Watchdog (#108)

* add SW reset

* adds watchdog

hid/lib/drivers-stm32/board-stm32.h

@@ -23,16 +23,23 @@
 #pragma once
 
 #include "board.h"
+#include <libmaple/iwdg.h>
 
 
 namespace DRIVERS {
 	class BoardStm32 : public Board {
 		public:
 			BoardStm32() : Board(BOARD){
+				//2 sec timeout
+				iwdg_init(IWDG_PRE_16, 0xFFF);
 			}
 
 			void reset() override {
 				nvic_sys_reset();
 			}
+
+			void periodic() {
+				iwdg_feed();
+			}
 	};
 }

hid/lib/drivers/board.h

@@ -29,5 +29,6 @@ namespace DRIVERS {
 	struct Board : public Driver {
 		using Driver::Driver;
 		virtual void reset() {}
+		virtual void periodic() {}
 	};
 }

hid/src/main.cpp

@@ -242,6 +242,7 @@ void loop() {
 
 	_out.kbd->periodic();
 	_out.mouse->periodic();
+	_board->periodic();
 
 #	ifdef CMD_SERIAL
 	static unsigned long last = micros();