Use portable-atomic

Author: romancardenas

Cargo.toml

@@ -13,10 +13,12 @@ rust-version = "1.59"
 [dependencies]
 embedded-hal = { version = "0.2.6", features = ["unproven"] }
 nb = "1.0.0"
-atomic-polyfill = "1.0.2"
 riscv = { version = "0.10.1", features = ["critical-section-single-hart"] }
 e310x = { version = "0.11.0", features = ["rt", "critical-section"] }
 
+[target.'cfg(not(target_has_atomic = "32"))'.dependencies]
+portable-atomic = { version = "1.4", default-features = false, features = ["unsafe-assume-single-core"] }
+
 [features]
 g002 = ["e310x/g002"]
 virq = []

src/gpio.rs

@@ -1,8 +1,12 @@
 //! General Purpose I/O
 
-use atomic_polyfill::{AtomicU32, Ordering};
 use core::marker::PhantomData;
 
+#[cfg(target_has_atomic = "32")]
+use core::sync::atomic::{AtomicU32, Ordering};
+#[cfg(not(target_has_atomic = "32"))]
+use portable_atomic::{AtomicU32, Ordering};
+
 /// GpioExt trait extends the GPIO0 peripheral.
 pub trait GpioExt {
     /// The parts to split the GPIO into.