how to stop a timer ?

RE: how to stop a timer ?

sgabran — Mon, 12 Oct 2020 14:19:45 GMT

thanks a lot, all the best

RE: how to stop a timer ?

Jørgen Holmefjord — Mon, 12 Oct 2020 14:11:33 GMT

I would recommend you to have a look at the examples in this post.

RE: how to stop a timer ?

sgabran — Mon, 12 Oct 2020 14:07:38 GMT

Hi Jorgen

Thanks a lot for the advice. I am trying to do the connection between timer-0 counts and counter-1 using PPI channel-3 (assuming this is the right way to do it)

I believe this line will monitor the compare event on timer-0.

What is it the command to use to trigger the counts on counter-1 ?

many thanks

compare_event_addr_3 = nrf_drv_timer_event_address_get(&Timer_0, NRF_TIMER_EVENT_COMPARE0);

RE: how to stop a timer ?

Jørgen Holmefjord — Mon, 12 Oct 2020 09:27:13 GMT

Hi,

You have two options to do this:

Enable interrupts for the timer events. Increment a counter in the event handler, when it reaches 512, stop the timer. This approach may not work well for high-frequency timers, as the interrupt latency may cause additional pulses to be clocked out before you are able to stop the timer.
Use a second timer in COUNT mode. Connect the COMPARE event of the clock-generating timer to the COUNT task of the second timer. Set he CC register of the counting-timer to the number of clock cycles you want to stop the first timer at, then connect the COMPARE event from the counting timer to the STOP task of the clock-generating timer.

Best regards,
Jørgen