esp32c3 support

rtic-sync/CHANGELOG.md

@@ -3,7 +3,7 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-For each category, *Added*, *Changed*, *Fixed* add new entries at the top!
+For each category, _Added_, _Changed_, _Fixed_ add new entries at the top!
 
 ## [Unreleased]
 
@@ -13,6 +13,10 @@ For each category, *Added*, *Changed*, *Fixed* add new entries at the top!
 
 ### Fixed
 
+## [v1.0.3]
+
+- `portable-atomic` used as a drop in replacement for `core::sync::atomic` in code and macros. `portable-atomic` imported with `default-features = false`, as we do not require CAS.
+
 ## [v1.0.2] - 2023-08-29
 
 ### Fixed
@@ -25,6 +29,6 @@ For each category, *Added*, *Changed*, *Fixed* add new entries at the top!
 
 - `make_channel` could be UB
 
-## [v1.0.0] - 2023-05-31 - yanked 
+## [v1.0.0] - 2023-05-31 - yanked
 
 - Initial release

rtic-sync/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rtic-sync"
-version = "1.0.2"
+version = "1.0.3"
 
 edition = "2021"
 authors = [
@@ -20,6 +20,7 @@ license = "MIT OR Apache-2.0"
 heapless = "0.7"
 critical-section = "1"
 rtic-common = { version = "1.0.0", path = "../rtic-common" }
+portable-atomic = { version = "1", default-features = false }
 
 [dev-dependencies]
 tokio = { version = "1", features = ["rt", "macros", "time"] }

rtic-sync/src/arbiter.rs

@@ -27,8 +27,8 @@ use core::cell::UnsafeCell;
 use core::future::poll_fn;
 use core::ops::{Deref, DerefMut};
 use core::pin::Pin;
-use core::sync::atomic::{fence, AtomicBool, Ordering};
 use core::task::{Poll, Waker};
+use portable_atomic::{fence, AtomicBool, Ordering};
 
 use rtic_common::dropper::OnDrop;
 use rtic_common::wait_queue::{Link, WaitQueue};

rtic-sync/src/channel.rs

@@ -108,7 +108,7 @@ macro_rules! make_channel {
         static mut CHANNEL: $crate::channel::Channel<$type, $size> =
             $crate::channel::Channel::new();
 
-        static CHECK: ::core::sync::atomic::AtomicU8 = ::core::sync::atomic::AtomicU8::new(0);
+        static CHECK: $crate::portable_atomic::AtomicU8 = $crate::portable_atomic::AtomicU8::new(0);
 
         $crate::channel::critical_section::with(|_| {
             if CHECK.load(::core::sync::atomic::Ordering::Relaxed) != 0 {

rtic-sync/src/lib.rs

@@ -5,6 +5,7 @@
 
 pub mod arbiter;
 pub mod channel;
+pub use portable_atomic;
 
 #[cfg(test)]
 #[macro_use]