RTCx fails to start until power is removed.

[snoopy20]

New issue found, unsure if I can resolve this one!

I have found the RTC1 may on rare occasion lock up, no love of resets, playing with LFSRC or RTC registers will make it count.

What will rectify the situation is if power is completely removed from the NRF52810 chip.

But this is a problem, due to leakage on the board I can only force the power off when the level drops somewhat and this takes the supercaps connected upstream a while.

I'm wondering therefore if there's some hidden code that can completely reset the RTC peripheral, much like there is for the ADC? If so I'd like to give it a go.

[hmolesworth]

This may work, worth a try; I tested his a while back (not officially documented):

 // Power off
 *(volatile uint32_t *)(  NRF_RTC1_BASE+0xFFC) = 0; //   RTC1 Power Enable - turn off

 ... wait a bit

 // Power on
 *(volatile uint32_t *)(  NRF_RTC1_BASE+0xFFC) = 1; //   RTC1 Power Enable - turn on

[snoopy20]

Very nice, I'll try it for sure!