trylaarsdam / STM32L4xx-Watchdog

Simple hardware watchdog library for the STM32L4xx series and PlatformIO.

STM32L4xx Watchdog Library

Usage

Creating Watchdog Object

#include "WatchDog.hpp"

WatchDog watchdog;

Initializing the Watchdog

watchdog.init([seconds]);

[seconds] specifies the timeout period for the watchdog. If the watchdog is not "pet" within this amount of time (excluding when sleeping in Shutdown mode), the device will be reset and the IWDGRST RCC flag will be set.

Petting/Refreshing the Watchdog Countdown

watchdog.pet();

Checking if the Watchdog is Currently Enabled

watchdog.isEnabled();

This function returns a bool, where true means the watchdog is enabled and false designates the watchdog is not running. Note: this function only returns true when that watchdog instance has started the watchdog, and will not return true when another object has started the watchdog or the watchdog has been started manually.

Checking if the Watchdog caused a system reset

if(__HAL_RCC_GET_FLAG(RCC_FLAG_IWDGRST)) {
  //watchdog caused reset
}
else {
  //watchdog did not cause reset
}
__HAL_RCC_CLEAR_RESET_FLAGS(); // clears reset flags, otherwise on the next reset even though the watchdog may not have caused the reset `RCC_FLAG_IWDGRST` will still be set.