Measuring task execution time with vApplicationTickHook()

Kernel
1

swammaws wrote on Friday, July 15, 2016:

Hi,
I wanted to ask how can I measure the created task execution time with vApplicationTickHook(). It gets called at tick but what should I do to calculate task execution time

Regards,

swam

2

richard_damon wrote on Friday, July 15, 2016:

You may want to look at http://www.freertos.org/rtos-run-time-stats.html which talks about the build in faciltiy to measure task execution time.

3

swammaws wrote on Saturday, July 16, 2016:

Thanks for the reply.Actually the problem is like rhis
there are two tasks one with higher priority and and heavy and otherwithl low priority just printing at some regular interval and i wanted to find exection of both jobs that will occur at some intervals in milliseconds.Is it possible with to meaausre with tickhook?

4

rtel wrote on Saturday, July 16, 2016:

It would be hard to do that with the tick hook as it is not what the
hook is for, so it does not have access to the information necessary.

As Richard Damon has already highlighted, there is a run time stats
facility which will give you the total amount of time each task is
consuming. If you what the run time for individual executions then you
could use the trace hook macros
http://www.freertos.org/rtos-trace-macros.html - specifically the
traceTASK_SWITCHED_IN() or traceTASK_SWITCHED_OUT macros - where the
pxCurrentTCB variable is available to you so you know which task is
being switched in or out (depending on the macro you define). A similar
thread:
https://sourceforge.net/p/freertos/discussion/382005/thread/d20f4bf7/

5

swammaws wrote on Saturday, July 16, 2016:

ok thnks alot. Sorry Im new to freeRtos and I have one more thing to ask. I want to change the priority of task I created in main . in some other task as in mycase priority set task and I was having problem that when I do it the following way it doest give any output Am I doing it right?

BaseType_t yReturned;
TaskHandle_t communication_handle = NULL; //outside main

int main
{
.// new code
yReturned = xTaskCreate((pdTASK_CODE)communication, (signed char *)"Communication", configMINIMAL_STACK_SIZE, NULL, 1, &communication_handle);

zReturned = xTaskCreate((pdTASK_CODE)priorityset_task, (signed char *)"Priorityset", configMINIMAL_STACK_SIZE, NULL, 5, &priorityset_handle);
//
.........
}

Now wht i m doing is using handler of communication task not inside main but Priorityset one

I am setting the priority of communication task to new value as follows

static void priorityset_task()
{
	
while (1)
{

vTaskPrioritySet(communication_handle, 2);



}



}

Is it the right way to use handler or I need to do something else?

Thanks

6

rtel wrote on Saturday, July 16, 2016:

Looks right.