STM8S MAX7219 dot matrix module driver chip program

The following is the .h file:

#ifndef __MAX7219_H

#define __MAX7219_H

#include "stm8s_gpio.h"

#include "stm8s.h"

#include

#include

#include "tim1.h"

#define uchar unsigned char

#define uint  unsigned int

#define count 8

void Init_MAX7219(void);

void MAX7219_Init(void);

void Write_Max7219_byte(uchar Data);    

void Write_Max7219(u8 address1,u8 dat1,u8 address2,u8 dat2);

#define High 1

#define Low 0

#define Din(High_Low) if(High_Low == 0)GPIO_WriteLow(GPIOC, GPIO_PIN_4);

else GPIO_WriteHigh(GPIOC, GPIO_PIN_4);

#define Cs(High_Low) if(High_Low == 0)GPIO_WriteLow(GPIOC, GPIO_PIN_3);

else GPIO_WriteHigh(GPIOC, GPIO_PIN_3);

#define Clk(High_Low) if(High_Low == 0)GPIO_WriteLow(GPIOC, GPIO_PIN_2);

else GPIO_WriteHigh(GPIOC, GPIO_PIN_2);

#endif

The following is the .c file:

#include "main.h"

void Init_MAX7219(void)

{

GPIO_Init(GPIOC, GPIO_PIN_4, GPIO_MODE_OUT_PP_HIGH_FAST); //PC4 high-speed push-pull output high level control DIN

GPIO_Init(GPIOC, GPIO_PIN_3, GPIO_MODE_OUT_PP_HIGH_FAST); //PC3 high-speed push-pull output high level control CS

GPIO_Init(GPIOC, GPIO_PIN_2, GPIO_MODE_OUT_PP_HIGH_FAST); //PC2 high-speed push-pull output high level control CLK

}

//--------------------------------------------

//Function: Write bytes to MAX7219 (U3)

//Entry parameters: DATA 

//Export parameters: None

//illustrate:

void Write_Max7219_byte(uchar Data)         

{

    flying i;    

Cs(0);

   for(i=8;i>=1;i--)

{  

Clk(0);

if(Data&0x80)

{

From(1);

}

else

{

From(0);

}

Data=Data<<1;

Clk(1);

delay_us(10);

Clk(0);

}                                 

}

//-------------------------------------------

//Function: write data to MAX7219

//Entry parameters: address, dat

//Export parameters: None

//illustrate:

void Write_Max7219(u8 address1,u8 dat1,u8 address2,u8 dat2)

{ 

     Cs(0);

     Write_Max7219_byte(address1); //Write address, i.e. digital tube number

     Write_Max7219_byte(dat1); //Write data, i.e. the digital tube displays numbers 

     Write_Max7219_byte(address2); //Write address, i.e. digital tube number

     Write_Max7219_byte(dat2); //Write data, i.e. the digital tube displays numbers 

     nop();

     Cs(1);                         

}

void MAX7219_Init(void)

{

/*

  Write_Max7219(0x09, 0x00,0x09, 0x00); //Decoding method: BCD code

  Write_Max7219(0x0a, 0x03,0x0a, 0x03); //Brightness 

Write_Max7219(0x0b, 0x07,0x0b, 0x07); //Scan limit; 8 digital tubes display

  Write_Max7219(0x0c, 0x01,0x0c, 0x01); //Power-down mode: 0, normal mode: 1

  Write_Max7219(0x0f, 0x00,0x0f, 0x00); //Display test: 1; Test ends, normal display: 0

*/

u8 i;

Cs(0);

for(i=0;i {

 Write_Max7219_byte(0x09); //Decoding method: BCD code       

 Write_Max7219_byte(0x00);    

}

Cs(1);

nop();

Cs(0);

for(i=0;i {

 Write_Max7219_byte(0x0a); //Brightness    

 Write_Max7219_byte(0x03);    

}

Cs(1);

nop();

Cs(0);

for(i=0;i {

 Write_Max7219_byte(0x0b); // //Scan boundary; 8 digital tubes display  

 Write_Max7219_byte(0x07);    

}

Cs(1);

nop();

Cs(0);

for(i=0;i {

 Write_Max7219_byte(0x0c); // //Power-down mode: 0, normal mode: 1

 Write_Max7219_byte(0x01);    

}

Cs(1);

nop();

Cs(0);

for(i=0;i {

 Write_Max7219_byte(0x0f); //Display test: 1; Test ends, normal display: 0

 Write_Max7219_byte(0x00);    

}

Cs(1);

nop();

}