/*
  Filename: switchStates
  Author: George Howard
  Date: 20/02/2024
  Description: This is a program that displays a specific pattern of LED's based on switch inputs.
*/

#include <avr/io.h>
#include <util/delay.h>
#define mask1 = 0b10000011

int main(void) {
  unsigned char ledsOut = 0x00;
  unsigned char switches = 0x00;
  unsigned char masked = 0x00;

  DDRC = 0x00;			//Port C pins configured as input
  DDRA = 0xFF;			//Port A pins configured as output
  PORTC = 0xFF;		//Enabling the pull-up resistors

    while(1) {
        switches = PINC;             //read from the Port C switches
        masked = switches & 0b10000011;

        switch (masked) {
            case 0b00000001:
                ledsOut = 0xAA;
                break;
            case 0b00000010:
                ledsOut = 0x55;
                break;
            case 0b00000011:
                ledsOut = 0x00;
                break;
            case 0b10000000:
                ledsOut = switches;
                break;
            case 0b10000001:
                ledsOut = switches;
                break;
            case 0b10000010:
                ledsOut = switches;
                break;
            case 0b10000011:
                ledsOut = switches;
                break;
            default:
                ledsOut = 0x00;
                break;
        }
      
        PORTA = ledsOut;                  //display ledsOut to Port A 
    }
}




/*  Alternative solutiton not utilising masking and switch statements. I think it's a bit cleaner :)

    if ((switches & 0x80) == 0x00) {	
        if ((switches & 0x03) == 0x03) {
            ledsOut = 0x00;
        }
        else if ((switches & 0x02) == 0x02) {
            ledsOut = 0x55;
        } 
        else if ((switches & 0x01) == 0x01) {
            ledsOut = 0xAA;
        }
        else {
            ledsOut = 0x00;
        }
    } 
    else if ((switches & 0x80) == 0x80) {
        ledsOut = switches;
    } 
    else {
        ledsOut = 0x00;
    }

*/