remove need for critical section dependency

Author: liamkinne

Cargo.toml

@@ -20,7 +20,6 @@ vcell = "0.1"
 static_assertions = "1.1"
 fugit = "0.3.5"
 stm32-usbd = { version = "0.7.0", optional = true }
-critical-section = "1.1.2"
 fixed = { version = "1.28.0", optional = true }
 
 [dependencies.cortex-m]

src/usb.rs

@@ -56,7 +56,7 @@ unsafe impl<Dm: DmPin + Send, Dp: DpPin + Send> UsbPeripheral for Peripheral<Dm,
     const EP_MEMORY_ACCESS_2X16: bool = true;
 
     fn enable() {
-        critical_section::with(|_| unsafe {
+        cortex_m::interrupt::free(|_| unsafe {
             let rcc_ptr = &(*RCC::ptr());
             USB::enable(rcc_ptr);
             USB::reset(rcc_ptr);