Firmware/watchdog.cpp
2011-11-06 14:22:15 +01:00

49 lines
1.1 KiB
C++

#ifdef USE_WATCHDOG
#include <avr/wdt.h>
#include <avr/interrupt.h>
volatile uint8_t timeout_seconds=0;
void(* ctrlaltdelete) (void) = 0; //does not work on my atmega2560
//Watchdog timer interrupt, called if main program blocks >1sec
ISR(WDT_vect)
{
if(timeout_seconds++ >= WATCHDOG_TIMEOUT)
{
#ifdef RESET_MANUAL
LCD_MESSAGE("Please Reset!");
ECHOLN("echo_: Something is wrong, please turn off the printer.");
#else
LCD_MESSAGE("Timeout, resetting!");
#endif
//disable watchdog, it will survife reboot.
WDTCSR |= (1<<WDCE) | (1<<WDE);
WDTCSR = 0;
#ifdef RESET_MANUAL
kill(); //kill blocks
while(1); //wait for user or serial reset
#else
ctrlaltdelete();
#endif
}
}
/// intialise watch dog with a 1 sec interrupt time
void wd_init()
{
WDTCSR = (1<<WDCE )|(1<<WDE ); //allow changes
WDTCSR = (1<<WDIF)|(1<<WDIE)| (1<<WDCE )|(1<<WDE )| (1<<WDP2 )|(1<<WDP1)|(0<<WDP0);
}
/// reset watchdog. MUST be called every 1s after init or avr will reset.
void wd_reset()
{
wdt_reset();
timeout_seconds=0; //reset counter for resets
}
#endif /* USE_WATCHDOG */