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stm32/usb: add support for 32bit usbram.

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This commit is contained in:
Dario Nieuwenhuis 2023-04-06 18:50:53 +02:00
parent 52cab3a9f4
commit 9f28d80977
2 changed files with 87 additions and 48 deletions
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4
embassy-stm32/Cargo.toml
View file

@ -60,7 +60,7 @@ sdio-host = "0.5.0"
embedded-sdmmc = { git = "https://github.com/embassy-rs/embedded-sdmmc-rs", rev = "46d1b1c2ff13e31e282ec1e352421721694f126a", optional = true }
critical-section = "1.1"
atomic-polyfill = "1.0.1"
stm32-metapac = "3"
stm32-metapac = "4"
vcell = "0.1.3"
bxcan = "0.7.0"
nb = "1.0.0"
@ -75,7 +75,7 @@ critical-section = { version = "1.1", features = ["std"] }
[build-dependencies]
proc-macro2 = "1.0.36"
quote = "1.0.15"
stm32-metapac = { version = "3", default-features = false, features = ["metadata"]}
stm32-metapac = { version = "4", default-features = false, features = ["metadata"]}
[features]
default = ["stm32-metapac/rt"]

131
embassy-stm32/src/usb/usb.rs
View file

@ -12,22 +12,29 @@ use embassy_usb_driver as driver;
use embassy_usb_driver::{
Direction, EndpointAddress, EndpointAllocError, EndpointError, EndpointInfo, EndpointType, Event, Unsupported,
};
use pac::common::{Reg, RW};
use pac::usb::vals::{EpType, Stat};
use super::{DmPin, DpPin, Instance};
use crate::gpio::sealed::AFType;
use crate::interrupt::InterruptExt;
use crate::pac::usb::regs;
use crate::pac::usb::vals::{EpType, Stat};
use crate::pac::USBRAM;
use crate::rcc::sealed::RccPeripheral;
use crate::{pac, Peripheral};
use crate::Peripheral;
const EP_COUNT: usize = 8;
#[cfg(any(usb_v1_x1, usb_v1_x2))]
const EP_MEMORY_SIZE: usize = 512;
#[cfg(not(any(usb_v1_x1, usb_v1_x2)))]
const EP_MEMORY_SIZE: usize = 1024;
#[cfg(any(usbram_16x1_512, usbram_16x2_512))]
const USBRAM_SIZE: usize = 512;
#[cfg(usbram_16x2_1024)]
const USBRAM_SIZE: usize = 1024;
#[cfg(usbram_32_2048)]
const USBRAM_SIZE: usize = 2048;
#[cfg(not(usbram_32_2048))]
const USBRAM_ALIGN: usize = 2;
#[cfg(usbram_32_2048)]
const USBRAM_ALIGN: usize = 4;
const NEW_AW: AtomicWaker = AtomicWaker::new();
static BUS_WAKER: AtomicWaker = NEW_AW;
@ -57,25 +64,60 @@ fn invariant(mut r: regs::Epr) -> regs::Epr {
r
}
fn align_len_up(len: u16) -> u16 {
((len as usize + USBRAM_ALIGN - 1) / USBRAM_ALIGN * USBRAM_ALIGN) as u16
}
// Returns (actual_len, len_bits)
fn calc_out_len(len: u16) -> (u16, u16) {
match len {
2..=62 => ((len + 1) / 2 * 2, ((len + 1) / 2) << 10),
63..=480 => ((len + 31) / 32 * 32, (((len + 31) / 32 - 1) << 10) | 0x8000),
// NOTE: this could be 2..=62 with 16bit USBRAM, but not with 32bit. Limit it to 60 for simplicity.
2..=60 => (align_len_up(len), align_len_up(len) / 2 << 10),
61..=1024 => ((len + 31) / 32 * 32, (((len + 31) / 32 - 1) << 10) | 0x8000),
_ => panic!("invalid OUT length {}", len),
}
}
fn ep_in_addr<T: Instance>(index: usize) -> Reg<u16, RW> {
T::regs().ep_mem(index * 4 + 0)
#[cfg(not(usbram_32_2048))]
mod btable {
use super::*;
pub(super) unsafe fn write_in<T: Instance>(index: usize, addr: u16) {
USBRAM.mem(index * 4 + 0).write_value(addr);
}
pub(super) unsafe fn write_in_len<T: Instance>(index: usize, _addr: u16, len: u16) {
USBRAM.mem(index * 4 + 1).write_value(len);
}
pub(super) unsafe fn write_out<T: Instance>(index: usize, addr: u16, max_len_bits: u16) {
USBRAM.mem(index * 4 + 2).write_value(addr);
USBRAM.mem(index * 4 + 3).write_value(max_len_bits);
}
pub(super) unsafe fn read_out_len<T: Instance>(index: usize) -> u16 {
USBRAM.mem(index * 4 + 3).read()
}
}
fn ep_in_len<T: Instance>(index: usize) -> Reg<u16, RW> {
T::regs().ep_mem(index * 4 + 1)
}
fn ep_out_addr<T: Instance>(index: usize) -> Reg<u16, RW> {
T::regs().ep_mem(index * 4 + 2)
}
fn ep_out_len<T: Instance>(index: usize) -> Reg<u16, RW> {
T::regs().ep_mem(index * 4 + 3)
#[cfg(usbram_32_2048)]
mod btable {
use super::*;
pub(super) unsafe fn write_in<T: Instance>(_index: usize, _addr: u16) {}
pub(super) unsafe fn write_in_len<T: Instance>(index: usize, addr: u16, len: u16) {
USBRAM.mem(index * 2).write_value((addr as u32) | ((len as u32) << 16));
}
pub(super) unsafe fn write_out<T: Instance>(index: usize, addr: u16, max_len_bits: u16) {
USBRAM
.mem(index * 2 + 1)
.write_value((addr as u32) | ((max_len_bits as u32) << 16));
}
pub(super) unsafe fn read_out_len<T: Instance>(index: usize) -> u16 {
(USBRAM.mem(index * 2 + 1).read() >> 16) as u16
}
}
struct EndpointBuffer<T: Instance> {
@ -87,23 +129,25 @@ struct EndpointBuffer<T: Instance> {
impl<T: Instance> EndpointBuffer<T> {
fn read(&mut self, buf: &mut [u8]) {
assert!(buf.len() <= self.len as usize);
for i in 0..((buf.len() + 1) / 2) {
let val = unsafe { T::regs().ep_mem(self.addr as usize / 2 + i).read() };
buf[i * 2] = val as u8;
if i * 2 + 1 < buf.len() {
buf[i * 2 + 1] = (val >> 8) as u8;
}
for i in 0..(buf.len() + USBRAM_ALIGN - 1) / USBRAM_ALIGN {
let val = unsafe { USBRAM.mem(self.addr as usize / USBRAM_ALIGN + i).read() };
let n = USBRAM_ALIGN.min(buf.len() - i * USBRAM_ALIGN);
buf[i * USBRAM_ALIGN..][..n].copy_from_slice(&val.to_le_bytes()[..n]);
}
}
fn write(&mut self, buf: &[u8]) {
assert!(buf.len() <= self.len as usize);
for i in 0..((buf.len() + 1) / 2) {
let mut val = buf[i * 2] as u16;
if i * 2 + 1 < buf.len() {
val |= (buf[i * 2 + 1] as u16) << 8;
}
unsafe { T::regs().ep_mem(self.addr as usize / 2 + i).write_value(val) };
for i in 0..(buf.len() + USBRAM_ALIGN - 1) / USBRAM_ALIGN {
let mut val = [0u8; USBRAM_ALIGN];
let n = USBRAM_ALIGN.min(buf.len() - i * USBRAM_ALIGN);
val[..n].copy_from_slice(&buf[i * USBRAM_ALIGN..][..n]);
#[cfg(not(usbram_32_2048))]
let val = u16::from_le_bytes(val);
#[cfg(usbram_32_2048)]
let val = u32::from_le_bytes(val);
unsafe { USBRAM.mem(self.addr as usize / USBRAM_ALIGN + i).write_value(val) };
}
}
}
@ -139,8 +183,7 @@ impl<'d, T: Instance> Driver<'d, T> {
#[cfg(stm32l5)]
unsafe {
crate::peripherals::PWR::enable();
pac::PWR.cr2().modify(|w| w.set_usv(true));
crate::pac::PWR.cr2().modify(|w| w.set_usv(true));
}
unsafe {
@ -256,8 +299,9 @@ impl<'d, T: Instance> Driver<'d, T> {
}
fn alloc_ep_mem(&mut self, len: u16) -> u16 {
assert!(len as usize % USBRAM_ALIGN == 0);
let addr = self.ep_mem_free;
if addr + len > EP_MEMORY_SIZE as _ {
if addr + len > USBRAM_SIZE as _ {
panic!("Endpoint memory full");
}
self.ep_mem_free += len;
@ -306,10 +350,7 @@ impl<'d, T: Instance> Driver<'d, T> {
let addr = self.alloc_ep_mem(len);
trace!(" len_bits = {:04x}", len_bits);
unsafe {
ep_out_addr::<T>(index).write_value(addr);
ep_out_len::<T>(index).write_value(len_bits);
}
unsafe { btable::write_out::<T>(index, addr, len_bits) }
EndpointBuffer {
addr,
@ -321,13 +362,11 @@ impl<'d, T: Instance> Driver<'d, T> {
assert!(!ep.used_in);
ep.used_in = true;
let len = (max_packet_size + 1) / 2 * 2;
let len = align_len_up(max_packet_size);
let addr = self.alloc_ep_mem(len);
unsafe {
ep_in_addr::<T>(index).write_value(addr);
// ep_in_len is written when actually TXing packets.
}
// ep_in_len is written when actually TXing packets.
unsafe { btable::write_in::<T>(index, addr) }
EndpointBuffer {
addr,
@ -398,7 +437,7 @@ impl<'d, T: Instance> driver::Driver<'d> for Driver<'d, T> {
w.set_ctrm(true);
});
#[cfg(usb_v3)]
#[cfg(any(usb_v3, usb_v4))]
regs.bcdr().write(|w| w.set_dppu(true))
}
@ -633,12 +672,12 @@ impl<'d, T: Instance, D> Endpoint<'d, T, D> {
fn write_data(&mut self, buf: &[u8]) {
let index = self.info.addr.index();
self.buf.write(buf);
unsafe { ep_in_len::<T>(index).write_value(buf.len() as _) };
unsafe { btable::write_in_len::<T>(index, self.buf.addr, buf.len() as _) }
}
fn read_data(&mut self, buf: &mut [u8]) -> Result<usize, EndpointError> {
let index = self.info.addr.index();
let rx_len = unsafe { ep_out_len::<T>(index).read() as usize } & 0x3FF;
let rx_len = unsafe { btable::read_out_len::<T>(index) as usize } & 0x3FF;
trace!("READ DONE, rx_len = {}", rx_len);
if rx_len > buf.len() {
return Err(EndpointError::BufferOverflow);