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