PIC16F676使用74HC5951驱动8位数码管时钟

Pang8343569 · 发表于 2016-7-2 14:34

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//基于pic16f676宝贵的IO，本程序使用2片74HC595
//驱动8位数码管的小时钟。可做成实物，特附PROTEUS仿真图。
//小弟初学，水平有限，大家多多指点，不吝赐教。
//QQ交流：271344691
#include<pic.h>//PIC16F676-SOP14
#define uint unsigned int
#define uchar unsigned char
#define SH_CP RC0//595端口
#define DS RC1
#define ST_CP RC2
#define key0 RC3//按键端口
#define key1 RC4
#define key2 RC5
#define _XTAL_FREQ 16000000UL//16MHZ时钟，指令周期0.25微秒
const uchar table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf};//0-9共阳数码管代码
uchar sec=0;
uchar min=0,hour=0;
uchar count=0;
__CONFIG(0X0002);//外接16MHZ晶振
void delayms(uint z) //1ms延时函数
  {
  uint x,y;
  for(x=z;x>0;x--)
for(y=100;y>0;y--);
}
void delayus(uint z)
{
  uint x,y;
  for(x=z;x>0;x--)
for(y=10;y>0;y--);
}
void serial_input_595(uint dat)
{
  for(uchar i=0;i<8;i++)
{
   if(dat&0x80) DS=1;else DS=0;
   dat<<=1;
   SH_CP=0;delayus(3);
   SH_CP=1;delayus(3);
   SH_CP=0;delayus(3);
}
}
void parallel_output_595()
{
  ST_CP=0;delayus(2);
  ST_CP=1;delayus(2);
  ST_CP=0;delayus(2);
}
void distime()//显示时间
{
   serial_input_595(0x01);
   serial_input_595(table[hour/10]);
   parallel_output_595();
   delayms(1);
   serial_input_595(0x02);
   serial_input_595(table[hour%10]);
   parallel_output_595();
   delayms(1);
   serial_input_595(0x04);
   serial_input_595(table[10]);
   parallel_output_595();
   delayms(1);
   serial_input_595(0x08);
   serial_input_595(table[min/10]);
   parallel_output_595();
   delayms(1);
   serial_input_595(0x10);
   serial_input_595(table[min%10]);
   parallel_output_595();
   delayms(1);
   serial_input_595(0x20);
   serial_input_595(table[10]);
   parallel_output_595();
   delayms(1);
   serial_input_595(0x40);
   serial_input_595(table[sec/10]);
   parallel_output_595();
   delayms(1);
   serial_input_595(0x80);
   serial_input_595(table[sec%10]);
   parallel_output_595();
   delayms(1);
}
void keyscan()//简单按键处理，实现调时。
{
  if(key0==0)
   {
   delayms(10);
      if(key0==0)
         {
            sec++;
            if(sec==60)
               sec=0;
            distime();

         }
   while(key0==0);
   }

  if(key1==0)
   {
   delayms(10);
      if(key1==0)
         {
            min++;
            if(min==60)
               min=0;
            distime();
         }
      while(key1==0);
   }
if(key2==0)
   {
      delayms(10);
         if(key2==0)
            {
            hour++;
            if(hour==24)
                  hour=0;
            distime();
            }
      while(key2==0);
   }
}
void main()
{
  TRISC0=TRISC1=TRISC2=0X00;//595端口设置成写
  TRISC3=TRISC4=TRISC5=0XFF;//按键端口设置为读
  PORTC=0XFF;
  ANSEL=0X00;
  T1CKPS1=T1CKPS0=1;//16位定时器1设置为8分频，//总计时为65536*8*0.25=131ms
  TMR1H=(uint)(65536-_XTAL_FREQ/4*8*0.01)>>8;//定时10ms,注意不能超过总计时时间
  TMR1L=(uint)(65536-_XTAL_FREQ/4*8*0.01)&0XFF;
  //TMR1H=(65536-5000)/256;也可采用这种方法装初值，跟51单片机一样
  // TMR1L=(65536-5000)%256;5000*8*0.25=10ms，效果一样。
  TMR1CS=0;
  TMR1IF=0;
  TMR1IE=1;
  TMR1ON=1;
  GIE=1;
  PEIE=1;
  while(1)
   {
   distime();
   keyscan();
   }
}
void interrupt TMR_CONTROLL()
{
if(TMR1IF==1)
  {
//TMR0=6;
count++;
if(count==100)//16M crystal
   {
      count=0;
      sec++;
      if(sec==60)
         {
            sec=0;
            min++;
            if(min==60)
               {
                  min=0;
                  hour++;
                  if(hour==24)
                     {
                        hour=0;

                     }
               }
         }

   }
      //TMR1H=(65536-5000)/256;
   // TMR1L=(65536-5000)%256;
      TMR1H=(uint)(65536-_XTAL_FREQ/4/8*0.01)>>8;
      TMR1L=(uint)(65536-_XTAL_FREQ/4/8*0.01)&0XFF;
      TMR1IF=0;
  }
}