Hands-On RTOS with Microcontrollers

Task A (highest priority)

Task A is responsible for blinking the green LED, but only after semPtr has been taken (within 200 ms of requesting it). The following excerpt has been taken from mainSemPriorityInversion.c:

while(1){    //'take' the semaphore with a 200mS timeout    SEGGER_SYSVIEW_PrintfHost("attempt to take semPtr");    if(xSemaphoreTake(semPtr, 200/portTICK_PERIOD_MS) == pdPASS)    {        RedLed.Off();        SEGGER_SYSVIEW_PrintfHost("received semPtr");        blinkTwice(&GreenLed);        xSemaphoreGive(semPtr);    }    else    {        //this code is called when the         //semaphore wasn't taken in time        SEGGER_SYSVIEW_PrintfHost("FAILED to receive "                                    "semphr in time");        RedLed.On();    }    //sleep for a bit to let other tasks run    vTaskDelay(StmRand(10,30));}

This task is the primary focal ...