[20] RTC: Register values are invalid

Symptoms

RTC registers will not contain the correct/expected value if read.

Conditions

The RTC has been idle.

Consequences

RTC configuration cannot be determined by reading RTC registers.

Workaround

 
NRF_CLOCK->EVENTS_LFCLKSTARTED  = 0;
NRF_CLOCK->TASKS_LFCLKSTART     = 1;
while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0) {}
NRF_RTC0->TASKS_STOP = 0;