RE: gpiote with softdevice in sdk8.1 not work

kk — Fri, 19 Feb 2016 01:49:20 GMT

Thank you for your fast reply!

It is exactly the same as what you said. After setting:

1.set the third parameter(compare value) of nrf_drv_timer_extended_compare() to less than 65535.

2.change TIMER1_CONFIG_FREQUENCY to NRF_TIMER_FREQ_1MHz

the timer runs, and gpiote and ppi also work fine without any change.

Thank you very much!

RE: gpiote with softdevice in sdk8.1 not work

Einar Thorsrud — Thu, 18 Feb 2016 12:18:09 GMT

The reason for this is probably that TIMER1 and TIMER2 is 16 bit, whereas TIMER0 is 32 bit. In the call to nrf_drv_timer_extended_compare(), the third parameter is the compare value. In the example this is 200*1000, which is more than 16 bits, as ceil(log2(200*1000)) = 18. If you change it to 50*1000 instead, you should see the LEDs blink as expected, though four times faster.

Remember to change TIMER1_CONFIG_FREQUENCY to NRF_TIMER_FREQ_1MHz in nrf_drv_config.h in your project (same as for TIMER0) if you have not already done so, as it NRF_TIMER_FREQ_16MHz by default. You can also set it to NRF_TIMER_FREQ_250kHz, which would result in the same LED blink frequency as you got with a compare value of 200*1000 and the 1 MHz timer.