Hi,
My NRF52840DK (pca10056 1.1.0 2019.9) would not reset when I press its Reset button. The issue is very similar to https://devzone.nordicsemi.com/f/nordic-q-a/38555/reset-button-doesn-t-work-on-some-nrf52840-dk-pca10056-1-0-0-boards, but it's not exactly the same:
- holding down the button while switching the board off/on makes LED 5 blink slowly
- when I press the button, I do get a 30 ms active low pulse on P0.18
- CONFIG_GPIO_AS_PINRESET is among the project's Preprocessor Definitions / Options / Common
- nrfjprog --memrd 0x10001200 --w 32 --n 8 displays 0x015 (decimal 21) instead of the required 0x012 (decimal 18), as per mentioned post:
- my system_nrf52840.c file (SDK 15.3) reads:
#if defined (CONFIG_GPIO_AS_PINRESET)
if (((NRF_UICR->PSELRESET[0] & UICR_PSELRESET_CONNECT_Msk) != (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos)) ||
((NRF_UICR->PSELRESET[1] & UICR_PSELRESET_CONNECT_Msk) != (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos))){
NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
NRF_UICR->PSELRESET[0] = 18;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
NRF_UICR->PSELRESET[1] = 18;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
NVIC_SystemReset();
}
#endif
So everything mentioned in that post seems to be fine, but the board still would not reset. A second board (same 1.1.0 2019.9 but different lot) behaves the same way.
Please advise,
Andrei
