diff options
| -rw-r--r-- | ports/nrf/supervisor/port.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/ports/nrf/supervisor/port.c b/ports/nrf/supervisor/port.c index 36725293c..89797e6dc 100644 --- a/ports/nrf/supervisor/port.c +++ b/ports/nrf/supervisor/port.c @@ -131,6 +131,21 @@ safe_mode_t port_init(void) { analogin_init(); #endif + // If the board was reset by the WatchDogTimer, we may + // need to boot into safe mode. Reset the RESETREAS bit + // for the WatchDogTimer so we don't encounter this the + // next time we reboot. + if (NRF_POWER->RESETREAS & POWER_RESETREAS_DOG_Msk) { + NRF_POWER->RESETREAS = POWER_RESETREAS_DOG_Msk; + uint32_t usb_reg = NRF_POWER->USBREGSTATUS; + + // If USB is connected, then the user might be editing `code.py`, + // in which case we should reboot into Safe Mode. + if (usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk) { + return WATCHDOG_RESET; + } + } + return NO_SAFE_MODE; } |