Update critical_section dependency.

Cargo.toml

@@ -18,7 +18,7 @@ links = "cortex-m"  # prevent multiple versions of this crate to be linked toget
 
 [dependencies]
 bitfield = "0.13.2"
-critical-section = { version = "0.3", optional = true }
+critical-section = "0.3"
 embedded-hal = "0.2.4"
 volatile-register = "0.2.0"
 
@@ -32,7 +32,7 @@ cm7 = []
 cm7-r0p1 = ["cm7"]
 linker-plugin-lto = []
 std = []
-single-core-critical-section = ["critical-section", "critical-section/token-bool"]
+single-core-critical-section = ["critical-section/token-u8"]
 
 [workspace]
 members = [

src/critical_section.rs

@@ -8,20 +8,23 @@ mod single_core_critical_section {
     struct SingleCoreCriticalSection;
     set_impl!(SingleCoreCriticalSection);
 
+    const TOKEN_IGNORE: RawToken = 0;
+    const TOKEN_REENABLE: RawToken = 1;
+
     unsafe impl Impl for SingleCoreCriticalSection {
         unsafe fn acquire() -> RawToken {
             match primask::read() {
                 Primask::Active => {
                     interrupt::disable();
-                    true
+                    TOKEN_REENABLE
                 }
-                Primask::Inactive => false,
+                Primask::Inactive => TOKEN_IGNORE,
             }
         }
 
-        unsafe fn release(primask_was_active: RawToken) {
+        unsafe fn release(token: RawToken) {
             // Only re-enable interrupts if they were enabled before the critical section.
-            if primask_was_active {
+            if token == TOKEN_REENABLE {
                 interrupt::enable()
             }
         }