Starting the timer without BLE

[Jed Marti]

Situation: SES, SDK 16, nRF52832

I'm developing a pre-production test program without BLE. I'm using APP_TIMER_V2 and noticed that the timer events do not not happen even after following the BLE example code. It turns out there's some legacy calls in the BLE startup that make the timer work. The sequence of calls that seem to work is:

app_timer_init();

app_timer_create(&mTM, APP_TIMER_MODE_REPEATED, eventHandler);

nrf_drv_clock_init();

nrf_drv_clock_lfclk_request(NULL);

app_timer_start(mTM,  ..., NULL);

Now the repeated events happen. The 2 nrf_drv_clock calls were hidden in BLE startup code.

[Jørgen Holmefjord]

Hi,

This is not "hidden" in the BLE startup, but it is just a consequence of the softdevice keeping the low frequency clock active at all times whenever it is enabled (in order to wakeup at specific intervals to handle tasks).

RTC/app_timer also requires the LFCLK to be running, this is described in the application timer tutorial.

Best regards,
Jørgen