//Watchdog timer Demo

//#include <16F628.h>
#include <16F648A.h>
#use delay(clock=4000000)
#fuses XT,PUT,BROWNOUT,MCLR,WDT,NOPROTECT,NOLVP
#define  TxD         PIN_A0
#define  RxD         PIN_A1
#use rs232(baud=9600, xmit=TxD,rcv=RxD)

void main(void)
{
int c,done;
   
   switch(restart_cause())
   {
    case WDT_FROM_SLEEP:
        printf("WAKEUP form sleep\r\n");
        break;

    case WDT_TIMEOUT:
        printf("Watchdog Reset!\r\n");
        break;
    case NORMAL_POWER_UP:
        printf("Normal  power up!\r\n");
        break;
    
    default:
     printf("Reset!\r\n");  //27
   }
   printf("*** Watchdog Timer  ***\r\n");
   printf("Press h goto Halt\r\n");
   printf("Press s goto Sleep mode\r\n");
   setup_wdt(WDT_2304MS);

   done=0;
   while(!done)
   {
    if(kbhit())
    {
     c =getc();
     //printf("%c",c);
     switch(c)
     {
      case 's':
           done=1;
           break;
      case 'h':
            printf("Halt!\r\n");
            while(1);
           break;
     }
    }

    restart_wdt();      //Clear Watch Dog
   }

   printf("sleep\r\n");
}