数码管.c

单片机开发板演示程序 3个I/O控制8位数码管数码管显示 晶体：12M MCU：STC89S51

#include<at89x51.h>
#include<intrins.h>
#define unchar unsigned char
code unchar TAB[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90}; //共阳数码管段
unchar m,sz[8];
unsigned int i,a=0,b,c,d=0,th,h,tc,c,ts,s;
sbit  SDATA_595 = P2^0 ;       /*串行数据输入*/  
sbit  SCLK_595  = P2^1;       /*移位时钟脉冲*/
sbit  RCK_595   = P2^2;      /*输出锁存器控制脉冲*/
static void  WR_595(unsigned char data num2 )
 {
   unsigned char data count1;
   
   for(count1=0;count1<=7;count1++)
   {
     if((num2&0x80)==0x80)  /*最高位为1，则向SDATA_595发送1*/
	    SDATA_595=1;        /*发出数据的最高位*/
	 else  
	    SDATA_595=0;
	 
	 num2<<=1;         /*右移位*/
	 SCLK_595=0;	   /*产生上生沿*/
	 SCLK_595=1;
    
	}  

 }
/*-------------------------------------------------------------------------------
                     打开锁存，更新74595输出子程序
---------------------------------------------------------------------------------*/
static void Out_595(void)
 {
   RCK_595=0;
   _nop_();
   _nop_();
   RCK_595=1;  /*上升沿锁存数据*/

 }
 void disp(void)
{ 
WR_595(TAB[1]);//送段数据
WR_595(0x01);//位选通
 Out_595();	 //锁存信号
WR_595(TAB[2]);
WR_595(0x02);
 Out_595();
WR_595(TAB[3]);
WR_595(0x04);
 Out_595();
WR_595(TAB[4]);
WR_595(0x08);
 Out_595();
WR_595(TAB[5]);
WR_595(0x10);
 Out_595();
WR_595(TAB[6]);
WR_595(0x20);
 Out_595();
WR_595(TAB[7]);
WR_595(0x40);
 Out_595();
WR_595(TAB[8]);
WR_595(0x80);
 Out_595();
WR_595(0xff);
WR_595(0xff);
 Out_595();}
/*-----------------------------------------------------------------
						主函数
---------------------------------------------------------------*/
main()
{
	while(1)
		{   
		 disp();		 //显示子函数
		 calculate();//处理数据函数		   
		}
}