/* Name: main.c
 * Author: Stephen Hansen
 */

#include <avr/io.h>
#include <util/delay.h>

#define RED 0
#define GREEN 1
#define BLUE 2

unsigned char data[8][8][3] = {
{{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}},
{{255,128,0}, {255,128,0}, {255,128,0}, {255,128,0}, {255,128,0}, {255,128,0}, {255,128,0}, {255,128,0}},
{{0,0,0}, {0,0,0}, {0,0,0}, {255,255,0}, {255,255,0}, {0,0,0}, {0,0,0}, {0,0,0}},
{{0,0,0}, {0,0,0}, {0,0,0}, {128,255,0}, {128,255,0}, {0,0,0}, {0,0,0}, {0,0,0}},
{{0,0,0}, {0,0,0}, {0,0,0}, {0,255,0}, {0,255,0}, {0,0,0}, {0,0,0}, {0,0,0}},
{{0,0,0}, {0,0,0}, {0,0,0}, {0,255,128}, {0,255,128}, {0,0,0}, {0,0,0}, {0,0,0}},
{{0,0,0}, {0,0,0}, {0,0,0}, {0,255,255}, {0,255,255}, {0,0,0}, {0,0,0}, {0,0,0}},
{{0,0,0}, {0,0,0}, {0,0,0}, {0,128,255}, {0,128,255}, {0,0,0}, {0,0,0}, {0,0,0}}};

void select_row_column_test(const unsigned char r, const unsigned char c, const unsigned char color);
void delay(const unsigned char intensity, const unsigned char total);
void delay_time(const unsigned char length);

int main(void)
{
	DDRA = 0xFF;
	DDRB = 0xFF;
	DDRC = 0xFF;
	DDRD = 0xFF;
	
	PORTA = 0x00;	//row select (all off)
	PORTB = 0x00;	//red
	PORTC = 0x00;	//green
	PORTD = 0x00;	//blue
	
	char r, c, color = 0;
    /* insert your hardware initialization here */
    for(;;){
	for(r = 0; r <= 7; r++){
		for(c = 0; c <= 7; c++){
			for(color = 0; color <= 2; color++){
				select_row_column_test(r,c,color);
			}
		}
    }
	}
    return 0;   /* never reached */
}

//r is 0-7 for row 0-7, c is 0-7 for column 0-7, color is 0-2 for red, green, blue respectively
void select_row_column_test(const unsigned char r, const unsigned char c, const unsigned char color){
	PORTA = (1 << (7-r));
	if(color > 0){
		switch(color){
			case RED:
				PORTB = (1 << (7-c));
				break;
			case GREEN:
				PORTC = (1 << (7-c));
				break;
			case BLUE:
				PORTD = (1 << (7-c));
				break;
		}
	}
	unsigned char intensity = data[(short)r][(short)c][(short)color];
	delay(intensity,255);
}

void delay(const unsigned char intensity, const unsigned char total){
	//clock frequency = 8 MHz, min frequency for 60 Hz = 3 MHz, trying software approach first, timers will come later with interrupts.
//	unsigned int i;
	//leaving LED on for as long as was specified
	delay_time(intensity);
	PORTA = 0x00; //turn off all row power (done with this intensity level)
	//turning off all columns as well
	PORTB = 0x00;
	PORTC = 0x00;
	PORTD = 0x00;
	//waiting a while before running to next LED
	delay_time(total-intensity);
}

void delay_time(const unsigned char length){
	unsigned int i;
	unsigned int max = (unsigned int)(length);
	max <<= 5;;
	for(i=0;i<max;i++){
	}
}