51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
#include "cmsis_os2.h" // CMSIS RTOS header file
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/*----------------------------------------------------------------------------
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* Semaphore creation & usage
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*---------------------------------------------------------------------------*/
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osSemaphoreId_t sid_Semaphore; // semaphore id
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osThreadId_t tid_Thread_Semaphore; // thread id
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void Thread_Semaphore (void *argument); // thread function
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int Init_Semaphore (void) {
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sid_Semaphore = osSemaphoreNew(2U, 2U, NULL);
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if (sid_Semaphore == NULL) {
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; // Semaphore object not created, handle failure
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}
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tid_Thread_Semaphore = osThreadNew(Thread_Semaphore, NULL, NULL);
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if (tid_Thread_Semaphore == NULL) {
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return(-1);
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}
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return(0);
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}
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void Thread_Semaphore (void *argument) {
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int32_t val;
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while (1) {
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; // Insert thread code here...
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val = osSemaphoreAcquire(sid_Semaphore, 10U); // wait 10 mSec
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switch (val) {
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case osOK:
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; // Use protected code here...
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osSemaphoreRelease(sid_Semaphore); // return a token back to a semaphore
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break;
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case osErrorResource:
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break;
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case osErrorParameter:
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break;
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default:
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break;
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}
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osThreadYield(); // suspend thread
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}
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}
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