external 32.768K start up question

RE: external 32.768K start up question

Vidar Berg — Fri, 05 Jun 2020 07:15:59 GMT

They can register a callback when they call nrf_drv_clock_lfclk_request() which will get invoked when the clock has started. Note that the event registers are cleared inside the clock driver.

RE: external 32.768K start up question

William.wei — Fri, 05 Jun 2020 01:33:10 GMT

Thank you Berg, i understand what you said, is there any API interface for customer to use , instead of register

RE: external 32.768K start up question

Vidar Berg — Tue, 02 Jun 2020 11:24:48 GMT

Hello,

As you said, it only checks if the LF clock is running or not. Not what the clock source is. If you want that you can wait for the LF clock started event instead, as explained in the PS. I think the main point here is to actually have a running LF clock before starting the app timer and not what the clock source is. It should be ok to run the RTC of the less accurate RC while waiting for the crystal to ramp up.