Description:
I am encountering an issue while testing the watchdog functionality. When I intentionally hang the system for longer than the configured watchdog timeout period, the system restarts. However, the reset cause is reported as RESET_PIN rather than RESET_WATCHDOG as expected.
Watchdog Initialization Code:
int hal_watchdog_init(void)
{
bool found = false;
if (watchdog_device != NULL) {
LOG_INF("watchdog HAL already initialized");
return 0;
}
LOG_INF("initialize watchdog HAL");
watchdog_device = DEVICE_DT_GET(WATCHDOG0_NODE);
if (watchdog_device) {
if (device_is_ready(watchdog_device)) {
LOG_INF("found watchdog device \"%s\"", watchdog_device->name);
found = true;
struct wdt_timeout_cfg wdt_config = {
/* reset SoC when watchdog timer expires. */
.flags = WDT_FLAG_RESET_SOC,
/* expire watchdog after max window */
.window.min = WDT_MIN_WINDOW,
.window.max = WDT_MAX_WINDOW,
};
wdt_channel_id = wdt_install_timeout(watchdog_device, &wdt_config);
if (wdt_channel_id < 0) {
LOG_ERR("failed to install watchdog");
return -1;
}
} else {
LOG_ERR("watchdog device \"%s\" is not ready", watchdog_device->name);
}
}
if (found == false) {
LOG_ERR("no watchdog device found");
}
return (found ? 0 : (-1));
}Reset Cause Checking Code:
/* dump reset cause */
hwinfo_get_reset_cause(&reset_cause);
if (reset_cause == RESET_LOW_POWER_WAKE) {
LOG_INF("reset cause: wakeup");
} else if (reset_cause == RESET_POR) {
LOG_INF("reset cause: power");
} else if (reset_cause == RESET_WATCHDOG) {
LOG_INF("reset cause: watchdog");
#ifdef WATCHDOG_TEST
isWatchdogTestRun = false; // Disable the Watchdog Test after detecting a Watchdog-induced reset
#endif
} else if (reset_cause == RESET_PIN) {
LOG_INF("reset cause: reset pin");
} else if (reset_cause == RESET_SOFTWARE) {
LOG_INF("reset cause: software");
} else if (reset_cause == RESET_WATCHDOG) {
LOG_INF("reset cause: software reset");
} else {
LOG_INF("reset cause 0x%x", reset_cause);
}
Expected Behavior:
When the watchdog timeout is exceeded, the system should restart with the reset cause RESET_WATCHDOG.
Observed Behavior:
Instead, the system restart is being reported as due to RESET_PIN.
Best regards,
Ben Ron Udi
