Breaking change: portable-atomic (#922)

* Atomics: Replace polyfill with portable-atomic

* Update Cargo.lock for examples

* RTIC: portable-atomic: Update changelog

* rtic-monotonics: portable-atomic: Update changelog

* lm3s6965: enable critical-section when testing

* xtask: Enable portable-atomic/critical-section

When dealing with rtic-monotonics

* rtic-monotonics: portable-atomics: Do not disable the ability to fallback

---------

Co-authored-by: Emil Fresk <emil.fresk@gmail.com>

rtic-monotonics/CHANGELOG.md

@@ -17,6 +17,7 @@ For each category, *Added*, *Changed*, *Fixed* add new entries at the top!
 
 ### Changed
 
+- Replace `atomic-polyfill` with `portable-atomic`
 - Rework all timers based on `rtic-time 2.0.0`
 - Most timer tick rates are now configurable
 - Tweak `build.rs` to avoid warnings in Nightly 1.78+

rtic-monotonics/Cargo.toml

@@ -36,7 +36,7 @@ rustdoc-flags = ["--cfg", "docsrs"]
 [dependencies]
 rtic-time = { version = "2.0.0", path = "../rtic-time" }
 fugit = { version = "0.3.6" }
-atomic-polyfill = "1"
+portable-atomic = { version = "1" }
 cfg-if = "1.0.0"
 cortex-m = { version = "0.7.6", optional = true }
 critical-section = { version = "1", optional = true }

rtic-monotonics/src/imxrt.rs

@@ -26,7 +26,7 @@
 //! }
 //! ```
 
-use atomic_polyfill::{AtomicU32, Ordering};
+use portable_atomic::{AtomicU32, Ordering};
 use rtic_time::{
     half_period_counter::calculate_now,
     timer_queue::{TimerQueue, TimerQueueBackend},

rtic-monotonics/src/nrf/rtc.rs

@@ -61,7 +61,7 @@ pub use nrf5340_net_pac::{self as pac, RTC0_NS as RTC0, RTC1_NS as RTC1};
 #[doc(hidden)]
 pub use nrf9160_pac::{self as pac, RTC0_NS as RTC0, RTC1_NS as RTC1};
 
-use atomic_polyfill::{AtomicU32, Ordering};
+use portable_atomic::{AtomicU32, Ordering};
 use rtic_time::{
     half_period_counter::calculate_now,
     timer_queue::{TimerQueue, TimerQueueBackend},

rtic-monotonics/src/nrf/timer.rs

@@ -71,7 +71,7 @@ pub use nrf5340_net_pac::{
 #[doc(hidden)]
 pub use nrf9160_pac::{self as pac, TIMER0_NS as TIMER0, TIMER1_NS as TIMER1, TIMER2_NS as TIMER2};
 
-use atomic_polyfill::{AtomicU32, Ordering};
+use portable_atomic::{AtomicU32, Ordering};
 use rtic_time::{
     half_period_counter::calculate_now,
     timer_queue::{TimerQueue, TimerQueueBackend},

rtic-monotonics/src/stm32.rs

@@ -51,7 +51,7 @@ pub mod prelude {
     pub use fugit::{self, ExtU64, ExtU64Ceil};
 }
 
-use atomic_polyfill::{AtomicU64, Ordering};
+use portable_atomic::{AtomicU64, Ordering};
 use rtic_time::{
     half_period_counter::calculate_now,
     timer_queue::{TimerQueue, TimerQueueBackend},

rtic-monotonics/src/systick.rs

@@ -42,17 +42,17 @@ pub mod prelude {
 
 pub use cortex_m::peripheral::SYST;
 
-use atomic_polyfill::Ordering;
+use portable_atomic::Ordering;
 use rtic_time::timer_queue::TimerQueue;
 
 use crate::TimerQueueBackend;
 
 cfg_if::cfg_if! {
     if #[cfg(feature = "systick-64bit")] {
-        use atomic_polyfill::AtomicU64;
+        use portable_atomic::AtomicU64;
         static SYSTICK_CNT: AtomicU64 = AtomicU64::new(0);
     } else {
-        use atomic_polyfill::AtomicU32;
+        use portable_atomic::AtomicU32;
         static SYSTICK_CNT: AtomicU32 = AtomicU32::new(0);
     }
 }