/*
 * CodedLockLED.c
 *
 * Created: 2020-01-13 12:30:17
 * Author : oem1
 */

#define F_CPU 16000000UL
#include <avr/io.h>
#include <util/delay.h>

#define LED_DIR DDRB				/* define LED_DIR which allows us to decide on the direction of data  */
#define KEYS_DIR DDRA				/* define KEYS_DIR which allows us to decide on the direction of data */
#define LED_SUPPLY DDRD				/* define LED_SUPPLY which allows us multiplex the 7 segment displays */
#define LED_PORT PORTB				/* define LED_PORT which sends the data about segments to light up    */
#define KEYS_PORT PORTA				/* define KEYS_PORT													  */
#define LIGHT_PORT PORTC			/* define KEYS_PORT													  */

int code[] = {9,9,9,9};				/* code that will open our lock										  */
int is_code_set = 0;
char array[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
//  0	1	 2	  3	    4	 5	  6   7	   8	9
/* hex values for 7 segment display from 0 to 9 */

int button1 = 0, button2 = 0, button3 = 0, button4 = 0;
int flag = 0;
int elapsedTime = 0;

int main(void)
{
	LED_DIR |= 0XFF;				/* LED port direction is output */
	KEYS_DIR = 0x00;				/* KEY port direction is input  */
	KEYS_PORT = 0XFF;
	LED_SUPPLY = 0xFF;
	LED_PORT = array[0];			/* displaying all zeros on the display */
	DDRC = 0xFF;
	LIGHT_PORT = 0xFF;

	while(1)
	{
		if(elapsedTime > 30) //we prevent the system from receiving too many inputs
			{
				elapsedTime = 0;
				flag = 0;
			}

		//MULTIPLEXING THE 7 SEGMENT DISPLAY
		DDRD = 0x80;							//DDRD = 0x80 only first on
		LED_PORT = array[button1];
		_delay_ms(4);
		DDRD = 0x40;							//DDRD = 0x40 only second on
		LED_PORT = array[button2];
		_delay_ms(4);
		DDRD = 0x20;							//DDRD = 0x20 only third on
		LED_PORT = array[button3];
		_delay_ms(4);
		DDRD = 0x10;							//DDRD = 0x10 only fourth on
		LED_PORT = array[button4];
		_delay_ms(4);


		if(bit_is_clear(PINA,7) && flag == 0)  //if button1 is pressed, adequate number on the display increases
		{
			button1++;
			flag = 1;
			if(button1>9) button1 = 0;
		}

		if(bit_is_clear(PINA,6) && flag == 0) //if button2 is pressed, adequate number on the display increases
		{
			button2++;
			flag = 1;
			if(button2>9) button2 = 0;
		}

		if(bit_is_clear(PINA,5) && flag == 0) //if button3 is pressed, adequate number on the display increases
		{
			button3++;
			flag = 1;
			if(button3>9) button3 = 0;
		}

		if(bit_is_clear(PINA,4) && flag == 0) //if button4 is pressed, adequate number on the display increases
		{
			button4++;
			flag = 1;
			if(button4>9) button4 = 0;
		}

		if(is_code_set == 0)
		{
			if(bit_is_clear(PINA,0))
			{
				code[0] = button1;
				code[1] = button2;
				code[2] = button3;
				code[3] = button4;
				is_code_set = 1;
			}
		}

		else
		{
			if(bit_is_clear(PINA,0) && button1 == code[0] && button2 == code[1] && button3 == code[2] && button4 == code[3] ) // if user presses the accept button and the code is correct
			{																												  // the lights will turn on for 3 seconds indicating open door
				LIGHT_PORT = 0x00;  //lights on
				DDRD = 0x00;		//turning off the display
				_delay_ms(3000);
				LIGHT_PORT = 0xFF;  //lights off
				button1 = button2 = button3 = button4 = 0; //resetting the values on screen
			}

			if(bit_is_clear(PINA,0) && (button1 != code[0] || button2 != code[1] || button3 != code[2] || button4 != code[3] )) //if user presses the accept button but the code is incorrect
			{																													// the lights will flash 3 times
				DDRD = 0x00;		   //turning off the display

				for(int a=0;a<3;a++)
				{
					_delay_ms(300);
					LIGHT_PORT = 0x00; //lights on
					_delay_ms(300);
					LIGHT_PORT = 0xFF; //lights off
				}

				button1 = button2 = button3 = button4 = 0; //resetting the values on screen
			}
		}

		elapsedTime++;
	}
}