the timer is 6 times faster

RE: the timer is 6 times faster

Edvin — Wed, 29 Apr 2020 14:53:26 GMT

what does nrf_drv_timer_ms_to_ticks() return when you set 1, 2 and >2? E.g. 3 or 10?

RE: the timer is 6 times faster

msquizzato — Wed, 29 Apr 2020 13:57:37 GMT

I use default (16 MHz)

nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
err_code = nrf_drv_timer_init(&TIMER_SYS, &timer_cfg, timer_sys_event_handler);

the strange thing is that if set TIMER_PERIOD to 1ms OK 2ms OK, > 2ms the time is wrong

time_ticks = nrf_drv_timer_ms_to_ticks(&TIMER_SYS, TIMER_PERIOD);
nrf_drv_timer_extended_compare(
&TIMER_SYS, NRF_TIMER_CC_CHANNEL0, time_ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
nrf_drv_timer_enable(&TIMER_SYS);

What could it be?

I would need it at 10ms but for this problem I set it at 2ms

RE: the timer is 6 times faster

Edvin — Wed, 29 Apr 2020 13:45:22 GMT

Are you sure you are seeing 6 times the speed, and not 8 or 4? The reason I ask is because it sounds like a prescaler setting. Check out the example in SDK\examples\peripheral\timer.

My guess is that during your porting, you have missed some sdk_config.h definitions or something.

Try to debug nrf_drv_timer_init() and see if the number of ticks set is correct, and if it is not, why it is not set correctly.

BR,

Edvin