piezo buzzer has to generate sound until event occurs

[DMS]

i successfully generated sound using pwm and piezo buzzer

while(/*while event occurs*/)
{
	for (uint8_t i = 0; i < 50; ++i)
	{
		value = (i < 20) ? (i * 5) : (100 - (i - 20) * 5);
		/* Set the duty cycle - keep trying until PWM is ready... */
		while (app_pwm_channel_duty_set(&PWM1, 0, value) == 
	}
}

how to turn off the sound, if i given any flag it is not coming out of the while .

[Kyle Krueger]

It looks like your event has a lower priority than the while loop.

If this is the case, you have an architecture problem. You could use the quick and dirty fix of moving this loop to a lower priority, but I would recommend some extra changes.

My suggestion would be to set up the buzzer on a timed event with low priority. You can turn on this timed event where you see fit, and turn it off in the event you are waiting for.

Again, the priority of your event should be higher than that of your timer.

[DMS]

event is triggered from application, u mean to say :- start timer when event is triggered from mobile application and stop timer when request to stop from mobile app. ?

[Kyle Krueger]

Yeah, depending on your use case you can start and stop it where needed. The timer then replaces the while loop where the deadlock is hit.

[DMS]

I am trying to replace while loop with timer, i have used simple timer example as reference. due to some reason connection is getting disconnected. What shall i do?

[Kyle Krueger]

I expect this is due to both the timer having too high of a priority and the for loop being a rather long callback in the timer. This might be causing a timeout in the BLE stack.

First check the priority of your timed event, and try setting it to 5 or lower. Second, try removing the for loop from your code too, and instead increment the value in each timer event.

P.s. this might be justified as a second question.

[DMS]

can i use two timers ?