EX_WDT.C
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/////////////////////////////////////////////////////////////////////////
//// EX_WDT.C ////
//// ////
//// This program demonstartes the watchdog timer. If the user ////
//// does not hit a key in the set amount of time, the processor ////
//// restarts, and tells the user why it restarted. ////
//// ////
//// Configure the CCS prototype card as described below. ////
//// ////
//// This example will work with the PCB and PCM compilers. ////
//// The following conditional compilation lines are used to ////
//// include a valid device for each compiler. Change the device, ////
//// clock and RS232 pins for your hardware if needed. ////
/////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2001 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS ////
//// C compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, ////
//// reproduction or distribution is permitted without written ////
//// permission. Derivative programs created using this software ////
//// in object code form are not restricted in any way. ////
/////////////////////////////////////////////////////////////////////////
#if defined(__PCB__)
#include <16c56.h>
#fuses HS,WDT,NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2) // Jumpers: 11 to 17, 12 to 18
#elif defined(__PCM__)
#include <16f877.h>
#fuses HS,WDT,NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9200, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
#endif
main() {
switch ( restart_cause() )
{
case WDT_TIMEOUT:
{
printf("\r\nRestarted processor because of watchdog timeout!\r\n");
break;
}
case NORMAL_POWER_UP:
{
printf("\r\nNormal power up!\r\n");
break;
}
}
setup_wdt(WDT_2304MS);
while(TRUE)
{
restart_wdt();
printf("Hit any key to avoid a watchdog timeout.\r\n");
getc();
}
}
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