chip immediatelly wakes up after entering system off

RE: chip immediatelly wakes up after entering system off

ovrebekk — Fri, 26 Aug 2022 11:23:53 GMT

Hi Pepam

You should change the rst variable to uint32_t, otherwise you will not be able to store the full value of the register. If you do this and run the test again you should get a different result.

Best regards
Torbjørn

RE: chip immediatelly wakes up after entering system off

Pepam — Fri, 26 Aug 2022 05:56:11 GMT

Hello ovrebekk,

I have commented out the line which was responsible for sense setup and chip was still waking up immediatelly. I checked resetreas, and I can read value 4 after powering the board up, but than I can read 0 every time it immediatelly resets. This is how I do resetreas register reset:

    int main(){
        uint8_t rst = 0;
        log_init();
        rst = NRF_POWER->RESETREAS;
        NRF_LOG_INFO("RESET REASON : %d", rst);
        NRF_POWER->RESETREAS = rst;
        ...
    }

RE: chip immediatelly wakes up after entering system off

ovrebekk — Wed, 24 Aug 2022 11:27:16 GMT

Hi Pepam

Do you know if the wakeup is related to the GPIO sense configuration?

To check this you can try to comment out the sense setup in your code, and see if you still get a wakeup right away.

To check why the wakeup occurred you can check the NRF_POWER->RESETREAS register after the reset. Bit 16 indicates that the reset was triggered by a pin detect in system off.

Best regards
Torbjørn