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nrf: boot into safe mode sometimes for watchdog reset

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If the watchdog resets the system and we're plugged into USB, boot into
safe mode.

Signed-off-by: Sean Cross <sean@xobs.io>
This commit is contained in:
Sean Cross 2020-05-22 12:56:49 +08:00
parent 8c5df5f732
commit e738f5eaa1
1 changed files with 15 additions and 0 deletions
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15
ports/nrf/supervisor/port.c
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@ -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;
}