/**************************************************************************

THE MAX7221 LED DRIVER LIB

COPYRIGHT (c) 2005 BY JJJ.
-- ALL RIGHTS RESERVED --

File Name: Max7221.h
Author: Jiang Jian Jun
Created: 2005/9/19
Modified:NO
Revision: 1.0

***************************************************************************/
#ifndef _MAX7221_LED_DRIVER_2005_9_19_
#define _MAX7221_LED_DRIVER_2005_9_19_

#include

sbit Max7221CS = P3^1;
sbit Max7221DIN = P3^0;
sbit Max7221CLK = P3^2;

void WriteMax7221(unsigned char Address,unsigned char Data)
{
unsigned char i;
Max7221CS = 0;
for (i=0;i<8;i++)
{
Max7221CLK = 0;
Max7221DIN = (Address&(0x80>>i)) ? 1:0;
_nop_();
_nop_();
Max7221CLK = 1;
_nop_();
_nop_();
}
for (i=0;i<8;i++)
{
Max7221CLK = 0;
Max7221DIN = (Data&(0x80>>i)) ? 1:0;
_nop_();
_nop_();
Max7221CLK = 1;
_nop_();
_nop_();
}
Max7221CS = 1;
}

void InitialMax7221(void)
{
WriteMax7221(0x0A,0x07);//亮度地址0AH,0x00~0x0F,0x0F最亮
WriteMax7221(0x0B,0x07);//掃描LED個(gè)數(shù)地址0BH,0x00~0x07,最多掃描8個(gè)數(shù)碼管
WriteMax7221(0x0C,0x01);//工作模式地址0x0C. 0x00:ShutDown;0x01:Normal
WriteMax7221(0x09,0xFF);//編碼模式地址0x09. 0x00~0xFF:哪一位為1，哪一位就支持編碼
}

void Max7221Display(unsigned char *buffer)
{
unsigned char i;
for(i=0;i<8;i++)
{
WriteMax7221(i+1,*(buffer+i));
}
}

#endif

#include
#include "Max7221.h"

unsigned char DisplayBuffer[8]={0,1,2,3,4,5,6,7};//顯示緩沖區(qū)

main()
{
InitialMax7221();
Max7221Display(&DisplayBuffer[0]);
while(1);
}
仿真電路