Freertos Interrupt Example
Here we will discuss some of the most frequently used APIs related to tasks.
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If xQueueSendToFrontFromISR sets this value to pdTRUE then a context switch should be requested before the interrupt is exited. From FreeRTOS V7.3.0 pxHigherPriorityTaskWoken is an optional parameter and can be set to NULL.
SysTick is the default time base. Of course, any other timer interrupt can be used instead. For example, for low power applications, I’m using a special low power timer instead. And if enabling the FreeRTOS trace facility to measure task execution time, an extra timer might be needed. Your SPI interrupt is above the maximum for FreeRTOS, which means it cannot use FreeRTOS APIs. Lower your SPI priority to something below the SYSCALL priority (which is 0xbf or priority 11, STM32 only uses the high 4 bits). Any interrupt which uses FreeRTOS APIs must be at a lower priority than the SYSCALL. For example, if you have an interrupt and you don't want to do a lot of processing inside the interrupt, you can use a helper task. To accomplish this, you can perform a semaphore give operation inside the interrupt, and a dedicated ask will sleep or block on xSemaphoreGet operation. In the depicted example, it is assumed that the application switches on an LCD back-light when a key is pressed, and that the back-light remains on until 5 seconds pass without any keys being pressed. Timer 1 is used to switch off the LCD back-light when this 5 seconds has elapsed.
xTaskCreate(): This interface is used to create a new Task, if the task is successfully created then it returns pdPass(1) or else errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY(-1). Check this link for more details.
vTaskDelay(): This function is used to delay/block the task for specified delay time(ticks). INCLUDE_vTaskDelay needs to be set to 1 in FreeRtosConfig.h file for using this function. Check this link for more details.
vTaskDelete():This function is used to delete as task. We need to pass the taskHandle of the task to be deleted.To delete the own task we should pass NULL as the parameter. Please check this link for more details.
vTaskSuspend(): This function is used to Suspend a task, the suspended remains in the same state util it is resumed.For this, we need to pass the handle of the tasks that needs to be suspended. Passing NULL will suspend own task. Check this link for more details.
Freertos Interrupt Example For Resume
vTaskResume(): This function is used to resume a suspended task. If the Resumed task has higher priority than the running task then it will preempt the running task or else stays in ready stateFor this, we need to pass the handle of the task to be resumed. Check this link for more details.
Freertos Interrupt Example Template
xTaskResumeFromISR(): This function is used to resume a task from ISR.For this, we need to pass the handle of the task to be resumed. Check this link for more details.