Improve handling of arming, providing LED blink codes if the arming fails.

Also, implement a software watchdog to make sure that the main real-time
modules are actually being run. Provide a panic facility, also giving blink
codes to indicate the panic reason.

main.c

@@ -6,8 +6,9 @@
 #include "uart.h"
 #include "interrupt.h"
 #include "event.h"
-#include "stick.h"
 #include "led.h"
+#include "status.h"
+#include "watchdog.h"
 
 #define PINSEL0 (*((volatile unsigned int *) 0xE002C000))
 #define PINSEL1 (*((volatile unsigned int *) 0xE002C004))
@@ -179,13 +180,12 @@ void timer_event_handler(void)
 void menu_handler(void);
 
 int main(void) {
-	armed = FALSE;
-
 	init_interrupt();
 	init_uart();
 	init_i2c();
 	init_pins();
 	init_timer();
+	init_status();
 
 	event_register(EVENT_UART_INPUT, menu_handler);
 
@@ -197,11 +197,7 @@ int main(void) {
 
 	putstr("prompt> ");
 
-	led_set(FALSE);
 	timer_delay_ms(1000);
-	led_set(TRUE);
-	timer_delay_ms(1000);
-	led_set(FALSE);
 	if (!wmp_init())
 		putstr("WMP initialisation failed\r\n");
 
@@ -209,12 +205,15 @@ int main(void) {
 	timer_set_period(5*TIMER_MS);
 	wmp_start_zero();
 
-	led_set_pattern(led_pattern_active);
+	led_init();
+
+	init_watchdog();
 
 	/* Good luck! */
 	while (1) {
 		led_update();
 		event_dispatch();
+		watchdog_check();
 	}
 
 	return 0;