RE: Peripheral Timer Example - Timing inconsistent across different boards

Bob Recny — Fri, 26 Oct 2018 17:36:25 GMT

All boards are now giving a solid 2.000 sec interval.

Thanks!

RE: Peripheral Timer Example - Timing inconsistent across different boards

Einar Thorsrud — Fri, 26 Oct 2018 08:21:39 GMT

Hi,

There is nothing else going on in this example, so the timing is deterministic (in clock cycles) even if you don't use PPI. The problem is likely that you are using the internal RC oscillator instead of the crystal oscillator, as that is not started in the TIMER example.

The cleanest way to start it is via the Clock driver, as that can be used regardless of whether you use the SoftDevice or not. You can modify the Timer example from SDK 15.2 as shown by this diff:

devzone.nordicsemi.com/.../main.c.diff

Note that you also need to update the sdk_config.h file as shown below and add nrf_drv_clock.c and nrfx_clock.c to the project in order to use the clock driver.

devzone.nordicsemi.com/.../sdk_5F00_config.h.diff