//max7219 led drive program
//for 51 mcu
//designed by zhaoliang
//2005-6-12 13:52
＃i nclude

/*************************************************/
//common part
#define? HIGH???? 1
#define? LOW????? 0
#define? TRUE????? 1
#define? FALSE????? 0
#define? ZERO????? 0
#define? MSB?????? 0x80
#define? LSB?????? 0x01
//max7219 part
#define? DECODE_MODE?? 0x09
#define? INTENSITY???? 0x0A
#define? SCAN_LIMIT??? 0x0B
#define? SHUT_DOWN???? 0x0C
#define? DISPLAY_TEST? 0x0F

//pin defined
/*********************************************************/
//change this part at different board
sbit LOAD=P1^2; //MAX7219??? Load-Data Input:??? rising edge? pin 12
sbit DIN=P1^1; //MAX7219??? Serial-Data Input:?? rising edge? pin 1
sbit CLK=P1^0; //MAX7219?? Serial-Clock Input:? maximum 10MHz? pin 13

//function define
/***********************************************************/
void Write_Max7219_byte(unsigned char temp);//write max7219 a byte
void Write_Max7219(unsigned char address,unsigned char dat);//write max7219 command and data
void Init_Max7219(void);//Initize max7219

//test program display from 1~8
/************************************************************/
void main(void)
{
?unsigned char i;
?Init_Max7219();?
?while(TRUE)
?{?
? for(i=1;i<9;i++)
? {
?? Write_Max7219(i,i);
? }
?}
}
/*************************************************************/
void Write_Max7219_byte(unsigned char temp)
{
?unsigned char i;
?for (i=0;i<8;i++)????
? {
?? CLK=LOW;
???? DIN=(bit)(temp&MSB);?????
???? temp<<=1;?
???? CLK=HIGH;
?? }
}
/**********************************************************/
void Write_Max7219(unsigned char address,unsigned char dat)
{
?LOAD=LOW;
?? Write_Max7219_byte(address);
?? Write_Max7219_byte(dat);
? LOAD=HIGH;????????????????
}
/**********************************************************/
void Init_Max7219(void)?????
{
?Write_Max7219(SHUT_DOWN, 0x01);?? //Normal Operation XXXXXXX1 Shutdown Mode?? XXXXXXXX0
?Write_Max7219(DISPLAY_TEST, 0x00);?? //Normal Operation XXXXXXX0 Display Test Mode XXXXXXXX1
?Write_Max7219(DECODE_MODE, 0xff);?? //Decode Mode Select D7~D0 1 B decode 0 No decode
?Write_Max7219(SCAN_LIMIT, 0x07);?? //SCAN LIMIT 0~7 0xX0~0xX7
?Write_Max7219(INTENSITY, 0x04);?? //Set Intensity?? 0xX0~0xXf
}

max7219 C語言驅動程序，此經過調試。

#define?????????? byte? ?unsigned char
?//#define???N_NOP?_nop_();//_nop_();_nop_();
?///////////////////////////////////////////////////////
?//MAX7219
??////////////////////////////////////////////////////////////////////
?//管腳,變量和常數定義;DEFINE
?#define??Model_addr??0x09???// X9 H
?#define??Bright_addr??0x0a???// XA H
?#define??Limit_addr??0x0b???// XB H
?#define??Shutd_addr??0x0c???// XC H
?#define??Test_addr??0x0f???// Xf H

?#define??Set_Normal??0x00?//進入正常而非測試工作方式
?#define??Set_Halt??0x00?//進入停機工作方式?
?
?#define??Set_Model??0xff?//將BCD碼譯成B碼；
?#define??Set_Bright??0x04?//占空比為15/32；
?#define??Set_Limit??0x07?//8位顯示方式；
?#define??Set_Shutd??0x01?//進入正常而非停機工作方式?

?sbit??DIN? ? ?=P1^0;
?sbit??LOAD? ??=P1^1;
?sbit??CLK? ? ?=P1^2;
?bit??bdata???bonceinit7219;
?//////////////////////////////////////////////////////////////////////
?//函數聲明;PROPERTY
?void?Init_7219_begin(void);
?void?Init_7219(void);
?void?write_one_8279(byte addr,byte mydate);
?//////////////////////////////////////////////////////////////////////
?//函數定義;FOUNCTION
?
?void?Init_7219_begin(void)
?{//MAX7219顯示型號時的初始化；
??write_one_8279(Model_addr,0x00);? ?//將BCD碼譯成B碼?

??write_one_8279(Bright_addr,Set_Bright);?//占空比為15/32?

??write_one_8279(Limit_addr,Set_Limit);? ?//8位顯示方式；

??write_one_8279(Shutd_addr,Set_Shutd);? ?//進入正常工作方式
?}

?void?Init_7219(void)
?{//MAX7219正常工作時的初始化;
??write_one_8279(Shutd_addr,Set_Halt);?//進入停機工作方式
??
??write_one_8279(Model_addr,Set_Model);? ?//將BCD碼譯成B碼?

??write_one_8279(Bright_addr,Set_Bright);?//占空比為15/32?

??write_one_8279(Limit_addr,Set_Limit);? ?//8位顯示方式；

??write_one_8279(Shutd_addr,Set_Shutd);? ?//進入正常而非停機工作方式

??write_one_8279(Test_addr,Set_Normal);? ?//進入正常而非測試工作方式
?}
?
?void?write_one_8279(?byte addr,?//要寫入的位置;
????byte mydate)?//要寫入的數據;
?{//寫數據給MAX7219函數;display data
??register byte i;

??LOAD=0; ????//-\_
??for(i=0;i<8;i++)
??{
???_nop_();
???CLK=0;????//-\_
???if(addr & 0x80)
????DIN=1;
???else
????DIN=0;
???_nop_();
???CLK=1;????//_/-
???addr=addr<<1;
??}
??for(i=0;i<8;i++)
??{
???_nop_();
???CLK=0;????//-\_
???if(mydate & 0x80)
????DIN=1;
???else
????DIN=0;
???_nop_();
???CLK=1;????//_/-
???mydate=mydate<<1;
??}
??LOAD=1;?????//_/-?
?}