74hc595.h

4X4矩阵键盘的驱动

#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit dat=P1^0;    //定义驱动74595的数据脚为p1.0
sbit clk=P1^1;    //74595的时钟
sbit lat=P1^2;    //栓锁
uchar code tab[]=
{ 0x3F,0x06,0x5B,0x4F,    //"0","1","2","3"
  0x66,0x6D,0x7D,0x07,    //"4","5","6","7"
  0x7F,0x6F,0x77,0x7c,    //"8","9","A","B" 
  0x39,0x5e,0x79,0x71,0x00    //"C","D","E","F"
} ;

dsout(uchar j)
{
	uchar i; 
	for(i=0;i<8;i++)
    {
		dat=j&0x80;       //高位在前
		clk=1;
		clk=0;													
		j<<=1;
    }
  lat=1;
  lat=0;               //锁存
}