supervisor: add a new WATCHDOG_RESET safe mode reason

This mode will be used if the board is reset due to the watchdog
expiring.

Signed-off-by: Sean Cross <sean@xobs.io>

supervisor/shared/safe_mode.c

@@ -160,6 +160,9 @@ void print_safe_mode_message(safe_mode_t reason) {
             case MEM_MANAGE:
                 serial_write_compressed(translate("Invalid memory access."));
                 break;
+            case WATCHDOG_RESET:
+                serial_write_compressed(translate("Watchdog timer expired."));
+                break;
             default:
                 serial_write_compressed(translate("Unknown reason."));
                 break;

supervisor/shared/safe_mode.h

@@ -41,6 +41,7 @@ typedef enum {
   NORDIC_SOFT_DEVICE_ASSERT,
   FLASH_WRITE_FAIL,
   MEM_MANAGE,
+  WATCHDOG_RESET,
 } safe_mode_t;
 
 safe_mode_t wait_for_safe_mode_reset(void);