/***********************************************************************/
//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
}