Use portable-atomic instead of atomic-polyfill

Author: BjornTheProgrammer

embassy-rp/CHANGELOG.md

@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add reset_to_usb_boot for rp235x ([#4705](https://github.com/embassy-rs/embassy/pull/4705))
 - Add fix #4822 in PIO onewire. Change to disable the state machine before setting y register ([#4824](https://github.com/embassy-rs/embassy/pull/4824))
 - Add PIO::Ws2812 color order support
+- Remove unused deprecated atomic-polyfill crate from Cargo.toml ([#4909](https://github.com/embassy-rs/embassy/pull/4909))
 
 ## 0.8.0 - 2025-08-26
 
@@ -115,4 +116,3 @@ Small release fixing a few gnarly bugs, upgrading is strongly recommended.
 - rename the Channel trait to Slice and the PwmPin to PwmChannel
 - i2c: Fix race condition that appears on fast repeated transfers.
 - Add a basic "read to break" function
-

embassy-rp/Cargo.toml

@@ -47,7 +47,7 @@ rt = [ "rp-pac/rt" ]
 defmt = ["dep:defmt", "embassy-usb-driver/defmt", "embassy-hal-internal/defmt"]
 ## Enable log support
 log = ["dep:log"]
-## Enable chrono support  
+## Enable chrono support
 chrono = ["dep:chrono"]
 
 ## Configure the [`critical-section`](https://docs.rs/critical-section) crate to use an implementation that is safe for multicore use on rp2040.
@@ -159,7 +159,7 @@ embassy-futures = { version = "0.1.2", path = "../embassy-futures" }
 embassy-hal-internal = { version = "0.3.0", path = "../embassy-hal-internal", features = ["cortex-m", "prio-bits-2"] }
 embassy-embedded-hal = { version = "0.5.0", path = "../embassy-embedded-hal" }
 embassy-usb-driver = { version = "0.2.0", path = "../embassy-usb-driver" }
-atomic-polyfill = "1.0.1"
+portable-atomic = "1"
 defmt = { version = "1.0.1", optional = true }
 log = { version = "0.4.14", optional = true }
 nb = "1.1.0"

embassy-rp/src/pio/mod.rs

@@ -5,12 +5,12 @@ use core::pin::Pin as FuturePin;
 use core::sync::atomic::{Ordering, compiler_fence};
 use core::task::{Context, Poll};
 
-use atomic_polyfill::{AtomicU8, AtomicU64};
 use embassy_hal_internal::{Peri, PeripheralType};
 use embassy_sync::waitqueue::AtomicWaker;
 use fixed::FixedU32;
 use fixed::types::extra::U8;
 use pio::{Program, SideSet, Wrap};
+use portable_atomic::{AtomicU8, AtomicU64};
 
 use crate::dma::{self, Channel, Transfer, Word};
 use crate::gpio::{self, AnyPin, Drive, Level, Pull, SealedPin, SlewRate};

embassy-rp/src/uart/buffered.rs

@@ -2,8 +2,8 @@
 use core::future::Future;
 use core::slice;
 
-use atomic_polyfill::AtomicU8;
 use embassy_hal_internal::atomic_ring_buffer::RingBuffer;
+use portable_atomic::AtomicU8;
 
 use super::*;
 

embassy-rp/src/uart/mod.rs

@@ -3,12 +3,12 @@ use core::future::poll_fn;
 use core::marker::PhantomData;
 use core::task::Poll;
 
-use atomic_polyfill::{AtomicU16, Ordering};
 use embassy_futures::select::{Either, select};
 use embassy_hal_internal::{Peri, PeripheralType};
 use embassy_sync::waitqueue::AtomicWaker;
 use embassy_time::{Delay, Timer};
 use pac::uart::regs::Uartris;
+use portable_atomic::{AtomicU16, Ordering};
 
 use crate::clocks::clk_peri_freq;
 use crate::dma::{AnyChannel, Channel};