Way to cancel TASK_STOP (PWM driver)

RE: Way to cancel TASK_STOP (PWM driver)

Susheel Nuguru — Thu, 16 Jan 2020 09:31:11 GMT

Triggering any TASKS would start set of actions within the hardware like requesting/releasing resources (like clocks etc) which cannot be undone and brought back to the state as it was before. So I can confirm that you can safely think that once doing a TASKS_STOP your app needs to wait until you get the event that the stop is finished.

RE: Way to cancel TASK_STOP (PWM driver)

AOF — Wed, 15 Jan 2020 23:55:37 GMT

Hi Susheel,

Ok, I just wanted to confirm there was no way of canceling a task that was already triggered.

I will need to handle it in my code then.

Thanks for the confirmation!

AOF

RE: Way to cancel TASK_STOP (PWM driver)

Susheel Nuguru — Wed, 15 Jan 2020 09:45:45 GMT

[quote user=""]I've tried writing 0 to my_pwm.p_registers->TASKS_STOP but this does not seem to have any effect.[/quote]

After triggering the STOP TASK, i do not see anyway of stopping this. I strongly recommend you not to pursue this direction.

The problem seems to be that your application logic is starting the new PWM action before the previous one stop has completed. In this scenario, the proper way, according to me, is to fix your application logic, that it could wait until the STOP_TASK has finished its work and the interrupt is triggered for EVENT_STOP.