init

watchdog.cpp

@@ -0,0 +1,56 @@
+#include "Marlin.h"
+
+#ifdef USE_WATCHDOG
+#include <avr/wdt.h>
+
+#include "watchdog.h"
+#include "ultralcd.h"
+
+//===========================================================================
+//=============================private variables  ============================
+//===========================================================================
+
+//===========================================================================
+//=============================functinos         ============================
+//===========================================================================
+
+
+/// intialise watch dog with a 4 sec interrupt time
+void watchdog_init()
+{
+#ifdef WATCHDOG_RESET_MANUAL
+    //We enable the watchdog timer, but only for the interrupt.
+    //Take care, as this requires the correct order of operation, with interrupts disabled. See the datasheet of any AVR chip for details.
+    wdt_reset();
+    _WD_CONTROL_REG = _BV(_WD_CHANGE_BIT) | _BV(WDE);
+    _WD_CONTROL_REG = _BV(WDIE) | WDTO_4S;
+#else
+    wdt_enable(WDTO_4S);
+#endif
+}
+
+/// reset watchdog. MUST be called every 1s after init or avr will reset.
+void watchdog_reset() 
+{
+    wdt_reset();
+}
+
+//===========================================================================
+//=============================ISR               ============================
+//===========================================================================
+
+//Watchdog timer interrupt, called if main program blocks >1sec and manual reset is enabled.
+#ifdef WATCHDOG_RESET_MANUAL
+ISR(WDT_vect)
+{ 
+    //TODO: This message gets overwritten by the kill() call
+    LCD_ALERTMESSAGEPGM("ERR:Please Reset");//16 characters so it fits on a 16x2 display
+    lcd_update();
+    SERIAL_ERROR_START;
+    SERIAL_ERRORLNPGM("Something is wrong, please turn off the printer.");
+    kill(); //kill blocks
+    while(1); //wait for user or serial reset
+}
+#endif//RESET_MANUAL
+
+#endif//USE_WATCHDOG