/*
 * Author: Jake Goodwin
 * Date: 2022
 * Description: Interfacing with a 1602LCD only with the uc no perifs  
 */

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


#define RS_PORT PORTD
#define RS_PIN  PIND0
#define RS_DDR  DDD0


#define RW_PORT PORTD
#define RW_PIN  PIND1
#define RW_DDR  DDD1


#define ENA_PORT PORTD
#define ENA_PIN  PIND2
#define ENA_DDR  DDD2

#define BIT4_PORT   PORTD
#define BIT4_PIN    PIND3
#define BIT4_DDR    DDD3


#define BIT5_PORT   PORTD
#define BIT5_PIN    PIND4
#define BIT5_DDR    DDD4

#define BIT6_PORT   PORTD
#define BIT6_PIN    PIND5
#define BIT6_DDR    DDD5

#define BIT7_PORT   PORTD
#define BIT7_PIN    PIND6
#define BIT7_DDR    DDD6

#define LED_PIN     PINC0
#define LED_PORT    PORTC
#define LED_DDR     DDC0

//LCD CONNECTIONS
//PIND0 RS, H: data input L: Instruction input
//PIND1 RW, H: read L: write
//PIND2 ENABLE, Enable signal
//PIND3 BIT4
//PIND4 BIT5
//PIND5 BIT6
//PIND6 BIT7

//#############################
//FUNCTIONS
//#############################

void init_lcd(void) {
    DDRD |= (1<<RS_DDR)|(1<<RW_DDR)|(1<<ENA_DDR)|
        (1<<BIT4_PIN)|(1<<BIT5_PIN)|(1<<BIT6_PIN)|(1<<BIT7_PIN);

    _delay_ms(40);

    PORTD = (0<<RS_PIN)|(0<<RW_PIN)|(0<<ENA_PIN)|
        (1<<BIT4_PIN)|(1<<BIT5_PIN)|(0<<BIT6_PIN)|(1<<BIT7_PIN);

    _delay_ms_(5);

    PORTD = (0<<RS_PIN)|(0<<RW_PIN)|(0<<ENA_PIN)|
        (1<<BIT4_PIN)|(1<<BIT5_PIN)|(0<<BIT6_PIN)|(1<<BIT7_PIN);

    _delay_ms(1);


}

void cmd_lcd() {
;
}


/*
 * Input: None
 * Output: None
 * Description: Toggles the pin for the LED indicator.
 */
static void led_blink(void) {
    //Set the DDR for output.
    DDRC |= (1<<LED_PIN);

    PORTC ^= (1<<LED_PIN);
    _delay_ms(250);
    PORTC ^= (1<<LED_PIN);
    _delay_ms(250);
    
}

int main() {
    //SETUP HERE.
    init_lcd(); 

    while(1) {
        led_blink();
        test_lcd();
        _delay_ms(1000);
        off_lcd();
    }
    
    return 0;
}