NRF51 Timer 2 accuracy

RE: NRF51 Timer 2 accuracy

Ron — Wed, 26 Oct 2016 19:34:40 GMT

I managed a way to verify the timer value on my event trigger and those seem to be consistent. That leads me to believe that the jitter is the ppi failing to be accurate in setting the gpio signal to high.

RE: NRF51 Timer 2 accuracy

Susheel Nuguru — Wed, 26 Oct 2016 06:55:34 GMT

You can that anytime after enabling softdevice (SD) since you are coordinating well with SD by using its API. remember to release it before going to low power and request again on wakeup else your sleep current will be high.

RE: NRF51 Timer 2 accuracy

Ron — Tue, 25 Oct 2016 14:30:10 GMT

At what point would be best to start this? I am using bluetooth as well. I have the following before i start advertising and start my application loop.

sd_clock_hfclk_is_running(&err_code);

if (!err_code) {
    sd_clock_hfclk_request();
}

RE: NRF51 Timer 2 accuracy

Susheel Nuguru — Tue, 25 Oct 2016 07:33:38 GMT

start the HF Crystal oscillator. If you are using internal RC for HFCLK, it will be less accurate. Do this by

NRF_CLOCK->TASKS_HFCLKSTART = 1;
while(0 == NRF_CLOCK->EVENTS_HFCLKSTARTED);