shizhong.c

采用PIC单片机写的时钟小作品

#include<pic.h>

#define uchar unsigned char 
#define uint  unsigned int

uchar second,minute,hour;
uchar i,counter;

const uchar led_digit[11] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,
                             0x82,0xf8,0x80,0x90,0xbf};
const uchar led_bit[8] = {0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};
                          //0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f
uchar volatile table[8] = {0,0,10,0,0,10,0,0};

void TMR0_INIT()
{
  OPTION = 0X03;//1:16分频
  TMR0 = 0X06;
  T0IE = 1;
  T0IF = 0;  
}

void IO_INIT()
{
  TRISC = 0X00;
  TRISD = 0X00;
  TRISE = 0X07;
  PORTC = 0X00;
  PORTD = 0X00;
}

void KEYSCAN()
{
  if(RE0 == 0 )
    {
      second++;
      if(second == 60)
        second = 0;
      while(RE0 == 0);
    }
  if(RE1 == 0)
    {
      minute++;
      if(minute == 60)
        minute = 0;
      while(RE1 == 0);
    }
  if(RE2 == 0)
    {
      hour++;
      if(hour == 24)
         hour = 0;
      while(RE2 == 0);
     }
}


main()
{
  GIE = 1;
  TMR0_INIT();
  IO_INIT();
  while(1)
   {
   // if(RE0==1&&RE1==1&&RE2==1)
    //  { 
       if(counter == 250)
        { 
        second++;
        counter = 0;
         }
       if(second == 60)
         {
          second = 0;
          minute++;
         }
       if(minute == 60)
         {
          minute = 0;
          hour++;
         }
       if(hour == 24)
         {
          hour =0;
         }
    //  }
  //  else
      KEYSCAN();

 table[7] = hour/10;
 table[6] = hour%10;
 table[4] = minute/10;
 table[3] = minute%10;
 table[1] = second/10;
 table[0] = second%10;


    }
}

void interrupt tmr0()
{
// if(T0IF == 1)
//{
 T0IF = 0;
 TMR0 = 0X06;
 counter++;


 PORTC = led_digit[table[i]];
 PORTD = led_bit[i];

 i++;
 if(i == 7)
   i = 0;
// }
}