Firmware2/Marlin/watchdog.pde

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#ifdef USE_WATCHDOG
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#include "watchdog.h"
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#include <avr/wdt.h>
#include <avr/interrupt.h>
//===========================================================================
//=============================private variables ============================
//===========================================================================
static volatile uint8_t timeout_seconds=0;
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void(* ctrlaltdelete) (void) = 0; //does not work on my atmega2560
//===========================================================================
//=============================functinos ============================
//===========================================================================
/// 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
}
//===========================================================================
//=============================ISR ============================
//===========================================================================
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//Watchdog timer interrupt, called if main program blocks >1sec
ISR(WDT_vect)
{
if(timeout_seconds++ >= WATCHDOG_TIMEOUT)
{
#ifdef RESET_MANUAL
LCD_MESSAGEPGM("Please Reset!");
SERIAL_ERROR_START;
SERIAL_ERRORLNPGM("Something is wrong, please turn off the printer.");
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#else
LCD_MESSAGEPGM("Timeout, resetting!");
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#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
}
}
#endif /* USE_WATCHDOG */