#include <avr/io.h>

void wait(int i)
{
	volatile int j,k;
	for(j=0;j<i;j++){
		for(k=0;k<55;k++);
	}
}


void LED_MAT(unsigned char SELECT, unsigned char DATA)
{
		volatile int i;
		PORTC = PORTC | 0b00000001;						// Load ON
		wait(2);
		PORTC = PORTC & 0b11111110;						// Load OFF
		for(i=0;i<8;i++){								// Send Register data
			PORTC = PORTC & 0b11111101;					// CLK OFF
			if(((SELECT << i) & 0b10000000)==0){
				PORTC = PORTC & 0b11111011;
			}
			else{
				PORTC = PORTC | 0b00000100;
			}
			wait(1);
			PORTC = PORTC | 0b00000010;					// CLK ON
			wait(1);
		}
		for(i=0;i<8;i++){								// Send LED DATA
			PORTC = PORTC & 0b11111101;					// CLK OFF
			if(((DATA << i) & 0b10000000)==0){
				PORTC = PORTC & 0b11111011;
			}
			else{
				PORTC = PORTC | 0b00000100;
			}
			wait(1);
			PORTC = PORTC | 0b00000010;					// CLK ON
			wait(1);
		}

		PORTC = PORTC | 0b00000001;
		PORTC = PORTC & 0b11111001;
}

void LED_init(void){

	LED_MAT(0b00001100,0b00000001);				//Shutdown  mode : Normal Operation
	LED_MAT(0b00001001,0b00000000);				//Decode    mode : No decode
	LED_MAT(0b00001010,0b00001111);				//Intensity mode : max
	LED_MAT(0b00001011,0b00000111);				//Scan Limit	 : 01234567
	
	LED_MAT(0b00000001,0b00000000);				//line1
	LED_MAT(0b00000010,0b00000000);				//line2
	LED_MAT(0b00000011,0b00000000);				//line3
	LED_MAT(0b00000100,0b00000000);				//line4
	LED_MAT(0b00000101,0b00000000);				//line5
	LED_MAT(0b00000110,0b00000000);				//line6
	LED_MAT(0b00000111,0b00000000);				//line7
	LED_MAT(0b00001000,0b00000000);				//line8

}


int main(void)
{

	DDRC =   0b11111111;
	PORTC =  0b00000000;

	LED_init();

	while(1){
		
		LED_MAT(1,0b00000001);
		LED_MAT(2,0b00000011);
		LED_MAT(3,0b00000111);
		LED_MAT(4,0b00001111);
		LED_MAT(5,0b00011111);
		LED_MAT(6,0b00111111);
		LED_MAT(7,0b01111111);
		LED_MAT(8,0b11111111);
	}


}