Timer 2 not working with Softdevice

RE: Timer 2 not working with Softdevice

Stefan Birnir Sverrisson — Thu, 29 Oct 2015 06:18:00 GMT

Hi sowmya

I recommend to accept the answer that you feel is adequate for your original question and post a new question in a new thread. That will give you a better chance of getting an answer for you second question and help others that have a similar question to find the answer.

RE: Timer 2 not working with Softdevice

Martijn — Wed, 28 Oct 2015 07:09:23 GMT

Sorry, can't help you with this. I never used the app_timer library, I always used the timer directly.

RE: Timer 2 not working with Softdevice

sowmya — Wed, 28 Oct 2015 05:18:59 GMT

Now I changed the timer interrupt to 100 ms and initialised application timer to 10ms i.e., using

APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_MAX_TIMERS,
					APP_TIMER_OP_QUEUE_SIZE, false);

where,

#define APP_TIMER_PRESCALER             327
#define APP_TIMER_MAX_TIMERS            4
#define APP_TIMER_OP_QUEUE_SIZE         5

Now I created one timer instance and set the time for every 10 ms using,

app_timer_start(ulTestTimer, 1, NULL);

This case I am getting the interrupt . I have put BP inside callback function and it is in repeated mode.

But the same configuration is working when I star the timer with value 5 i.e., for 50ms. What can be the cause ?

RE: Timer 2 not working with Softdevice

sowmya — Wed, 28 Oct 2015 05:03:28 GMT

Thank you Martijn, I don't know how I left that point. Yes I checked the signals, I am getting 250 ms interrupt.

RE: Timer 2 not working with Softdevice

Martijn — Tue, 27 Oct 2015 20:29:22 GMT

The prescaler only accepts the values 0-9. 16000000/2^9=31250 Hz. With a cc value of 7813 it will result in ~250ms interrupts

RE: Timer 2 not working with Softdevice

Petter Myhre — Tue, 27 Oct 2015 14:02:28 GMT

When you use the SoftDevice you should use the sd_* functions. You should enable set the interrupt priority and enable it with:

err_code = sd_nvic_SetPriority(TIMER2_IRQn, APP_IRQ_PRIORITY_LOW);
APP_ERROR_CHECK(err_code);

err_code = sd_nvic_EnableIRQ(TIMER2_IRQn);
APP_ERROR_CHECK(err_code);

RE: Timer 2 not working with Softdevice

sowmya — Tue, 27 Oct 2015 13:26:08 GMT

I could not check the exact interrupt interval on DSO , but it may be around 220 milli seconds. I am keeping a counter in ISR and I am getting value 9 for 2 seconds.

RE: Timer 2 not working with Softdevice

Wojtek — Tue, 27 Oct 2015 13:21:15 GMT

How often do you get interrupts? 1/~16secs ? Reference manual says: When fTIMER <= 1 MHz the TIMER will use PCLK1M instead of PCLK16M for reduced power consumption.