[AVR] MAX7219로 알파벳 표시

MAX7219로 알파벳 표시

 

#include <avr/io.h>
#define F_CPU 16000000UL // 16 MHz
#include <util/delay.h>

#define U08 unsigned char

#define CS_1  PORTC|=4  // PC2=1
#define CS_0  PORTC&=~4 // PC2=0
#define DIN_1 PORTC|=2  // PC1=1
#define DIN_0 PORTC&=~2 // PC1=0
#define CLK_1 PORTC|=1  // PC0=1
#define CLK_0 PORTC&=~1 // PC0=0

U08 Alphabet[156]={
	0x7f,0x88,0x88,0x88,0x88,0x7f, // A
	0x6e,0x91,0x91,0x91,0x91,0xff, // B
	0x42,0x81,0x81,0x81,0x81,0x7E, // C
	0x7e,0x81,0x81,0x81,0x81,0xff, // D
	0x91,0x91,0x91,0x91,0xff,0x81, // E
	0x80,0x90,0x90,0x91,0xff,0x81, // F
	0x4e,0x89,0x89,0x81,0x81,0x7e, // G
	0xff,0x10,0x10,0x10,0x10,0xff, // H
	0x00,0x81,0xff,0xff,0x81,0x00, // I
	0x00,0x80,0xfe,0x81,0x01,0x06, // J
	0x81,0xc3,0x24,0x99,0xff,0x81, // K
	0x03,0x01,0x01,0x81,0xff,0x81, // L
	0xff,0x60,0x18,0x18,0x60,0xff, // M
	0xff,0x06,0x08,0x10,0x60,0xff, // N
	0x7e,0x81,0x81,0x81,0x81,0x7e, // O
	0x70,0x88,0x88,0x89,0xff,0x81, // P
	0x7e,0x87,0x89,0x85,0x81,0x7e, // Q
	0x61,0x93,0x94,0x98,0x98,0xff, // R
	0x4e,0x91,0x91,0x91,0x91,0x62, // S
	0xc0,0x81,0xff,0xff,0x81,0xc0, // T
	0xfe,0x01,0x01,0x01,0x01,0xfe, // U
	0xfc,0x02,0x01,0x01,0x02,0xfc, // V
	0xff,0x02,0x04,0x04,0x02,0xff, // W
	0xc3,0x24,0x18,0x18,0x24,0xc3, // X
	0xc0,0x20,0x1f,0x1f,0x20,0xc0, // Y
	0xc3,0xa1,0x91,0x89,0x85,0xc3  // Z
};

void SPI_Wr_Byte(U08 num){
	U08 t;
	CLK_0;
    
    for(t=0;t<8;t++){
    if(num&(0x80>>t))
    DIN_1;
    
    else
    DIN_0;
    CLK_1;
    CLK_0;}
}

void MAX7219_INIT(){
	CS_0; SPI_Wr_Byte(0x09); SPI_Wr_Byte(0x00); CS_1; // Set BCD decode mode // Decode Mode // BCD mode
	CS_0; SPI_Wr_Byte(0x0A); SPI_Wr_Byte(0x05); CS_1; // Set display brightness // Intensity register // Set brightness
	CS_0; SPI_Wr_Byte(0x0B); SPI_Wr_Byte(0x07); CS_1; // Set display refresh // Scan-Limit register // Select digits DIG0-DIG3
	CS_0; SPI_Wr_Byte(0x0C); SPI_Wr_Byte(0x01); CS_1; // Turn on the display
	CS_0; SPI_Wr_Byte(0x0F); SPI_Wr_Byte(0x00); CS_1; // Disable Display-Test // Display-Test register // Disable Display-Test
}

void Write_Byte(U08 myColumn,U08 myValue){
	CS_0; SPI_Wr_Byte(myColumn);
    SPI_Wr_Byte(myValue);
    CS_1;
}

void Clear_Matrix(void){ U08 x; for(x=1;x<9;x++)Write_Byte(x,0); }

void Write_Char(U08 myChar){
	U08 Column,Start_Byte;
	Clear_Matrix();
	Start_Byte=(myChar-'A')*6;
    
	for(Column=2;Column<8;Column++)Write_Byte(Column,Alphabet[Start_Byte++]);
}

int main(){
	U08 x;
	DDRC=0xFF;      // GP3 is input only
	MAX7219_INIT(); // initialize max7219
	
    while(1){
		for(x='A';x<='Z';x++){
        Write_Char(x);
        _delay_ms(1000);
        }
	}
}