Hardware interrupt with FreeRTOS binary semaphore. An alternative solution to a polling task is to use a hardware interrupt for teh button and have either the polling task block on an event from the ISR, or have the ISR give the semaphore directly - in either case you will have to deal with debounce. UART Interrupts in FreeRTOS with. ARM Cortex-M, Interrupts and FreeRTOS: Part 1. Posted on August 14, 2016 by Erich Styger. For example an interrupt with 2.1 can nest/interrupt a running interrupt 3.0. The Subpriority is used when multiple interrupts with the same Preemption Priority are pending, then the one with the lower sub-priority (higher urgency) will be executed.
Here we will discuss some of the most frequently used APIs related to tasks.
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.
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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 Gpio
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 Queue Uart
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.