nrf_drv_timer and sleep

RE: nrf_drv_timer and sleep

SentinelLighting — Wed, 06 Feb 2019 12:40:54 GMT

Thanks Ashish, between your help and doing a bunch more reading I realized I can can configure the RTC for using the RC option. This is not optimal for using the BLE, but at this point the board is built without a XTAL!

RE: nrf_drv_timer and sleep

Ashish — Wed, 06 Feb 2019 06:06:45 GMT

Hey,

To use RTC(Real Time Counter), you only need to configure Low Frequency Clock Source.

If your board doesn't have an external Low Frequency Oscillator, you can use internal Low Frequency RC oscillator or synthesize the Low Frequency clock from the main oscillator.

Please take a look at the product specification of the specific device that you are using for more information.

All the documentation is available here

RE: nrf_drv_timer and sleep

SentinelLighting — Tue, 05 Feb 2019 19:18:09 GMT

Ashish - the PCB has no 32768 RTC oscillator. It only has the main crystal. Are you saying I can remap the internal RTC to be run from the main oscillator?

RE: nrf_drv_timer and sleep

Ashish — Tue, 05 Feb 2019 05:21:47 GMT

Hey,

nrf51 and nrf52 devices have inbuilt RTC(Real Time Counter). There is no need of an external RTC, so you should be able to use app_timer for waking up the CPU.