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fix boot loop due to wrong value read from REGOUT0 #367

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Merged
hathach merged 1 commit into from
Dec 4, 2025
Merged

fix boot loop due to wrong value read from REGOUT0 #367

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12 changes: 10 additions & 2 deletions src/boards/boards.c
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,12 @@ void board_init(void) {
// #define UICR_REGOUT0_VALUE UICR_REGOUT0_VOUT_3V3
// in board.h when using that power configuration.
#ifdef UICR_REGOUT0_VALUE
// for some reason bellow condition is true even though debugger show 3.0V
// pyocd> rw 0x10001304
// 10001304: fffffffc
// it leads to infinite boot loop. Let wait for NVM to be ready first.
NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
if ((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) == (UICR_REGOUT0_VOUT_DEFAULT << UICR_REGOUT0_VOUT_Pos)){
NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
Expand All @@ -119,8 +125,10 @@ void board_init(void) {

NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}

NVIC_SystemReset();
// to avoid infinity boot loop reset only if REGOUT0 was set correctly
if((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) == (UICR_REGOUT0_VALUE << UICR_REGOUT0_VOUT_Pos)){
NVIC_SystemReset();
}
}
#endif

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