Timer event capture clarification

RE: Timer event capture clarification

Nick_RA — Thu, 09 Apr 2020 10:47:57 GMT

This works, thanks.

(@haakonsh thanks, but the GPIO is only for a test, to check the sample rate is as expected)

RE: Timer event capture clarification

haakonsh — Wed, 08 Apr 2020 11:05:14 GMT

[quote user="DmitryZ"]Also you can toggle a pin with GPIOTE module, without waking up CPU at all.[/quote]

The PPI — Programmable peripheral interconnect can connect any event from any peripheral to any task of any peripheral. In your case, you'll want to connect the CC[0] event to a GPIOTE channel's OUT task.

Read the PPI and GPIOTE chapters in the Product specification, and study the examples/peripheral/ppi example.

RE: Timer event capture clarification

Dmitry — Tue, 07 Apr 2020 18:27:57 GMT

Hi,

your interrupt handler takes some time, that's why frequency is lower. Instead of restarting timer in interrupt handler, add a shortcut for clearing it by COMPARE[0] event (timer is not stopped on CLEAR task):

NRF_TIMER4->SHORTS = TIMER_SHORTS_COMPARE0_CLEAR_Msk;

Also you can toggle a pin with GPIOTE module, without waking up CPU at all.