max7219串行驱动led数码管1.c

基于Proteus的51系列单片机设计与仿真

/******************************************************************************
                               MAX7219串行驱动LED数码管
                                   移动显示0到9
******************************************************************************/
#include"reg51.h"
#include"intrins.h"
#define uchar unsigned char
#define uint unsigned int
sbit date=P2^0;
sbit load=P2^1;
sbit clk=P2^2;
uchar bdata bitmsb;
sbit m7 = bitmsb^7;
uchar code tab[]={ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
                   0x7e,0x30,0x6d,0x79,0x33,0x5b,0x5f,0x70,0x7f,0x7b,//0到9
				   0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
				  };//0到9
uchar x,y,c;
void send(void)    //送一个字节
{      
      uchar count;
       bitmsb=x;
	       for(count=0;count<8;count++)
		        {         if(m7)
		  	   			         {  clk=0;
								    date=1;
									_nop_();
									clk=1;
							     }
						   else	{  clk=0;
						           date=0;
								   _nop_();
							   	   clk=1;
								}
							bitmsb <<= 1;
				 	}
}
void wr(void)   
{     
         load=0;
         send();
		 x=y;
		 send();
         load=1;
}
void ready(void)
{
          x=0xfb;   //设置扫描限制
		  y=0x07;
		  wr();
		  x=0xf9;   //译码模式
		  y=0x00;
		  wr();
		  x=0xfa;   //亮度调节
		  y=0x0c;
		  wr();
		  x=0xfc;   //关断模式
		  y=0x01;
		  wr();     
}
void delay(uint i)
{
        for(;i>0;i--);
}
void main(void)
{          
      uchar i; 
      uchar  cout=0;
	     ready();  //初始化  
          c=1;
		  x=1;
	 while(1) 
	{
	for(i=cout;i<8+cout;i++)  
		    {   
		          y=tab[i];
                  x=c;
		          wr();
				  c++;//因为X的值已经破坏了  所以要用到C变量来赋值
		     }
                 delay(40000);//延时
				  c=1;       
                cout+=1;
			    if(cout==18)
				  cout=0;
   }	
}