diff options
Diffstat (limited to 'src/avr/watchdog.c')
-rw-r--r-- | src/avr/watchdog.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/avr/watchdog.c b/src/avr/watchdog.c new file mode 100644 index 000000000..f925a8d5e --- /dev/null +++ b/src/avr/watchdog.c @@ -0,0 +1,38 @@ +// Initialization of AVR watchdog timer. +// +// Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net> +// +// This file may be distributed under the terms of the GNU GPLv3 license. + +#include <avr/interrupt.h> // WDT_vect +#include <avr/wdt.h> // wdt_enable +#include "command.h" // shutdown +#include "sched.h" // DECL_TASK + +static uint8_t watchdog_shutdown; + +ISR(WDT_vect) +{ + watchdog_shutdown = 1; + shutdown("Watchdog timer!"); +} + +static void +watchdog_reset(void) +{ + wdt_reset(); + if (watchdog_shutdown) { + WDTCSR |= 1<<WDIE; + watchdog_shutdown = 0; + } +} +DECL_TASK(watchdog_reset); + +static void +watchdog_init(void) +{ + // 0.5s timeout, interrupt and system reset + wdt_enable(WDTO_500MS); + WDTCSR |= 1<<WDIE; +} +DECL_INIT(watchdog_init); |