Issue with TIMER in soft device S132

[GK]

Dear Sir,

I  am new to Nordic. This is my first query. It is related to running Timer with softdevice. I am using TIMER1 ( as const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(1);)

I could run the application in the <SDK>\examples\peripheral\timer successfully. Here I have used  the  following

uint32_t time_ms = 1*60*1000;

This corresponds to 1 minute(60seconds).

It works fine without softdevice.

By actual code is along with softdevice. So I tried to use the same code there with the soft device.

Here I was expecting the  'timer_led_event_handler()' to be called every 1 minute(60 secoonds)

Here the  interrupt handler is getting called, but it is called at  faster rate ( not in every 1 minute). .

Is it some issue related to clock configuration?

Anyone , Please let me know what/where I went wrong?

Thank you.

[Jørgen Holmefjord]

Nguyen Hoan Hoang: TIMER1 is not used by the softdevice or SDK. Application timer library use RTC1 as its timer source.

GK: How did you configure the timer? How often is the timeout handler called? Which SDK version are you using? I would not recommend using a timer for 1 minute intervals, app_timer or RTC would be a better alternative, as it runs on lower frequency clock source, giving you lower accuracy but also much lower current consumption.

[Jørgen Holmefjord]

If you run a timer at highest frequency (16 MHz), the timer will overflow after ~4.47 minutes. What have you set the frequency (TIMER_DEFAULT_CONFIG_FREQUENCY) to in your sdk_config.h file? It also looks like you set time_ms to 10 seconds in your code, not 1 minute as you claim.

[GK]

Yes..I have modified and forgot to revert it.  Sorry for that.But it is not coming for every 10 seconds also.It is too fast .

Here the define statement is as follows

#define TIMER_DEFAULT_CONFIG_FREQUENCY 0. I think it is set to ' NRF_TIMER_FREQ_16MHz'.right?

[Jørgen Holmefjord]

If the timeout handler is called 20-30 times per second there is definitely something wrong. Can you check the value of time_ticks passed to nrf_drv_timer_extended_compare? Yes, if the config is set to 0, the timer should run at 16 MHz.

I would still recommend that you look into using app_timer for controlling your application. You can find a tutorial here. Plese note that there are some changes in newer SDKs.

[GK]

Hi, Currently I am trying to do the same with app_timer.Thank you for your suggestion