*程序名称:  MAX7219 C语言控制程序                          
*程序功能: 3线串行控制8位共阴数码管                                  
*3线定义:DIN 串行数据输入                                                  
*                 LOAD  数据锁存                                                          
*                 CLK   时钟输入                                                          
***************************************************/
#include
#include            
sbit pinDIN=P0^0;                        //串行数据输入端
sbit pinLOAD=P0^1;                        //数据锁存端
sbit pinCLK=P0^2;                        //时钟输入端
#define uchar unsigned char
uchar code LEDcode[]=
{0x7e,0x30,0x6d,0x79,0x33,0x5b,0x5f,0x70,0x7f,0x7b,0x00     /*0,1,2,3,4,5,6,7,8,9,全灭*/
/* 0x77,0x1f,0x4e,0x3d,0x4f,0x47,0x67,0x3e,0xff, */  };    /*A,B,C,D,E,F,P,U,全亮*/

/**************************************************
*         向MAX7219写入字节（8位）函数                      *
***************************************************/
void sendbyte (uchar dat)
{
        uchar i,temp;
        _nop_();
        for (i=0;i<8;i++)
   {
       temp=dat&0x80;
       dat=dat<<1;
       if(temp)
           pinDIN=1;
       else
           pinDIN=0;
       pinCLK=0;
       _nop_();
       pinCLK=1;         
   }
}
/**************************************************
*        向MAX7219写入地址和控制字（16位）                  *
***************************************************/
void sendword (uchar addr,uchar dat)
{
        pinLOAD=0;
        _nop_();
        sendbyte (addr);
        _nop_();
        sendbyte (dat);
        _nop_();
        pinLOAD=1; //第16个上升沿之后，第17个上升沿之前必须把pinCLK置高，否则数据丢失
}
/**************************************************
*                MAX7219初始化                                          *
***************************************************/
void init7219 (void)
   {
            sendword (0x0c,0x01);     /*  设置电源工作模式      */   
            sendword (0x0a,0x09);     /*   设置亮度  19/32      */  
            sendword (0x0b,0x03);     /*  设置扫描界限          */
            sendword (0x09,0x00);     /*   设置译码模式         */
                sendword (0x0f,0x00);     /*显示测试 00为正常工作状态*/
   }
/**************************************************
*                MAX7219清除显示                                  *
***************************************************/
void clear7219(void)
{
        uchar i;
        for(i=8;i>0;i--)
        {
                sendword(i,0x00);
        }
}
/**************************************************
*                MAX7219主函数                                          *
***************************************************/
/*void main(void)
{
   init7219 ();
   //clear7219();
   while(1)     
                {
                        clear7219();  
                        sendword(0x01,LEDcode[11]);  
                        sendword(0x02,LEDcode[12]|0x80);  
                        sendword(0x03,LEDcode[13]);  
                        sendword(0x04,LEDcode[4]);  
                        sendword(0x05,LEDcode[5]);  
                        sendword(0x06,LEDcode[6]);  
                        sendword(0x07,LEDcode[7]);  
                        sendword(0x08,LEDcode[8]); 

                }      
}*/