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stm32: Add breadcrumb to i2cv1 investigation

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Adds an in-code breadcrumb for https://github.com/embassy-rs/embassy/issues/2372
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James Munns 2023-12-28 23:57:10 +01:00 committed by GitHub
parent 47a94f22aa
commit a780339103
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1 changed files with 17 additions and 0 deletions
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embassy-stm32/src/i2c/v1.rs
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@ -1,3 +1,9 @@
//! # I2Cv1
//!
//! This implementation is used for STM32F1, STM32F2, STM32F4, and STM32L1 devices.
//!
//! All other devices (as of 2023-12-28) use [`v2`](super::v2) instead.
use core::future::poll_fn;
use core::task::Poll;
@ -10,6 +16,17 @@ use crate::dma::Transfer;
use crate::pac::i2c;
use crate::time::Hertz;
// /!\ /!\
// /!\ Implementation note! /!\
// /!\ /!\
//
// It's somewhat unclear whether using interrupts here in a *strictly* one-shot style is actually
// what we want! If you are looking in this file because you are doing async I2C and your code is
// just totally hanging (sometimes), maybe swing by this issue:
// <https://github.com/embassy-rs/embassy/issues/2372>.
//
// There's some more details there, and we might have a fix for you. But please let us know if you
// hit a case like this!
pub unsafe fn on_interrupt<T: Instance>() {
let regs = T::regs();
// i2c v2 only woke the task on transfer complete interrupts. v1 uses interrupts for a bunch of