/*
 * MAX7219.cpp
 *
 * Created: 10.03.2024 10:11:05
 * Author : Fadel
 */ 

#include <avr/io.h>
#define F_CPU 16000000UL
#include <util/delay.h>
#define dinpin 0
#define cspin  1
#define clkpin 2
#define max_port PORTB
#define max_dir  DDRB
void serial_write(unsigned char data)
{
 max_port &=~(1<<cspin);
 for(unsigned char i =0;i<9;i++)
 {
	max_port &=~(1<<clkpin);
	if(data & 0X80)
	max_port |=(1<<dinpin);
	else
	max_port &=~(1<<dinpin); 

	max_port |=(1<<clkpin);
	data <<=1;
 }
 max_port |=(1<<cspin);
}
void write_data(unsigned char addr,unsigned char data)
{
		max_port &=~(1<<cspin);
		serial_write(addr);
		serial_write(data);
		max_port |=(1<<cspin);
}
void max7219_init()
{
	max_dir |=(1<<dinpin);
	max_dir |=(1<<cspin);
	max_dir |=(1<<clkpin);
	write_data(0X09,0XFF); // decode enabled
	write_data(0X0A,0X0F); // max brightness
	write_data(0X0B,0X07); // all displays are enabeld
	write_data(0X0C,0X01); // shutdown off
	write_data(0X0F,0x00); // displaytest off	
}	
int main(void)
{
	max7219_init();	
    while (1) 
    {
		for(int i =0;i<10;i++)
		{
		 write_data(1,i);
		 write_data(2,i);
		 write_data(3,i);
		 write_data(4,i);
		 write_data(5,i);
		 write_data(6,i);
		 write_data(7,i);
		 write_data(8,i);
		 _delay_ms(1000);	
		}	
			
    }
}