fw: Add watchdog

Will reset after 1 second spent in app mainloop.

firmware/app.c

@@ -1,6 +1,7 @@
 #include "lib/system.h"
 #include "lib/hal.h"
 #include <stdlib.h>
+#include <util/delay.h>
 
 #define TIMER_INMENU TIMER_APP0
 #define TIMER_AUX TIMER_APP1
@@ -98,12 +99,34 @@ void system_test()
 		display_update();
 }
 
+// Note: This is only for watchdog testing.
+// Never use _delay_ms(...) in your programs. Use timer_* functions instead.
+void wdt_test()
+{
+	int i = 50;
+	display_clear(0);
+	while (i--) {
+		led[0].b = !led[0].b;
+		display_update();
+		_delay_ms(100);
+	}
+	led[0].b = 0;
+	led[0].r = 1;
+	display_update();
+	_delay_ms(2000);
+}
+
 void app_init()
 {
 	return;
 }
 
-#define APP_COUNT 3
+void app_suspend()
+{
+	return;
+}
+
+#define APP_COUNT 4
 enum app_return app_mainloop()
 {
 	static int app_sel = 0;
@@ -136,6 +159,9 @@ enum app_return app_mainloop()
 			case 2:
 				system_test();
 				break;
+			case 3:
+				wdt_test();
+				break;
 			default:
 				app_sel = 0;
 				break;

firmware/lib/system.c

@@ -1,4 +1,5 @@
 #include <avr/io.h>
+#include <avr/wdt.h>
 #include <util/delay.h>
 #include <string.h>
 #include <stdlib.h>
@@ -7,6 +8,7 @@
 #include "pm.h"
 
 extern void app_init();
+extern void app_suspend();
 extern enum app_return app_mainloop();
 
 struct cRGB led[STRIPLEN];
@@ -39,6 +41,7 @@ void boot_animation(enum BOOT_COLOR color_offset)
 	_delay_ms(10);
 	display_clear();
 	for(int i = 0; i<STRIPLEN; ++i) {
+		wdt_reset();
 		*(&led[i].r + color_offset) = 0x10;
 		display_update();
 		_delay_ms(15);
@@ -52,27 +55,30 @@ void system_boot()
 {
 	system_init();
 	pm_led_on_auto();
+	wdt_enable(WDTO_1S);
 	boot_animation(GREEN);
 	app_init();
 }
 
+void system_suspend()
+{
+	app_suspend();
+	boot_animation(RED);
+	wdt_disable();
+	pm_suspend();
+}
+
 int main()
 {
 	enum app_return ar;
 
-	system_boot();
-
 	while (1) {
-		while (1) {
-			ar = app_mainloop();
-			if (ar != RUN)
-				break;
-			// TODO: Handle reset instead of suspend
-			// TODO: wdt reset
-		}
-		boot_animation(RED);
-		pm_suspend();
 		system_boot();
+		while ((ar = app_mainloop()) == RUN) {
+			wdt_reset();
+		}
+		// TODO: Handle reset instead of suspend
+		system_suspend();
 	}
 
 	pm_reset();