4.c

MAX7219的驱动程序

#include "reg52.h"
#define Addr_No_Op    0x00   //不工作寄存器地址
#define Addr_Digit0   0x01
#define Addr_Digit1   0x02
#define Addr_Digit2   0x03
#define Addr_Digit3   0x04
#define Addr_Digit4   0x05
#define Addr_Digit5   0x06
#define Addr_Digit6   0x07
#define Addr_Digit7   0x08
#define Addr_Decode_Mode 0x09    //译码模式寄存器地址
#define Addr_Intensity    0x0a //亮度控制寄存器地址（max7221）
#define Addr_Scan_Limit   0x0b //扫描控制寄存器地址
#define Addr_Shutdowm     0x0c    //掉电模式寄存器地址
#define Addr_Display_Test  0x0f    //显示检测寄存器地址
#define uchar unsigned char
sbit Max7219_Din=P3^4;
sbit Max7219_Load=P3^5;
sbit Max7219_Clk=P3^6;

uchar code max7219_7led_code[18]={0x7e,0x30,0x6d,0x79,  //0-1-2-3
          0x33,0x5b,0x5f,0x70,  //4-5-6-7
          0x7f,0x7b,0x01,0x4e,  //8-9-"-"-E
          0x37,0x0e,0x67,0x00};  //H-L-P-空白    


void wr_max7219(uchar addr,uchar dat)
{
 uchar i;
 Max7219_Load=0;
 Max7219_Clk=0;
 for(i=0;i<8;i++)
 {
  Max7219_Din = (bit)(addr&0x80);
  addr=addr<<1;
  Max7219_Clk=1;
  Max7219_Clk=0;
 }
 for(i=0;i<8;i++)
 { 
  Max7219_Din=(bit)(dat&0x80);
  dat=dat<<1;
  Max7219_Clk=1;
  Max7219_Clk=0;
 }  
 Max7219_Load=1;
 Max7219_Load=0;
}
main()
{
   uchar j;
 for(j=200;j>0;j--);
   
 wr_max7219(Addr_Shutdowm,0x01);
 wr_max7219(Addr_Scan_Limit,0x07);
 wr_max7219(Addr_Intensity,0x0f);
 wr_max7219(Addr_Decode_Mode,0x0f);
 wr_max7219(Addr_Digit0,max7219_7led_code[1]);
 wr_max7219(Addr_Digit1,max7219_7led_code[2]);
 wr_max7219(Addr_Digit2,max7219_7led_code[3]);
 wr_max7219(Addr_Digit3,max7219_7led_code[4]);
 wr_max7219(Addr_Digit4,max7219_7led_code[5]);
 wr_max7219(Addr_Digit5,max7219_7led_code[6]);
 wr_max7219(Addr_Digit6,max7219_7led_code[7]);
    wr_max7219(Addr_Digit7,max7219_7led_code[8]);

    P0=0x00;
 //  wr_max7219(Addr_Display_Test,0x01);   //测试
   while(1);
}