stm32f4/examples: add config and linker script so they're runnable.

embassy-stm32f4-examples/.cargo/config

@@ -0,0 +1,28 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "probe-run --chip STM32F411CEUx --defmt"
+
+rustflags = [
+  # LLD (shipped with the Rust toolchain) is used as the default linker
+  "-C", "link-arg=--nmagic",
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
+
+  # if you run into problems with LLD switch to the GNU linker by commenting out
+  # this line
+  # "-C", "linker=arm-none-eabi-ld",
+
+  # if you need to link to pre-compiled C libraries provided by a C toolchain
+  # use GCC as the linker by commenting out both lines above and then
+  # uncommenting the three lines below
+  # "-C", "linker=arm-none-eabi-gcc",
+  # "-C", "link-arg=-Wl,-Tlink.x",
+  # "-C", "link-arg=-nostartfiles",
+
+  # Code-size optimizations.
+  "-Z", "trap-unreachable=no",
+  "-C", "inline-threshold=5",
+  "-C", "no-vectorize-loops",
+]
+
+[build]
+target = "thumbv7em-none-eabi"

embassy-stm32f4-examples/build.rs

@@ -0,0 +1,31 @@
+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+}

embassy-stm32f4-examples/memory.x

@@ -0,0 +1,5 @@
+MEMORY
+{
+  FLASH : ORIGIN = 0x08000000, LENGTH = 64K 
+  RAM : ORIGIN = 0x20000000, LENGTH = 32K
+}

embassy-stm32f4-examples/src/bin/exti.rs

@@ -0,0 +1,59 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use example_common::{panic, *};
+
+use cortex_m::singleton;
+use cortex_m_rt::entry;
+use embassy::executor::{task, Executor};
+use embassy::gpio::*;
+use embassy::util::Forever;
+use embassy_stm32f4::exti;
+use embassy_stm32f4::exti::*;
+use embassy_stm32f4::interrupt;
+use embassy_stm32f4::serial;
+use futures::pin_mut;
+use stm32f4xx_hal::serial::config::Config;
+use stm32f4xx_hal::stm32;
+use stm32f4xx_hal::syscfg;
+use stm32f4xx_hal::{prelude::*, serial::config};
+
+static EXTI: Forever<exti::ExtiManager> = Forever::new();
+
+#[task]
+async fn run(dp: stm32::Peripherals, cp: cortex_m::Peripherals) {
+    let gpioa = dp.GPIOA.split();
+
+    let button = gpioa.pa0.into_pull_up_input();
+
+    let exti = EXTI.put(exti::ExtiManager::new(dp.EXTI, dp.SYSCFG.constrain()));
+    let pin = exti.new_pin(button, interrupt::take!(EXTI0));
+    pin_mut!(pin);
+
+    info!("Starting loop");
+
+    loop {
+        pin.as_mut().wait_for_rising_edge().await;
+        info!("edge detected!");
+    }
+}
+
+static EXECUTOR: Forever<Executor> = Forever::new();
+
+#[entry]
+fn main() -> ! {
+    let dp = stm32::Peripherals::take().unwrap();
+    let cp = cortex_m::peripheral::Peripherals::take().unwrap();
+
+    let executor = EXECUTOR.put(Executor::new(cortex_m::asm::sev));
+    executor.spawn(run(dp, cp)).unwrap();
+
+    loop {
+        executor.run();
+        //cortex_m::asm::wfe(); // wfe causes RTT to stop working on stm32
+    }
+}

embassy-stm32f4-examples/src/bin/hello.rs

@@ -0,0 +1,40 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use example_common::{panic, *};
+
+use cortex_m::singleton;
+use cortex_m_rt::entry;
+use embassy::executor::{task, Executor};
+use embassy::uart::Uart;
+use embassy::util::Forever;
+use embassy_stm32f4::interrupt;
+use embassy_stm32f4::serial;
+use stm32f4xx_hal::serial::config::Config;
+use stm32f4xx_hal::stm32;
+use stm32f4xx_hal::{prelude::*, serial::config};
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    let p = stm32f4xx_hal::stm32::Peripherals::take().unwrap();
+    let gpioa = p.GPIOA.split();
+    let gpioc = p.GPIOC.split();
+
+    let mut led = gpioc.pc13.into_push_pull_output();
+    let button = gpioa.pa0.into_pull_up_input();
+    led.set_low().unwrap();
+
+    loop {
+        if button.is_high().unwrap() {
+            led.set_low().unwrap();
+        } else {
+            led.set_high().unwrap();
+        }
+    }
+}

embassy-stm32f4-examples/src/bin/serial.rs

@@ -64,6 +64,6 @@ fn main() -> ! {
 
     loop {
         executor.run();
-        cortex_m::asm::wfe();
+        //cortex_m::asm::wfe(); // wfe causes RTT to stop working on stm32
     }
 }