watchdog.c

基于温度传感器LM35与PIC16F877A的应用程序

#include <pic.h>
#define portbit(address,bits) ((unsigned)(&address) * 8 + (bits))

volatile bit red @ portbit(PORTD,7);
volatile bit green @ portbit(PORTD,6);

void delay(unsigned int data)
 {
     unsigned int i;
     unsigned char j;
     
     for (i = 0; i < data; i ++)
         {
           for (j = 0; j < 250; j ++)
               {
                  }
          }
   }

void system_init(void)
 {
  PORTD = 0x00;
  TRISD = 0x00;
  INTCON = 0x00;
  }

void wdt_init(void)
 {
  PSA = 1;
  OPTION |= 0x07;
   }

void clean_wdt(void)
 {
  CLRWDT();
  }

void main(void)
 {
  system_init();
  green = 1;
  red = 1;
  delay(1000);
  wdt_init();
  clean_wdt();
  green = 0;
  red = 0;
  while (1)
   {
     
     }
  }