52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
|
|
||
|
|
#include "cmsis_os.h" // CMSIS RTOS header file
|
||
|
|
|
||
|
|
/*----------------------------------------------------------------------------
|
||
|
|
* Semaphore creation & usage
|
||
|
|
*---------------------------------------------------------------------------*/
|
||
|
|
|
||
|
|
void Thread_Semaphore (void const *argument); // thread function
|
||
|
|
osThreadId tid_Thread_Semaphore; // thread id
|
||
|
|
osThreadDef (Thread_Semaphore, osPriorityNormal, 1, 0); // thread object
|
||
|
|
|
||
|
|
osSemaphoreId sid_Thread_Semaphore; // semaphore id
|
||
|
|
osSemaphoreDef (SampleSemaphore); // semaphore object
|
||
|
|
|
||
|
|
|
||
|
|
int Init_Semaphore (void) {
|
||
|
|
|
||
|
|
sid_Thread_Semaphore = osSemaphoreCreate (osSemaphore(SampleSemaphore), 1);
|
||
|
|
if (!sid_Thread_Semaphore) {
|
||
|
|
; // Semaphore object not created, handle failure
|
||
|
|
}
|
||
|
|
|
||
|
|
tid_Thread_Semaphore = osThreadCreate (osThread(Thread_Semaphore), NULL);
|
||
|
|
if (!tid_Thread_Semaphore) return(-1);
|
||
|
|
|
||
|
|
return(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void Thread_Semaphore (void const *argument) {
|
||
|
|
int32_t val;
|
||
|
|
|
||
|
|
while (1) {
|
||
|
|
; // Insert thread code here...
|
||
|
|
|
||
|
|
val = osSemaphoreWait (sid_Thread_Semaphore, 10); // wait 10 mSec
|
||
|
|
switch (val) {
|
||
|
|
case osOK:
|
||
|
|
; // Use protected code here...
|
||
|
|
osSemaphoreRelease (sid_Thread_Semaphore); // Return a token back to a semaphore
|
||
|
|
break;
|
||
|
|
case osErrorResource:
|
||
|
|
break;
|
||
|
|
case osErrorParameter:
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
osThreadYield (); // suspend thread
|
||
|
|
}
|
||
|
|
}
|