,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "msb0", endian = "lsb", size_bytes = "9")]
+pub struct ProconState {
+    #[packed_field(bits = "0..=7")]
+    pub buttons_right: ProconButtonsRight,
+    #[packed_field(bits = "8..=15")]
+    pub buttons_shared: ProconButtonsShared,
+    #[packed_field(bits = "16..=23")]
+    pub buttons_left: ProconButtonsLeft,
+    #[packed_field(bits = "24..=39")]
+    pub lstick_x: u16,
+    #[packed_field(bits = "40..=47")]
+    pub lstick_y: u8,
+    #[packed_field(bits = "48..=63")]
+    pub rstick_x: u16,
+    #[packed_field(bits = "64..=71")]
+    pub rstick_y: u8,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "lsb0", endian = "msb", size_bytes = "1")]
+struct BatteryStatus {
+    #[packed_field(bits = "0..=3")]
+    connection: u8,
+    #[packed_field(bits = "4..=7")]
+    battery_level: u8,
+}
+
+impl Default for BatteryStatus {
+    fn default() -> Self {
+        Self {
+            connection: 1,
+            battery_level: 8,
+        }
+    }
+}
+
+impl From<&GcState> for ProconState {
+    fn from(value: &GcState) -> Self {
+        Self {
+            buttons_left: ProconButtonsLeft {
+                dpad_down: value.buttons_1.dpad_down,
+                dpad_right: value.buttons_1.dpad_right,
+                dpad_up: value.buttons_1.dpad_up,
+                dped_left: value.buttons_1.dpad_left,
+                trigger_l: value.buttons_2.button_l,
+                trigger_zl: value.buttons_2.button_l,
+                ..Default::default()
+            },
+            buttons_right: ProconButtonsRight {
+                button_a: value.buttons_1.button_a,
+                button_b: value.buttons_1.button_b,
+                button_x: value.buttons_1.button_x,
+                button_y: value.buttons_1.button_y,
+                trigger_r: value.buttons_2.button_z,
+                trigger_zr: value.buttons_2.button_r,
+                ..Default::default()
+            },
+            buttons_shared: ProconButtonsShared {
+                button_plus: value.buttons_2.button_start && !value.buttons_2.button_z,
+                button_home: value.buttons_2.button_start && value.buttons_2.button_z,
+                ..Default::default()
+            },
+            lstick_x: value.stick_x as u16 * 16,
+            lstick_y: value.stick_y,
+            rstick_x: value.cstick_x as u16 * 16,
+            rstick_y: value.cstick_y,
+        }
+    }
+}
+
+pub struct ProconReportBuilder {
+    switch_reporting_mode: u8,
+    switch_mac_address: [u8; 6],
+    switch_host_address: [u8; 6],
+    switch_ltk: [u8; 16],
+}
+
+impl Default for ProconReportBuilder {
+    fn default() -> Self {
+        Self {
+            switch_reporting_mode: 0,
+            switch_mac_address: gen_switch_mac_address(),
+            switch_host_address: [0u8; 6],
+            switch_ltk: gen_switch_ltk(),
+        }
+    }
+}
+
+fn gen_switch_mac_address() -> [u8; 6] {
+    let mut mac_addr = [0u8; 6];
+
+    mac_addr.iter_mut().for_each(|e| {
+        *e = RoscRng.next_u64() as u8;
+    });
+
+    mac_addr[0] &= 0xfe;
+    mac_addr[5] = 0x9b;
+
+    mac_addr
+}
+
+fn gen_switch_ltk() -> [u8; 16] {
+    let mut switch_ltk = [0u8; 16];
+
+    switch_ltk.iter_mut().for_each(|e| {
+        *e = RoscRng.next_u64() as u8;
+    });
+
+    switch_ltk
+}
+
+impl ProconReportBuilder {
+    fn get_info_report(&self, current_report_info: &ProconRequestInfo) -> [u8; 64] {
+        let mut report = ProconByteReport([0u8; 64]);
+
+        report.set_report_id(ProconResponseId::GetInfo as u8);
+
+        if current_report_info.command_id == SW_INFO_SET_MAC {
+            report[1] = SW_INFO_SET_MAC;
+            report[3] = 0x03;
+
+            self.switch_mac_address
+                .iter()
+                .rev()
+                .enumerate()
+                .for_each(|(i, e)| {
+                    report[4 + i] = *e;
+                });
+        } else {
+            report[1] = current_report_info.command_id;
+        }
+
+        *report
+    }
+
+    fn get_state_report(&self, state: &ProconState) -> [u8; 64] {
+        static mut UNKNOWN: u8 = 0xA;
+
+        unsafe {
+            UNKNOWN = match UNKNOWN {
+                0xA => 0xB,
+                0xB => 0xC,
+                _ => 0xA,
+            };
+        }
+
+        let mut report = ProconByteReport([0u8; 64]);
+
+        let data = state
+            .pack()
+            .expect("Failed to pack pro controller input data");
+
+        report.set_report_id(ProconResponseId::GetState as u8);
+        report.set_timer();
+        report.set_battery_status();
+
+        report[3..=11].copy_from_slice(&data);
+        report[12] = unsafe { UNKNOWN };
+
+        *report
+    }
+
+    fn get_command_report(&mut self, current_report_info: &ProconRequestInfo) -> [u8; 64] {
+        let mut report = ProconByteReport([0u8; 64]);
+
+        report.set_report_id(ProconResponseId::Command as u8);
+        report.set_timer();
+        report.set_battery_status();
+        report.set_subcommand(current_report_info.command_id);
+
+        match current_report_info.command_id {
+            SW_CMD_SET_INPUT_MODE => {
+                report.set_ack(ACK_GENERIC);
+                self.switch_reporting_mode = current_report_info.raw_data[11];
+                info!(
+                    "Switch reporting mode is now {:x}",
+                    self.switch_reporting_mode
+                );
+            }
+            SW_CMD_GET_DEVINFO => {
+                report.set_ack(ACK_GET_DEVINFO);
+                report.set_devinfo();
+            }
+            SW_CMD_GET_SPI => {
+                report.set_ack(ACK_GET_SPI);
+                report.sw_spi_readfromaddress(
+                    current_report_info.raw_data[12],
+                    current_report_info.raw_data[11],
+                    current_report_info.raw_data[15],
+                    &self.switch_host_address,
+                );
+            }
+            SW_CMD_SET_SHIPMODE => {
+                report.set_ack(ACK_GENERIC);
+            }
+            SW_CMD_SET_PAIRING => {
+                report.set_ack(ACK_SET_PAIRING);
+                self.perform_pairing(&mut report, current_report_info);
+            }
+            SW_CMD_GET_TRIGGERET => {
+                report.set_ack(ACK_GET_TRIGERET);
+                report.set_trigerret(100);
+            }
+            _ => {
+                report.set_ack(ACK_GENERIC);
+            }
+        }
+
+        *report
+    }
+
+    fn perform_pairing(
+        &mut self,
+        report: &mut ProconByteReport,
+        current_report_info: &ProconRequestInfo,
+    ) {
+        let pairing_phase = current_report_info.raw_data[11];
+        let host_address = &current_report_info.raw_data[12..];
+
+        match pairing_phase {
+            1 => {
+                self.switch_host_address
+                    .iter_mut()
+                    .enumerate()
+                    .for_each(|(i, e)| *e = host_address[5 - i]);
+
+                report[16..=21].copy_from_slice(&self.switch_mac_address);
+
+                report[22..(22 + PRO_CONTROLLER_STRING.len())]
+                    .copy_from_slice(&PRO_CONTROLLER_STRING);
+            }
+            2 => {
+                report[15] = 2;
+                report[16..(16 + self.switch_ltk.len())].copy_from_slice(&self.switch_ltk);
+            }
+            3 => {
+                report[15] = 3;
+            }
+            _ => {}
+        }
+    }
+}
+
+impl HidReportBuilder<64> for ProconReportBuilder {
+    async fn get_hid_report(&mut self, state: &GcState) -> [u8; 64] {
+        let current_report_info = if self.switch_reporting_mode == RM_SEND_STATE {
+            SIGNAL_PROCON_REQUEST.try_take()
+        } else {
+            Some(SIGNAL_PROCON_REQUEST.wait().await)
+        };
+
+        if let Some(current_report_info) = current_report_info {
+            match current_report_info.report_id {
+                ProconRequestId::GetInfo => self.get_info_report(&current_report_info),
+                ProconRequestId::Command => self.get_command_report(&current_report_info),
+                ProconRequestId::Rumble => self.get_state_report(&ProconState::from(state)),
+            }
+        } else {
+            self.get_state_report(&ProconState::from(state))
+        }
+    }
+}
+
+pub struct ProconRequestHandler;
+
+impl RequestHandler for ProconRequestHandler {
+    fn get_report(&mut self, id: ReportId, _buf: &mut [u8]) -> Option<usize> {
+        info!("Get report for {:?}", id);
+        None
+    }
+
+    fn set_report(&mut self, id: ReportId, data: &[u8]) -> OutResponse {
+        trace!("Set report for {:?}: {:x}", id, data);
+
+        let mut buf = [0u8; 64];
+        let len_to_copy = buf.len().min(data.len());
+        buf[..len_to_copy].copy_from_slice(&data[..len_to_copy]);
+
+        if let ReportId::Out(id) = id {
+            if id == ProconRequestId::GetInfo as u8 {
+                SIGNAL_PROCON_REQUEST.signal(ProconRequestInfo {
+                    command_id: buf[1],
+                    report_id: ProconRequestId::GetInfo,
+                    response_id: ProconResponseId::GetInfo,
+                    raw_data: buf,
+                });
+            } else if id == ProconRequestId::Command as u8 {
+                SIGNAL_PROCON_REQUEST.signal(ProconRequestInfo {
+                    command_id: buf[10],
+                    report_id: ProconRequestId::Command,
+                    response_id: ProconResponseId::Command,
+                    raw_data: buf,
+                });
+            } else if id == ProconRequestId::Rumble as u8 {
+                // TODO: handle rumble
+            }
+        }
+
+        OutResponse::Accepted
+    }
+
+    fn set_idle_ms(&mut self, id: Option<ReportId>, dur: u32) {
+        info!("Set idle rate for {:?} to {:?}", id, dur);
+    }
+
+    fn get_idle_ms(&mut self, id: Option<ReportId>) -> Option<u32> {
+        info!("Get idle rate for {:?}", id);
+        None
+    }
+}

src/hid/xinput.rs

@@ -0,0 +1,544 @@
+///
+/// # XInput Protocol Implementation
+///
+/// The implementations for `XInputReader` and `XInputWriter` and the logic surrounding them is
+/// mostly taken from embassy.
+///
+/// Unfortunately, the embassy hid classes don't allow us to specify a custom interface protocol,
+/// hence the little bit of code duplication.
+///
+use core::{
+    mem::MaybeUninit,
+    sync::atomic::{AtomicUsize, Ordering},
+};
+
+use defmt::{info, trace, warn, Format};
+use embassy_usb::{
+    class::hid::{Config, ReadError, ReportId, RequestHandler},
+    control::{InResponse, OutResponse, Recipient, Request, RequestType},
+    driver::{Driver, Endpoint, EndpointError, EndpointIn, EndpointOut},
+    types::InterfaceNumber,
+    Builder, Handler,
+};
+use packed_struct::{derive::PackedStruct, PackedStruct};
+
+use crate::usb_comms::HidReportBuilder;
+
+use super::{gcc::GcState, HidReaderWriterSplit, UsbReader, UsbWriter};
+
+/// lol
+pub const XINPUT_REPORT_DESCRIPTOR: &[u8] = &[];
+
+const HID_DESC_DESCTYPE_HID: u8 = 0x21;
+const HID_DESC_DESCTYPE_HID_REPORT: u8 = 0x22;
+
+const HID_REQ_SET_IDLE: u8 = 0x0a;
+const HID_REQ_GET_IDLE: u8 = 0x02;
+const HID_REQ_GET_REPORT: u8 = 0x01;
+const HID_REQ_SET_REPORT: u8 = 0x09;
+const HID_REQ_GET_PROTOCOL: u8 = 0x03;
+const HID_REQ_SET_PROTOCOL: u8 = 0x0b;
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "lsb0", size_bytes = "1")]
+pub struct XInputButtons1 {
+    #[packed_field(bits = "0")]
+    pub dpad_up: bool,
+    #[packed_field(bits = "1")]
+    pub dpad_down: bool,
+    #[packed_field(bits = "2")]
+    pub dpad_left: bool,
+    #[packed_field(bits = "3")]
+    pub dpad_right: bool,
+    #[packed_field(bits = "4")]
+    pub button_menu: bool,
+    #[packed_field(bits = "5")]
+    pub button_back: bool,
+    #[packed_field(bits = "6")]
+    pub button_stick_l: bool,
+    #[packed_field(bits = "7")]
+    pub button_stick_r: bool,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "lsb0", size_bytes = "1")]
+pub struct XInputButtons2 {
+    #[packed_field(bits = "0")]
+    pub bumper_l: bool,
+    #[packed_field(bits = "1")]
+    pub bumper_r: bool,
+    #[packed_field(bits = "2")]
+    pub button_guide: bool,
+    #[packed_field(bits = "3")]
+    pub blank_1: bool,
+    #[packed_field(bits = "4")]
+    pub button_a: bool,
+    #[packed_field(bits = "5")]
+    pub button_b: bool,
+    #[packed_field(bits = "6")]
+    pub button_x: bool,
+    #[packed_field(bits = "7")]
+    pub button_y: bool,
+}
+
+///
+/// HID report that is sent back to the host.
+///
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, PackedStruct, Format)]
+#[packed_struct(bit_numbering = "msb0", endian = "lsb", size_bytes = "32")]
+pub struct XInputReport {
+    #[packed_field(bits = "0..=7")]
+    pub report_id: u8,
+    #[packed_field(bits = "8..=15")]
+    pub report_size: u8,
+    #[packed_field(bits = "16..=23")]
+    pub buttons_1: XInputButtons1,
+    #[packed_field(bits = "24..=31")]
+    pub buttons_2: XInputButtons2,
+    #[packed_field(bits = "32..=39")]
+    pub analog_trigger_l: u8,
+    #[packed_field(bits = "40..=47")]
+    pub analog_trigger_r: u8,
+    #[packed_field(bits = "48..=63")]
+    pub stick_left_x: i16,
+    #[packed_field(bits = "64..=79")]
+    pub stick_left_y: i16,
+    #[packed_field(bits = "80..=95")]
+    pub stick_right_x: i16,
+    #[packed_field(bits = "96..=111")]
+    pub stick_right_y: i16,
+    #[packed_field(bits = "112..=255")]
+    pub reserved: [u8; 18],
+}
+
+impl From<&GcState> for XInputReport {
+    fn from(value: &GcState) -> Self {
+        Self {
+            report_id: 0,
+            report_size: 20,
+            buttons_1: XInputButtons1 {
+                dpad_up: value.buttons_1.dpad_up,
+                dpad_down: value.buttons_1.dpad_down,
+                dpad_right: value.buttons_1.dpad_right,
+                dpad_left: value.buttons_1.dpad_left,
+                button_menu: value.buttons_2.button_start,
+                button_back: false,
+                button_stick_l: false,
+                button_stick_r: false,
+            },
+            buttons_2: XInputButtons2 {
+                blank_1: false,
+                bumper_l: false,
+                bumper_r: value.buttons_2.button_z,
+                button_a: value.buttons_1.button_a,
+                button_b: value.buttons_1.button_b,
+                button_x: value.buttons_1.button_x,
+                button_y: value.buttons_1.button_y,
+                button_guide: false,
+            },
+            analog_trigger_l: value.trigger_l,
+            analog_trigger_r: value.trigger_r,
+            stick_left_x: (value.stick_x as i16 - 127).clamp(-127, 127) * 257,
+            stick_left_y: (value.stick_y as i16 - 127).clamp(-127, 127) * 257,
+            stick_right_x: (value.cstick_x as i16 - 127).clamp(-127, 127) * 257,
+            stick_right_y: (value.cstick_y as i16 - 127).clamp(-127, 127) * 257,
+            reserved: [0u8; 18],
+        }
+    }
+}
+
+///
+/// Takes in a GcState, converts it to an `XInputReport` and returns its packed version.
+///
+pub struct XInputReportBuilder;
+
+impl HidReportBuilder<32> for XInputReportBuilder {
+    async fn get_hid_report(&mut self, state: &super::gcc::GcState) -> [u8; 32] {
+        XInputReport::from(state)
+            .pack()
+            .expect("Failed to pack XInput State")
+    }
+}
+
+///
+/// Handles packets sent from the host.
+///
+pub struct XInputRequestHandler;
+
+impl RequestHandler for XInputRequestHandler {
+    fn get_report(
+        &mut self,
+        id: embassy_usb::class::hid::ReportId,
+        buf: &mut [u8],
+    ) -> Option<usize> {
+        let _ = (id, buf);
+        None
+    }
+
+    fn set_report(
+        &mut self,
+        id: embassy_usb::class::hid::ReportId,
+        data: &[u8],
+    ) -> embassy_usb::control::OutResponse {
+        let _ = (id, data);
+        info!("Set report for {:?}: {:x}", id, data);
+        embassy_usb::control::OutResponse::Accepted
+    }
+
+    fn get_idle_ms(&mut self, id: Option<embassy_usb::class::hid::ReportId>) -> Option<u32> {
+        let _ = id;
+        None
+    }
+
+    fn set_idle_ms(&mut self, id: Option<embassy_usb::class::hid::ReportId>, duration_ms: u32) {
+        let _ = (id, duration_ms);
+    }
+}
+
+/// Taken from embassy.
+pub struct XInputWriter<'d, D: Driver<'d>, const N: usize> {
+    ep_in: D::EndpointIn,
+}
+
+impl<'d, D: Driver<'d>, const N: usize> UsbWriter<'d, D, N> for XInputWriter<'d, D, N> {
+    /// Waits for the interrupt in endpoint to be enabled.
+    async fn ready(&mut self) {
+        self.ep_in.wait_enabled().await;
+    }
+
+    /// Writes `report` to its interrupt endpoint.
+    async fn write(&mut self, report: &[u8]) -> Result<(), EndpointError> {
+        assert!(report.len() <= N);
+
+        let max_packet_size = usize::from(self.ep_in.info().max_packet_size);
+        let zlp_needed = report.len() < N && (report.len() % max_packet_size == 0);
+        for chunk in report.chunks(max_packet_size) {
+            self.ep_in.write(chunk).await?;
+        }
+
+        if zlp_needed {
+            self.ep_in.write(&[]).await?;
+        }
+
+        Ok(())
+    }
+}
+
+/// Taken from embassy.
+pub struct XInputReader<'d, D: Driver<'d>, const N: usize> {
+    ep_out: D::EndpointOut,
+    offset: &'d AtomicUsize,
+}
+
+impl<'d, D: Driver<'d>, const N: usize> UsbReader<'d, D, N> for XInputReader<'d, D, N> {
+    async fn run<T: RequestHandler>(mut self, use_report_ids: bool, handler: &mut T) -> ! {
+        let offset = self.offset.load(Ordering::Acquire);
+        assert!(offset == 0);
+        let mut buf = [0; N];
+        loop {
+            match self.read(&mut buf).await {
+                Ok(len) => {
+                    let id = if use_report_ids { buf[0] } else { 0 };
+                    handler.set_report(ReportId::Out(id), &buf[..len]);
+                }
+                Err(ReadError::BufferOverflow) => warn!(
+                    "Host ent output report larger than the configured maximum output report length ({})",
+                    N
+                ),
+                Err(ReadError::Disabled) => self.ep_out.wait_enabled().await,
+                Err(ReadError::Sync(_)) => unreachable!(),
+            }
+        }
+    }
+
+    async fn read(&mut self, buf: &mut [u8]) -> Result<usize, ReadError> {
+        assert!(N != 0);
+        assert!(buf.len() >= N);
+
+        // Read packets from the endpoint
+        let max_packet_size = usize::from(self.ep_out.info().max_packet_size);
+        let starting_offset = self.offset.load(Ordering::Acquire);
+        let mut total = starting_offset;
+        loop {
+            for chunk in buf[starting_offset..N].chunks_mut(max_packet_size) {
+                match self.ep_out.read(chunk).await {
+                    Ok(size) => {
+                        total += size;
+                        if size < max_packet_size || total == N {
+                            self.offset.store(0, Ordering::Release);
+                            break;
+                        }
+                        self.offset.store(total, Ordering::Release);
+                    }
+                    Err(err) => {
+                        self.offset.store(0, Ordering::Release);
+                        return Err(err.into());
+                    }
+                }
+            }
+
+            // Some hosts may send ZLPs even when not required by the HID spec, so we'll loop as long as total == 0.
+            if total > 0 {
+                break;
+            }
+        }
+
+        if starting_offset > 0 {
+            Err(ReadError::Sync(starting_offset..total))
+        } else {
+            Ok(total)
+        }
+    }
+}
+
+/// Taken from embassy, with a few modifications to the descriptor.
+pub struct XInputReaderWriter<'d, D: Driver<'d>, const READ_N: usize, const WRITE_N: usize> {
+    reader: XInputReader<'d, D, READ_N>,
+    writer: XInputWriter<'d, D, WRITE_N>,
+}
+
+impl<'d, D: Driver<'d>, const READ_N: usize, const WRITE_N: usize>
+    XInputReaderWriter<'d, D, READ_N, WRITE_N>
+{
+    pub fn new(
+        builder: &mut Builder<'d, D>,
+        state: &'d mut XInputState<'d>,
+        config: Config<'d>,
+    ) -> Self {
+        let mut func = builder.function(0xff, 0x5d, 0x01);
+        let mut iface = func.interface();
+        let if_num = iface.interface_number();
+        let mut alt = iface.alt_setting(0xff, 0x5d, 0x01, None);
+
+        #[rustfmt::skip]
+        alt.descriptor(0x21, &[
+            0x10, 0x01, // bcdHID 1.10
+            0x01,       // bCountryCode
+            0x24,       // bNumDescriptors
+            0x81,       // bDescriptorType[0] (Unknown 0x81)
+            0x14, 0x03, // wDescriptorLength[0] 788
+            0x00,       // bDescriptorType[1] (Unknown 0x00)
+            0x03, 0x13, // wDescriptorLength[1] 4867
+            0x02,       // bDescriptorType[2] (Unknown 0x02)
+            0x00, 0x03, // wDescriptorLength[2] 768
+            0x00,       // bDescriptorType[3] (Unknown 0x00)
+        ]);
+
+        let ep_in = alt.endpoint_interrupt_in(config.max_packet_size_in, config.poll_ms);
+        let ep_out = alt.endpoint_interrupt_out(config.max_packet_size_out, config.poll_ms);
+
+        drop(func);
+
+        let control = state.control.write(XInputControl::new(
+            if_num,
+            config.report_descriptor,
+            config.request_handler,
+            &state.out_report_offset,
+        ));
+        builder.handler(control);
+
+        Self {
+            reader: XInputReader {
+                ep_out,
+                offset: &state.out_report_offset,
+            },
+            writer: XInputWriter { ep_in },
+        }
+    }
+}
+
+impl<'d, D: Driver<'d>, const READ_N: usize, const WRITE_N: usize>
+    HidReaderWriterSplit<'d, D, READ_N, WRITE_N> for XInputReaderWriter<'d, D, READ_N, WRITE_N>
+{
+    fn split(
+        self,
+    ) -> (
+        impl UsbReader<'d, D, READ_N>,
+        impl UsbWriter<'d, D, WRITE_N>,
+    ) {
+        (self.reader, self.writer)
+    }
+}
+
+pub struct XInputState<'d> {
+    control: MaybeUninit<XInputControl<'d>>,
+    out_report_offset: AtomicUsize,
+}
+
+impl<'d> Default for XInputState<'d> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl<'d> XInputState<'d> {
+    pub const fn new() -> Self {
+        XInputState {
+            control: MaybeUninit::uninit(),
+            out_report_offset: AtomicUsize::new(0),
+        }
+    }
+}
+
+/// Taken from embassy.
+struct XInputControl<'d> {
+    if_num: InterfaceNumber,
+    report_descriptor: &'d [u8],
+    request_handler: Option<&'d mut dyn RequestHandler>,
+    out_report_offset: &'d AtomicUsize,
+    hid_descriptor: [u8; 16],
+}
+
+impl<'d> XInputControl<'d> {
+    fn new(
+        if_num: InterfaceNumber,
+        report_descriptor: &'d [u8],
+        request_handler: Option<&'d mut dyn RequestHandler>,
+        out_report_offset: &'d AtomicUsize,
+    ) -> Self {
+        XInputControl {
+            if_num,
+            report_descriptor,
+            request_handler,
+            out_report_offset,
+            #[rustfmt::skip]
+            hid_descriptor: [
+                0x10,       // bLength
+                0x21,       // bDescriptorType (HID)
+                0x10, 0x01, // bcdHID 1.10
+                0x01,       // bCountryCode
+                0x24,       // bNumDescriptors
+                0x81,       // bDescriptorType[0] (Unknown 0x81)
+                0x14, 0x03, // wDescriptorLength[0] 788
+                0x00,       // bDescriptorType[1] (Unknown 0x00)
+                0x03, 0x13, // wDescriptorLength[1] 4867
+                0x02,       // bDescriptorType[2] (Unknown 0x02)
+                0x00, 0x03, // wDescriptorLength[2] 768
+                0x00,       // bDescriptorType[3] (Unknown 0x00)
+            ],
+        }
+    }
+}
+
+/// Helper function, since the function in `ReportId` is private.
+const fn try_u16_to_report_id(value: u16) -> Result<ReportId, ()> {
+    match value >> 8 {
+        1 => Ok(ReportId::In(value as u8)),
+        2 => Ok(ReportId::Out(value as u8)),
+        3 => Ok(ReportId::Feature(value as u8)),
+        _ => Err(()),
+    }
+}
+
+impl<'d> Handler for XInputControl<'d> {
+    fn reset(&mut self) {
+        self.out_report_offset.store(0, Ordering::Release);
+    }
+
+    fn control_out(&mut self, req: Request, data: &[u8]) -> Option<OutResponse> {
+        if (req.request_type, req.recipient, req.index)
+            != (
+                RequestType::Class,
+                Recipient::Interface,
+                self.if_num.0 as u16,
+            )
+        {
+            return None;
+        }
+
+        trace!("HID control_out {:?} {=[u8]:x}", req, data);
+
+        match req.request {
+            HID_REQ_SET_IDLE => {
+                if let Some(handler) = self.request_handler.as_mut() {
+                    let id = req.value as u8;
+                    let id = (id != 0).then_some(ReportId::In(id));
+                    let dur = u32::from(req.value >> 8);
+                    let dur = if dur == 0 { u32::MAX } else { 4 * dur };
+                    handler.set_idle_ms(id, dur);
+                }
+                Some(OutResponse::Accepted)
+            }
+            HID_REQ_SET_REPORT => {
+                match (
+                    try_u16_to_report_id(req.value),
+                    self.request_handler.as_mut(),
+                ) {
+                    (Ok(id), Some(handler)) => Some(handler.set_report(id, data)),
+                    _ => Some(OutResponse::Rejected),
+                }
+            }
+            HID_REQ_SET_PROTOCOL => {
+                if req.value == 1 {
+                    Some(OutResponse::Accepted)
+                } else {
+                    warn!("HID Boot Protocol is unsupported.");
+                    Some(OutResponse::Rejected) // UNSUPPORTED: Boot Protocol
+                }
+            }
+            _ => Some(OutResponse::Rejected),
+        }
+    }
+
+    fn control_in<'a>(&'a mut self, req: Request, buf: &'a mut [u8]) -> Option<InResponse<'a>> {
+        if req.index != self.if_num.0 as u16 {
+            return None;
+        }
+
+        match (req.request_type, req.recipient) {
+            (RequestType::Standard, Recipient::Interface) => match req.request {
+                Request::GET_DESCRIPTOR => match (req.value >> 8) as u8 {
+                    HID_DESC_DESCTYPE_HID_REPORT => {
+                        Some(InResponse::Accepted(self.report_descriptor))
+                    }
+                    HID_DESC_DESCTYPE_HID => Some(InResponse::Accepted(&self.hid_descriptor)),
+                    _ => Some(InResponse::Rejected),
+                },
+
+                _ => Some(InResponse::Rejected),
+            },
+            (RequestType::Class, Recipient::Interface) => {
+                trace!("HID control_in {:?}", req);
+                match req.request {
+                    HID_REQ_GET_REPORT => {
+                        let size = match try_u16_to_report_id(req.value) {
+                            Ok(id) => self
+                                .request_handler
+                                .as_mut()
+                                .and_then(|x| x.get_report(id, buf)),
+                            Err(_) => None,
+                        };
+
+                        if let Some(size) = size {
+                            Some(InResponse::Accepted(&buf[0..size]))
+                        } else {
+                            Some(InResponse::Rejected)
+                        }
+                    }
+                    HID_REQ_GET_IDLE => {
+                        if let Some(handler) = self.request_handler.as_mut() {
+                            let id = req.value as u8;
+                            let id = (id != 0).then_some(ReportId::In(id));
+                            if let Some(dur) = handler.get_idle_ms(id) {
+                                let dur = u8::try_from(dur / 4).unwrap_or(0);
+                                buf[0] = dur;
+                                Some(InResponse::Accepted(&buf[0..1]))
+                            } else {
+                                Some(InResponse::Rejected)
+                            }
+                        } else {
+                            Some(InResponse::Rejected)
+                        }
+                    }
+                    HID_REQ_GET_PROTOCOL => {
+                        // UNSUPPORTED: Boot Protocol
+                        buf[0] = 1;
+                        Some(InResponse::Accepted(&buf[0..1]))
+                    }
+                    _ => Some(InResponse::Rejected),
+                }
+            }
+            _ => None,
+        }
+    }
+}

src/input.rs

@@ -1,7 +1,7 @@
 use defmt::{debug, info, trace, Format};
 use embassy_futures::yield_now;
 use embassy_rp::{
-    gpio::{AnyPin, Input, Output, Pin},
+    gpio::{Input, Output},
     peripherals::SPI0,
     spi::{Blocking, Spi},
 };
@@ -16,18 +16,20 @@ use libm::{fmaxf, fminf};
 
 use crate::{
     config::{
-        ControllerConfig, OverrideGcReportInstruction, OverrideStickState, SIGNAL_CONFIG_CHANGE,
-        SIGNAL_IS_CALIBRATING, SIGNAL_OVERRIDE_GCC_STATE, SIGNAL_OVERRIDE_STICK_STATE,
+        ControllerConfig, ControllerMode, InputConsistencyMode, OverrideGcReportInstruction,
+        OverrideStickState, SIGNAL_CONFIG_CHANGE, SIGNAL_IS_CALIBRATING, SIGNAL_OVERRIDE_GCC_STATE,
+        SIGNAL_OVERRIDE_STICK_STATE,
     },
     filter::{run_waveshaping, FilterGains, KalmanState, WaveshapingValues, FILTER_GAINS},
-    gcc_hid::GcReport,
     helpers::XyValuePair,
+    hid::gcc::GcState,
     input_filter::{DummyFilter, InputFilter},
     stick::{linearize, notch_remap, StickParams},
+    usb_comms::{MUTEX_CONTROLLER_MODE, MUTEX_INPUT_CONSISTENCY_MODE},
 };
 
 /// Used to send the button state to the usb task and the calibration task
-pub static CHANNEL_GCC_STATE: PubSubChannel<CriticalSectionRawMutex, GcReport, 1, 4, 1> =
+pub static CHANNEL_GCC_STATE: PubSubChannel<CriticalSectionRawMutex, GcState, 1, 4, 1> =
     PubSubChannel::new();
 
 /// Used to send the stick state from the stick task to the main input task
@@ -35,10 +37,8 @@ static SIGNAL_STICK_STATE: Signal<CriticalSectionRawMutex, StickState> = Signal:
 
 pub static SPI_SHARED: Mutex<ThreadModeRawMutex, Option<Spi<'static, SPI0, Blocking>>> =
     Mutex::new(None);
-pub static SPI_ACS_SHARED: Mutex<ThreadModeRawMutex, Option<Output<'static, AnyPin>>> =
-    Mutex::new(None);
-pub static SPI_CCS_SHARED: Mutex<ThreadModeRawMutex, Option<Output<'static, AnyPin>>> =
-    Mutex::new(None);
+pub static SPI_ACS_SHARED: Mutex<ThreadModeRawMutex, Option<Output<'static>>> = Mutex::new(None);
+pub static SPI_CCS_SHARED: Mutex<ThreadModeRawMutex, Option<Output<'static>>> = Mutex::new(None);
 
 const STICK_HYST_VAL: f32 = 0.3;
 pub const FLOAT_ORIGIN: f32 = 127.5;
@@ -81,19 +81,14 @@ pub enum StickAxis {
     YAxis,
 }
 
+#[inline(never)]
 #[link_section = ".time_critical.read_ext_adc"]
-pub fn read_ext_adc<
-    'a,
-    Acs: Pin,
-    Ccs: Pin,
-    I: embassy_rp::spi::Instance,
-    M: embassy_rp::spi::Mode,
->(
+pub fn read_ext_adc<'a, I: embassy_rp::spi::Instance, M: embassy_rp::spi::Mode>(
     which_stick: Stick,
     which_axis: StickAxis,
     spi: &mut Spi<'a, I, M>,
-    spi_acs: &mut Output<'a, Acs>,
-    spi_ccs: &mut Output<'a, Ccs>,
+    spi_acs: &mut Output<'a>,
+    spi_ccs: &mut Output<'a>,
 ) -> u16 {
     let mut buf = [0b11010000; 3];
 
@@ -124,6 +119,7 @@ pub fn read_ext_adc<
 /// Gets the average stick state over a 1ms interval in a non-blocking fashion.
 /// Will wait until end_time is reached before continuing after reading the ADCs.
 #[allow(clippy::too_many_arguments)]
+#[inline(never)]
 #[link_section = ".time_critical.update_stick_states"]
 async fn update_stick_states(
     current_stick_state: &StickState,
@@ -154,8 +150,9 @@ async fn update_stick_states(
     let spi_acs = spi_acs_unlocked.as_mut().unwrap();
     let spi_ccs = spi_ccs_unlocked.as_mut().unwrap();
 
-    // "do-while at home"
-    while {
+    let mut done = false;
+
+    while !done {
         let loop_start = Instant::now();
 
         adc_count += 1;
@@ -165,8 +162,9 @@ async fn update_stick_states(
         cy_sum += read_ext_adc(Stick::CStick, StickAxis::YAxis, spi, spi_acs, spi_ccs) as u32;
 
         let loop_end = Instant::now();
-        loop_end < end_time - (loop_end - loop_start)
-    } {}
+
+        done = loop_end >= end_time - (loop_end - loop_start);
+    }
 
     trace!("ADC Count: {}", adc_count);
 
@@ -346,33 +344,20 @@ async fn update_stick_states(
 }
 
 #[allow(clippy::too_many_arguments)]
-fn update_button_states<
-    A: Pin,
-    B: Pin,
-    X: Pin,
-    Y: Pin,
-    Start: Pin,
-    L: Pin,
-    R: Pin,
-    Z: Pin,
-    DLeft: Pin,
-    DRight: Pin,
-    DUp: Pin,
-    DDown: Pin,
->(
-    gcc_state: &mut GcReport,
-    btn_a: &Input<'_, A>,
-    btn_b: &Input<'_, B>,
-    btn_x: &Input<'_, X>,
-    btn_y: &Input<'_, Y>,
-    btn_start: &Input<'_, Start>,
-    btn_l: &Input<'_, L>,
-    btn_r: &Input<'_, R>,
-    btn_z: &Input<'_, Z>,
-    btn_dleft: &Input<'_, DLeft>,
-    btn_dright: &Input<'_, DRight>,
-    btn_dup: &Input<'_, DUp>,
-    btn_ddown: &Input<'_, DDown>,
+fn update_button_states(
+    gcc_state: &mut GcState,
+    btn_a: &Input<'_>,
+    btn_b: &Input<'_>,
+    btn_x: &Input<'_>,
+    btn_y: &Input<'_>,
+    btn_start: &Input<'_>,
+    btn_l: &Input<'_>,
+    btn_r: &Input<'_>,
+    btn_z: &Input<'_>,
+    btn_dleft: &Input<'_>,
+    btn_dright: &Input<'_>,
+    btn_dup: &Input<'_>,
+    btn_ddown: &Input<'_>,
 ) {
     gcc_state.buttons_1.button_a = btn_a.is_low();
     gcc_state.buttons_1.button_b = btn_b.is_low();
@@ -401,7 +386,7 @@ pub async fn input_integrity_benchmark() {
     loop {
         SIGNAL_OVERRIDE_GCC_STATE.signal(OverrideGcReportInstruction {
             report: {
-                let mut report = GcReport::default();
+                let mut report = GcState::default();
                 report.buttons_1.dpad_up = true;
                 report
             },
@@ -417,18 +402,18 @@ pub async fn input_integrity_benchmark() {
 #[allow(clippy::too_many_arguments)]
 #[embassy_executor::task]
 pub async fn update_button_state_task(
-    btn_z: Input<'static, AnyPin>,
-    btn_a: Input<'static, AnyPin>,
-    btn_b: Input<'static, AnyPin>,
-    btn_dright: Input<'static, AnyPin>,
-    btn_dup: Input<'static, AnyPin>,
-    btn_ddown: Input<'static, AnyPin>,
-    btn_dleft: Input<'static, AnyPin>,
-    btn_l: Input<'static, AnyPin>,
-    btn_r: Input<'static, AnyPin>,
-    btn_x: Input<'static, AnyPin>,
-    btn_y: Input<'static, AnyPin>,
-    btn_start: Input<'static, AnyPin>,
+    btn_z: Input<'static>,
+    btn_a: Input<'static>,
+    btn_b: Input<'static>,
+    btn_dright: Input<'static>,
+    btn_dup: Input<'static>,
+    btn_ddown: Input<'static>,
+    btn_dleft: Input<'static>,
+    btn_l: Input<'static>,
+    btn_r: Input<'static>,
+    btn_x: Input<'static>,
+    btn_y: Input<'static>,
+    btn_start: Input<'static>,
 ) {
     // upon loop entry, we check for the reset combo once
     if btn_a.is_low() && btn_x.is_low() && btn_y.is_low() {
@@ -439,7 +424,27 @@ pub async fn update_button_state_task(
         loop {}
     }
 
-    let mut gcc_state = GcReport::default();
+    {
+        let mut m = MUTEX_CONTROLLER_MODE.lock().await;
+        *m = if btn_start.is_low() {
+            Some(ControllerMode::Procon)
+        } else if btn_x.is_low() {
+            Some(ControllerMode::XInput)
+        } else {
+            Some(ControllerMode::GcAdapter)
+        };
+    }
+
+    let input_consistency_mode = {
+        while MUTEX_INPUT_CONSISTENCY_MODE.lock().await.is_none() {
+            Timer::after(Duration::from_millis(100)).await;
+        }
+        MUTEX_INPUT_CONSISTENCY_MODE.lock().await.unwrap()
+    };
+
+    let mut previous_state = GcState::default();
+
+    let mut gcc_state = GcState::default();
 
     let gcc_publisher = CHANNEL_GCC_STATE.publisher().unwrap();
 
@@ -448,6 +453,10 @@ pub async fn update_button_state_task(
     // replace this with the input filter of your choice, if you so desire.
     let mut input_filter = DummyFilter;
 
+    let mut initializing = true;
+
+    let init_time = Instant::now();
+
     loop {
         update_button_states(
             &mut gcc_state,
@@ -483,7 +492,15 @@ pub async fn update_button_state_task(
             trace!("Overridden gcc state: {:?}", override_gcc_state.report);
             let end_time = Instant::now() + Duration::from_millis(override_gcc_state.duration_ms);
             while Instant::now() < end_time {
-                gcc_publisher.publish_immediate(override_gcc_state.report);
+                if input_consistency_mode == InputConsistencyMode::SuperHack {
+                    if override_gcc_state.report != previous_state {
+                        gcc_publisher.publish_immediate(override_gcc_state.report);
+                        previous_state = override_gcc_state.report;
+                    }
+                } else {
+                    gcc_publisher.publish_immediate(override_gcc_state.report);
+                }
+
                 yield_now().await;
             }
         };
@@ -503,7 +520,20 @@ pub async fn update_button_state_task(
             gcc_publisher.publish_immediate(overriden_gcc_state);
         } else {
             input_filter.apply_filter(&mut gcc_state);
-            gcc_publisher.publish_immediate(gcc_state);
+            if input_consistency_mode == InputConsistencyMode::SuperHack {
+                // transmit state always for the first 5 seconds to give the console time to initialize the controller
+                if initializing && Instant::now().duration_since(init_time) > Duration::from_secs(5)
+                {
+                    initializing = false;
+                }
+
+                if gcc_state != previous_state || initializing {
+                    gcc_publisher.publish_immediate(gcc_state);
+                    previous_state = gcc_state;
+                }
+            } else {
+                gcc_publisher.publish_immediate(gcc_state);
+            }
         }
 
         // give other tasks a chance to do something
@@ -516,13 +546,17 @@ pub async fn update_button_state_task(
 ///
 /// Has to run on core0 because it makes use of SPI0.
 #[embassy_executor::task]
+#[inline(never)]
 #[link_section = ".time_critical.update_stick_states_task"]
 pub async fn update_stick_states_task(
     spi: Spi<'static, SPI0, embassy_rp::spi::Blocking>,
-    spi_acs: Output<'static, AnyPin>,
-    spi_ccs: Output<'static, AnyPin>,
+    spi_acs: Output<'static>,
+    spi_ccs: Output<'static>,
 ) {
-    Timer::after_secs(1).await;
+    // let some time pass before accepting stick inputs
+    // to ensure sticks are properly zeroed
+    Timer::after_secs(2).await;
+
     *SPI_SHARED.lock().await = Some(spi);
     *SPI_ACS_SHARED.lock().await = Some(spi_acs);
     *SPI_CCS_SHARED.lock().await = Some(spi_ccs);
@@ -581,7 +615,7 @@ pub async fn update_stick_states_task(
             let n = Instant::now();
 
             match (n - last_loop_time).as_micros() {
-                a if a > 1666 => debug!("Loop took {} us", a),
+                a if a > 800 => debug!("Loop took {} us", a),
                 _ => {}
             };
             last_loop_time = n;

src/input_filter.rs

@@ -2,15 +2,19 @@ use defmt::warn;
 
 use crate::{
     config::{is_awaitable_button_pressed, AwaitableButtons},
-    gcc_hid::GcReport,
+    hid::gcc::GcState,
 };
 
 /**
  * Houses functionality for modifying GCC state before it is sent to the console.
+ *
+ * General info for implementing filters on the sticks:
+ * X and Y values of a stick go each from 0 to 255.
+ * 127.5 is the middle value and when both X and Y are 127.5 the stick is in neutral position.
  */
 
 pub trait InputFilter: Sized {
-    fn apply_filter(&mut self, gcc_state: &mut GcReport);
+    fn apply_filter(&mut self, gcc_state: &mut GcState);
 }
 
 /// Presses a single button if another button is pressed.
@@ -22,7 +26,7 @@ pub struct SingleButtonMacroFilter {
 }
 
 impl InputFilter for SingleButtonMacroFilter {
-    fn apply_filter(&mut self, gcc_state: &mut GcReport) {
+    fn apply_filter(&mut self, gcc_state: &mut GcState) {
         if is_awaitable_button_pressed(gcc_state, &self.btn_instigator) {
             match self.btn_to_press {
                 AwaitableButtons::A => {
@@ -79,7 +83,7 @@ impl InputFilter for SingleButtonMacroFilter {
 pub struct CStickUpTiltFilter;
 
 impl InputFilter for CStickUpTiltFilter {
-    fn apply_filter(&mut self, gcc_state: &mut GcReport) {
+    fn apply_filter(&mut self, gcc_state: &mut GcState) {
         if gcc_state.cstick_y > 157 {
             if (137..=201).contains(&gcc_state.cstick_x) {
                 gcc_state.cstick_x = 201;
@@ -100,10 +104,37 @@ impl InputFilter for CStickUpTiltFilter {
     }
 }
 
+/// Improves hitting up/down angled forward tilt at the cost
+/// of making it impossible to hit turnaround up & down tilt
+/// and making it slightly harder to hit regular forward tilt.
+pub struct CStickAngledFTiltFilter;
+
+impl InputFilter for CStickAngledFTiltFilter {
+    fn apply_filter(&mut self, gcc_state: &mut GcState) {
+        if gcc_state.cstick_y > 147 {
+            if (147..=225).contains(&gcc_state.cstick_x) {
+                gcc_state.cstick_x = 205;
+                gcc_state.cstick_y = 205;
+            } else if (30..=107).contains(&gcc_state.cstick_x) {
+                gcc_state.cstick_x = 50;
+                gcc_state.cstick_y = 205;
+            }
+        } else if gcc_state.cstick_y < 107 {
+            if (147..=225).contains(&gcc_state.cstick_x) {
+                gcc_state.cstick_x = 205;
+                gcc_state.cstick_y = 50;
+            } else if (30..=107).contains(&gcc_state.cstick_x) {
+                gcc_state.cstick_x = 50;
+                gcc_state.cstick_y = 50;
+            }
+        }
+    }
+}
+
 /// Does nothing.
 #[derive(Default)]
 pub struct DummyFilter;
 
 impl InputFilter for DummyFilter {
-    fn apply_filter(&mut self, _gcc_state: &mut GcReport) {}
+    fn apply_filter(&mut self, _gcc_state: &mut GcState) {}
 }

src/main.rs

@@ -1,19 +1,18 @@
-//! This example test the RP Pico on board LED.
-//!
-//! It does not work with the RP Pico W board. See wifi_blinky.rs.
-
 #![no_std]
 #![no_main]
 mod config;
 mod filter;
-mod gcc_hid;
 mod helpers;
+mod hid;
 mod input;
 mod input_filter;
 mod stick;
+mod usb_comms;
+
+use core::ptr::addr_of_mut;
 
 use config::config_task;
-use defmt::{debug, info};
+use defmt::info;
 use embassy_executor::Executor;
 use embassy_rp::{
     bind_interrupts,
@@ -24,14 +23,14 @@ use embassy_rp::{
     spi::{self, Spi},
     usb::{Driver, InterruptHandler},
 };
-use gcc_hid::usb_transfer_task;
 use gpio::{Level, Output};
+use usb_comms::usb_transfer_task;
 
 use input::{update_button_state_task, update_stick_states_task};
 use static_cell::StaticCell;
 
 use crate::config::enter_config_mode_task;
-use crate::gcc_hid::rumble_task;
+use crate::usb_comms::rumble_task;
 
 use {defmt_rtt as _, panic_probe as _};
 
@@ -75,49 +74,37 @@ fn main() -> ! {
     let spi_acs = Output::new(AnyPin::from(p_acs), Level::High); // active low
     let spi_ccs = Output::new(AnyPin::from(p_ccs), Level::High); // active low
 
-    spawn_core1(p.CORE1, unsafe { &mut CORE1_STACK }, move || {
-        let executor1 = EXECUTOR1.init(Executor::new());
-        debug!("Mana");
-        executor1.run(|spawner| {
-            spawner.spawn(usb_transfer_task(uid, driver)).unwrap();
-            spawner.spawn(enter_config_mode_task()).unwrap();
-            spawner
-                .spawn(rumble_task(p.PIN_25, p.PIN_29, p.PWM_CH4, p.PWM_CH6))
-                .unwrap();
-            // spawner.spawn(input_integrity_benchmark()).unwrap();
-            spawner
-                .spawn(update_button_state_task(
-                    Input::new(AnyPin::from(p.PIN_20), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_17), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_16), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_11), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_9), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_10), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_8), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_22), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_21), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_18), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_19), gpio::Pull::Up),
-                    Input::new(AnyPin::from(p.PIN_5), gpio::Pull::Up),
-                ))
-                .unwrap()
-        });
-    });
-
-    // Stick loop has to run on core0 because it makes use of SPI0.
-    // Perhaps in the future we can rewire the board to have it make use of SPI1 instead.
-    // This way it could be the sole task running on core1, and everything else could happen on core0.
-    // Also, it needs to run on a higher prio executor to ensure consistent polling.
-    // interrupt::SWI_IRQ_1.set_priority(interrupt::Priority::P0);
-    // let spawner_high = EXECUTOR_HIGH.start(interrupt::SWI_IRQ_1);
-    // spawner_high
-    //     .spawn(update_stick_states_task(
-    //         spi,
-    //         spi_acs,
-    //         spi_ccs,
-    //         controller_config.clone(),
-    //     ))
-    //     .unwrap();
+    spawn_core1(
+        p.CORE1,
+        unsafe { addr_of_mut!(CORE1_STACK).as_mut().unwrap() },
+        move || {
+            let executor1 = EXECUTOR1.init(Executor::new());
+            executor1.run(|spawner| {
+                spawner.spawn(usb_transfer_task(uid, driver)).unwrap();
+                spawner.spawn(enter_config_mode_task()).unwrap();
+                spawner
+                    .spawn(rumble_task(p.PIN_25, p.PIN_29, p.PWM_SLICE4, p.PWM_SLICE6))
+                    .unwrap();
+                // spawner.spawn(input_integrity_benchmark()).unwrap();
+                spawner
+                    .spawn(update_button_state_task(
+                        Input::new(AnyPin::from(p.PIN_20), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_17), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_16), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_11), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_9), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_10), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_8), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_22), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_21), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_18), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_19), gpio::Pull::Up),
+                        Input::new(AnyPin::from(p.PIN_5), gpio::Pull::Up),
+                    ))
+                    .unwrap()
+            });
+        },
+    );
 
     let executor0 = EXECUTOR0.init(Executor::new());
     info!("Initialized.");

src/stick.rs

@@ -882,6 +882,7 @@ pub fn calc_stick_values(angle: f32) -> (f32, f32) {
     (x, y)
 }
 
+#[inline(never)]
 #[link_section = ".time_critical.linearize"]
 pub fn linearize(point: f32, coefficients: &[f32; NUM_COEFFS]) -> f32 {
     coefficients[0] * (point * point * point)
@@ -890,6 +891,7 @@ pub fn linearize(point: f32, coefficients: &[f32; NUM_COEFFS]) -> f32 {
         + coefficients[3]
 }
 
+#[inline(never)]
 #[link_section = ".time_critical.notch_remap"]
 pub fn notch_remap(
     x_in: f32,

src/usb_comms.rs

@@ -0,0 +1,499 @@
+/**
+ * Communication with the console / PC over USB HID.
+ * Includes the HID report descriptor, and the GcReport struct.
+ */
+use core::{default::Default, future::Future};
+
+use defmt::{debug, info, trace, warn};
+use embassy_futures::join::join;
+use embassy_rp::{
+    peripherals::{PIN_25, PIN_29, PWM_SLICE4, PWM_SLICE6, USB},
+    pwm::Pwm,
+    usb::Driver as EmbassyDriver,
+};
+
+use embassy_sync::{blocking_mutex::raw::CriticalSectionRawMutex, mutex::Mutex, signal::Signal};
+use embassy_time::{Duration, Instant, Timer};
+use embassy_usb::{
+    class::hid::{HidReaderWriter, RequestHandler, State},
+    driver::Driver,
+    msos::{self, windows_version},
+    Builder, Handler, UsbDevice,
+};
+use libm::powf;
+
+use crate::{
+    config::{ControllerMode, InputConsistencyMode},
+    hid::{
+        gcc::{GcReportBuilder, GcState, GccRequestHandler, GCC_REPORT_DESCRIPTOR},
+        procon::{ProconReportBuilder, ProconRequestHandler, PROCON_REPORT_DESCRIPTOR},
+        xinput::{
+            XInputReaderWriter, XInputReportBuilder, XInputRequestHandler, XInputState,
+            XINPUT_REPORT_DESCRIPTOR,
+        },
+        HidReaderWriterSplit, UsbReader, UsbWriter,
+    },
+    input::CHANNEL_GCC_STATE,
+};
+
+pub static SIGNAL_RUMBLE: Signal<CriticalSectionRawMutex, bool> = Signal::new();
+
+/// We could turn the config change signal into a PubSubChannel instead, but that
+/// would just transmit unnecessary amounts of data.
+pub static SIGNAL_CHANGE_RUMBLE_STRENGTH: Signal<CriticalSectionRawMutex, u8> = Signal::new();
+
+/// Only dispatched ONCE after powerup, to determine how to advertise itself via USB.
+pub static MUTEX_INPUT_CONSISTENCY_MODE: Mutex<
+    CriticalSectionRawMutex,
+    Option<InputConsistencyMode>,
+> = Mutex::new(None);
+
+/// Only dispatched ONCE after powerup, to determine how to advertise itself via USB.
+pub static MUTEX_CONTROLLER_MODE: Mutex<CriticalSectionRawMutex, Option<ControllerMode>> =
+    Mutex::new(None);
+
+/// Vendor-defined property data
+const DEVICE_INTERFACE_GUID: &str = "{ecceff35-146c-4ff3-acd9-8f992d09acdd}";
+
+pub trait HidReportBuilder<const LEN: usize> {
+    async fn get_hid_report(&mut self, state: &GcState) -> [u8; LEN];
+}
+
+struct UsbConfig {
+    vid: u16,
+    pid: u16,
+    report_descriptor: &'static [u8],
+}
+
+impl From<ControllerMode> for UsbConfig {
+    fn from(value: ControllerMode) -> Self {
+        match value {
+            ControllerMode::GcAdapter => Self {
+                vid: 0x057e,
+                pid: 0x0337,
+                report_descriptor: GCC_REPORT_DESCRIPTOR,
+            },
+            ControllerMode::Procon => Self {
+                vid: 0x57e,
+                pid: 0x2009,
+                report_descriptor: PROCON_REPORT_DESCRIPTOR,
+            },
+            ControllerMode::XInput => Self {
+                vid: 0x045e,
+                pid: 0x028e,
+                report_descriptor: XINPUT_REPORT_DESCRIPTOR,
+            },
+        }
+    }
+}
+
+struct MyDeviceHandler {
+    configured: bool,
+}
+
+impl MyDeviceHandler {
+    fn new() -> Self {
+        MyDeviceHandler { configured: false }
+    }
+}
+
+impl Handler for MyDeviceHandler {
+    fn enabled(&mut self, enabled: bool) {
+        self.configured = true;
+
+        // reason: in production, info! compiles to nothing
+        #[allow(clippy::if_same_then_else)]
+        if enabled {
+            info!("Device enabled");
+        } else {
+            info!("Device disabled");
+        }
+    }
+
+    fn reset(&mut self) {
+        self.configured = false;
+        info!("Bus reset, the Vbus current limit is 100mA");
+    }
+
+    fn addressed(&mut self, addr: u8) {
+        self.configured = false;
+        info!("USB address set to: {}", addr);
+    }
+
+    fn configured(&mut self, configured: bool) {
+        self.configured = configured;
+        if configured {
+            info!(
+                "Device configured, it may now draw up to the configured current limit from Vbus."
+            )
+        } else {
+            info!("Device is no longer configured, the Vbus current limit is 100mA.");
+        }
+    }
+}
+
+fn mk_hid_reader_writer<'d, S, D, T, F, const R: usize, const W: usize>(
+    input_consistency_mode: InputConsistencyMode,
+    controller_mode: ControllerMode,
+    report_descriptor: &'d [u8],
+    mut builder: Builder<'d, D>,
+    state: &'d mut S,
+    mut init_func: F,
+) -> (
+    UsbDevice<'d, D>,
+    impl UsbReader<'d, D, R>,
+    impl UsbWriter<'d, D, W>,
+)
+where
+    D: Driver<'d>,
+    T: HidReaderWriterSplit<'d, D, R, W> + 'd,
+    F: FnMut(&mut Builder<'d, D>, &'d mut S, embassy_usb::class::hid::Config<'d>) -> T + 'd,
+{
+    let hid_config = embassy_usb::class::hid::Config {
+        report_descriptor,
+        request_handler: None,
+        poll_ms: if let ControllerMode::XInput = controller_mode {
+            1
+        } else {
+            match input_consistency_mode {
+                InputConsistencyMode::Original => 8,
+                InputConsistencyMode::ConsistencyHack
+                | InputConsistencyMode::SuperHack
+                | InputConsistencyMode::PC => 1,
+            }
+        },
+        max_packet_size_in: W as u16,
+        max_packet_size_out: R as u16,
+    };
+
+    let hid = init_func(&mut builder, state, hid_config);
+
+    let usb = builder.build();
+
+    let (reader, writer) = hid.split();
+
+    (usb, reader, writer)
+}
+
+#[allow(clippy::too_many_arguments)]
+fn mk_usb_transfer_futures<'d, S, D, H, F, Rq, T, const R: usize, const W: usize>(
+    input_consistency_mode: InputConsistencyMode,
+    controller_mode: ControllerMode,
+    usb_config: &UsbConfig,
+    request_handler: &'d mut Rq,
+    builder: Builder<'d, D>,
+    mut hid_report_builder: H,
+    state: &'d mut S,
+    init_func: F,
+) -> (
+    impl Future<Output = ()> + 'd,
+    impl Future<Output = ()> + 'd,
+    impl Future<Output = ()> + 'd,
+)
+where
+    D: Driver<'d> + 'd,
+    H: HidReportBuilder<W> + 'd,
+    Rq: RequestHandler,
+    T: HidReaderWriterSplit<'d, D, R, W> + 'd,
+    F: FnMut(&mut Builder<'d, D>, &'d mut S, embassy_usb::class::hid::Config<'d>) -> T + 'd,
+{
+    let (mut usb, reader, mut writer) = mk_hid_reader_writer(
+        input_consistency_mode,
+        controller_mode,
+        usb_config.report_descriptor,
+        builder,
+        state,
+        init_func,
+    );
+
+    let usb_fut = async move {
+        loop {
+            usb.run_until_suspend().await;
+            debug!("Suspended");
+            usb.wait_resume().await;
+            debug!("RESUMED!");
+        }
+    };
+
+    let in_fut = async move {
+        let mut gcc_subscriber = CHANNEL_GCC_STATE.subscriber().unwrap();
+
+        let mut last_report_time = Instant::now();
+        let mut rate_limit_end_time = Instant::now();
+
+        loop {
+            // This is what we like to call a "hack".
+            // It forces reports to be sent at least every 8.33ms instead of every 8ms.
+            // 8.33ms is a multiple of the game's frame interval (16.66ms), so if we
+            // send a report every 8.33ms, it should (in theory) ensure (close to)
+            // 100% input accuracy.
+            //
+            // From the console's perspective, we are basically a laggy adapter, taking
+            // a minimum of 333 extra us to send a report every time it's polled, but it
+            // works to our advantage.
+            if controller_mode != ControllerMode::XInput {
+                match input_consistency_mode {
+                    InputConsistencyMode::SuperHack | InputConsistencyMode::ConsistencyHack => {
+                        // "Ticker at home", so we can use this for both consistency and SuperHack mode
+                        Timer::at(rate_limit_end_time).await;
+                    }
+                    InputConsistencyMode::Original | InputConsistencyMode::PC => {}
+                }
+            }
+
+            writer.ready().await;
+
+            let state = gcc_subscriber.next_message_pure().await;
+
+            let report = hid_report_builder.get_hid_report(&state).await;
+
+            trace!("Writing report: {:08b}", report);
+
+            match writer.write(&report).await {
+                Ok(()) => {
+                    let currtime = Instant::now();
+                    let polltime = currtime.duration_since(last_report_time);
+                    let micros = polltime.as_micros();
+                    debug!("Report written in {}us", micros);
+                    if input_consistency_mode != InputConsistencyMode::Original
+                        && input_consistency_mode != InputConsistencyMode::PC
+                        && controller_mode != ControllerMode::XInput
+                    {
+                        while rate_limit_end_time < currtime {
+                            rate_limit_end_time += Duration::from_micros(8333);
+                        }
+                    }
+                    last_report_time = currtime;
+                }
+                Err(e) => warn!("Failed to send report: {:?}", e),
+            }
+        }
+    };
+
+    let out_fut = async move {
+        trace!("Readery loop");
+        reader.run(true, request_handler).await;
+    };
+
+    let usb_fut_wrapped = async {
+        usb_fut.await;
+        debug!("USB FUT DED");
+    };
+
+    (usb_fut_wrapped, in_fut, out_fut)
+}
+
+#[embassy_executor::task]
+pub async fn usb_transfer_task(raw_serial: [u8; 8], driver: EmbassyDriver<'static, USB>) {
+    let input_consistency_mode = {
+        while MUTEX_INPUT_CONSISTENCY_MODE.lock().await.is_none() {
+            Timer::after(Duration::from_millis(100)).await;
+        }
+        MUTEX_INPUT_CONSISTENCY_MODE.lock().await.unwrap()
+    };
+
+    let controller_mode = {
+        while MUTEX_CONTROLLER_MODE.lock().await.is_none() {
+            Timer::after(Duration::from_millis(100)).await;
+        }
+
+        MUTEX_CONTROLLER_MODE.lock().await.unwrap()
+    };
+
+    let config = UsbConfig::from(controller_mode);
+
+    let mut serial_buffer = [0u8; 64];
+
+    let serial = format_no_std::show(
+        &mut serial_buffer,
+        format_args!(
+            "{:02X}{:02X}{:02X}{:02X}{:02X}{:02X}{:02X}{:02X}",
+            raw_serial[0],
+            raw_serial[1],
+            raw_serial[2],
+            raw_serial[3],
+            raw_serial[4],
+            raw_serial[5],
+            raw_serial[6],
+            raw_serial[7]
+        ),
+    )
+    .unwrap();
+
+    info!("Detected flash with unique serial number {}", serial);
+
+    trace!("Start of config");
+    let mut usb_config = embassy_usb::Config::new(config.vid, config.pid);
+    usb_config.manufacturer = Some("Naxdy");
+    usb_config.product = Some(if controller_mode == ControllerMode::XInput {
+        "NaxGCC (XInput Mode)"
+    } else {
+        match input_consistency_mode {
+            InputConsistencyMode::Original => "NaxGCC (OG Mode)",
+            InputConsistencyMode::ConsistencyHack => "NaxGCC (Consistency Mode)",
+            InputConsistencyMode::SuperHack => "NaxGCC (SuperHack Mode)",
+            InputConsistencyMode::PC => "NaxGCC (PC Mode)",
+        }
+    });
+    usb_config.serial_number = Some(serial);
+    usb_config.max_power = 200;
+    usb_config.max_packet_size_0 = 64;
+    usb_config.device_class = if controller_mode == ControllerMode::XInput {
+        0xff
+    } else {
+        0
+    };
+    usb_config.device_protocol = 0;
+    usb_config.self_powered = false;
+    usb_config.device_sub_class = if controller_mode == ControllerMode::XInput {
+        0xff
+    } else {
+        0
+    };
+    usb_config.supports_remote_wakeup = true;
+    usb_config.device_release = if controller_mode == ControllerMode::XInput {
+        0x0572
+    } else {
+        0x0010
+    };
+
+    let mut config_descriptor = [0; 256];
+    let mut bos_descriptor = [0; 256];
+    let mut msos_descriptor = [0; 256];
+    let mut control_buf = [0; 64];
+
+    let mut device_handler = MyDeviceHandler::new();
+
+    let mut builder = Builder::new(
+        driver,
+        usb_config,
+        &mut config_descriptor,
+        &mut bos_descriptor,
+        &mut msos_descriptor,
+        &mut control_buf,
+    );
+
+    builder.msos_descriptor(windows_version::WIN8_1, 2);
+
+    let msos_writer = builder.msos_writer();
+    msos_writer.device_feature(msos::CompatibleIdFeatureDescriptor::new("WINUSB", ""));
+    msos_writer.device_feature(msos::RegistryPropertyFeatureDescriptor::new(
+        "DeviceInterfaceGUID",
+        msos::PropertyData::Sz(DEVICE_INTERFACE_GUID),
+    ));
+
+    builder.handler(&mut device_handler);
+
+    match controller_mode {
+        ControllerMode::GcAdapter => {
+            let mut state = State::new();
+
+            let mut request_handler = GccRequestHandler;
+
+            let (usb_fut_wrapped, in_fut, out_fut) = mk_usb_transfer_futures(
+                input_consistency_mode,
+                controller_mode,
+                &config,
+                &mut request_handler,
+                builder,
+                GcReportBuilder::default(),
+                &mut state,
+                HidReaderWriter::<_, 5, 37>::new,
+            );
+
+            join(usb_fut_wrapped, join(in_fut, out_fut)).await;
+        }
+        ControllerMode::Procon => {
+            let mut state = State::new();
+
+            let mut request_handler = ProconRequestHandler;
+
+            let (usb_fut_wrapped, in_fut, out_fut) = mk_usb_transfer_futures(
+                input_consistency_mode,
+                controller_mode,
+                &config,
+                &mut request_handler,
+                builder,
+                ProconReportBuilder::default(),
+                &mut state,
+                HidReaderWriter::<_, 64, 64>::new,
+            );
+
+            join(usb_fut_wrapped, join(in_fut, out_fut)).await;
+        }
+        ControllerMode::XInput => {
+            let mut state = XInputState::new();
+
+            let mut request_handler = XInputRequestHandler;
+
+            let (usb_fut_wrapped, in_fut, out_fut) = mk_usb_transfer_futures(
+                input_consistency_mode,
+                controller_mode,
+                &config,
+                &mut request_handler,
+                builder,
+                XInputReportBuilder,
+                &mut state,
+                XInputReaderWriter::<_, 32, 32>::new,
+            );
+
+            join(usb_fut_wrapped, join(in_fut, out_fut)).await;
+        }
+    };
+}
+
+fn calc_rumble_power(strength: u8) -> u16 {
+    if strength > 0 {
+        powf(2.0, 7.0 + ((strength as f32 - 3.0) / 8.0)) as u16
+    } else {
+        0
+    }
+}
+
+#[embassy_executor::task]
+pub async fn rumble_task(
+    pin_rumble: PIN_25,
+    pin_brake: PIN_29,
+    pwm_ch_rumble: PWM_SLICE4,
+    pwm_ch_brake: PWM_SLICE6,
+) {
+    let mut rumble_config: embassy_rp::pwm::Config = Default::default();
+    rumble_config.top = 255;
+    rumble_config.enable = true;
+    rumble_config.compare_b = 0;
+
+    let mut brake_config = rumble_config.clone();
+    brake_config.compare_b = 255;
+
+    let mut pwm_rumble = Pwm::new_output_b(pwm_ch_rumble, pin_rumble, rumble_config.clone());
+    let mut pwm_brake = Pwm::new_output_b(pwm_ch_brake, pin_brake, brake_config.clone());
+
+    let mut rumble_power = {
+        let strength = SIGNAL_CHANGE_RUMBLE_STRENGTH.wait().await;
+        calc_rumble_power(strength)
+    };
+
+    loop {
+        let new_rumble_status = SIGNAL_RUMBLE.wait().await;
+
+        debug!("Received rumble signal: {}", new_rumble_status);
+
+        if let Some(new_strength) = SIGNAL_CHANGE_RUMBLE_STRENGTH.try_take() {
+            rumble_power = calc_rumble_power(new_strength);
+        }
+
+        if new_rumble_status {
+            rumble_config.compare_b = rumble_power;
+            brake_config.compare_b = 0;
+
+            pwm_rumble.set_config(&rumble_config);
+            pwm_brake.set_config(&brake_config);
+        } else {
+            rumble_config.compare_b = 0;
+            brake_config.compare_b = 255;
+
+            pwm_rumble.set_config(&rumble_config);
+            pwm_brake.set_config(&brake_config);
+        }
+    }
+}