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51单片机做的Max7221驱动数码管仿真原理图如下：
仿真工程文件及所有完整程序等资料下载地址：
http://www.51hei.com/bbs/dpj-56304-1.html
单片机源程序：
- /**************************************************************************
-
- 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 <intrins.h>
- 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); //扫描LED个数地址0BH,0x00~0x07,最多扫描8个数码管
- WriteMax7221(0x0C,0x01); //工作模式地址0x0C. 0x00:ShutDown;0x01:Normal
- WriteMax7221(0x09,0xFF); //编码模式地址0x09. 0x00~0xFF:哪一位为1，哪一位就支持编码
- }
- void Max7221Display(unsigned char *buffer)
- {
- unsigned char i;
- for(i=0;i<8;i++)
- {
- WriteMax7221(i+1,*(buffer+i));
- }
- }
- #endif
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