Add methods to use semaphore from ISR (#52)

lobaro · Mar 21, 2023 · 21bf3be · 21bf3be
1 parent 091340a
commit 21bf3be
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diff --git a/freertos-rust/src/semaphore.rs b/freertos-rust/src/semaphore.rs
@@ -1,4 +1,5 @@
 use crate::base::*;
+use crate::isr::*;
 use crate::shim::*;
 use crate::units::*;
 
@@ -59,6 +60,16 @@ impl Semaphore {
  Ok(())
  }
  }
+
+ /// Returns `true` on success, `false` when semaphore count already reached its limit
+ pub fn give_from_isr(&self, context: &mut InterruptContext) -> bool {
+ unsafe { freertos_rs_give_semaphore_isr(self.semaphore, context.get_task_field_mut()) == 0 }
+ }
+
+ /// Returns `true` on success, `false` if the semaphore was not successfully taken because it was not available
+ pub fn take_from_isr(&self, context: &mut InterruptContext) -> bool {
+ unsafe { freertos_rs_take_semaphore_isr(self.semaphore, context.get_task_field_mut()) == 0 }
+ }
 }
 
 impl Drop for Semaphore {

diff --git a/freertos-rust/src/shim.rs b/freertos-rust/src/shim.rs
@@ -38,6 +38,15 @@ extern "C" {
  pub fn freertos_rs_give_mutex(mutex: FreeRtosQueueHandle) -> FreeRtosBaseType;
  pub fn freertos_rs_give_recursive_mutex(mutex: FreeRtosQueueHandle) -> FreeRtosBaseType;
 
+ pub fn freertos_rs_take_semaphore_isr(
+ semaphore: FreeRtosQueueHandle,
+ xHigherPriorityTaskWoken: FreeRtosBaseTypeMutPtr,
+ ) -> FreeRtosBaseType;
+ pub fn freertos_rs_give_semaphore_isr(
+ semaphore: FreeRtosQueueHandle,
+ xHigherPriorityTaskWoken: FreeRtosBaseTypeMutPtr,
+ ) -> FreeRtosBaseType;
+
  pub fn freertos_rs_delete_semaphore(mutex: FreeRtosQueueHandle);
 
  pub fn freertos_rs_create_binary_semaphore() -> FreeRtosQueueHandle;