// INCLUDES
#include <xc.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>

// CONFIG
#pragma config FOSC = HS        // Oscillator Selection bits (HS oscillator: High-speed crystal/resonator on RA6/OSC2/CLKOUT and RA7/OSC1/CLKIN)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable bit (PWRT disabled)
#pragma config MCLRE = OFF      // RA5/MCLR/VPP Pin Function Select bit (RA5/MCLR/VPP pin function is digital input, MCLR internally tied to VDD)
#pragma config BOREN = OFF      // Brown-out Detect Enable bit (BOD disabled)
#pragma config LVP = OFF        // Low-Voltage Programming Enable bit (RB4/PGM pin has digital I/O function, HV on MCLR must be used for programming)
#pragma config CPD = OFF        // Data EE Memory Code Protection bit (Data memory code protection off)
#pragma config CP = OFF         // Flash Program Memory Code Protection bit (Code protection off)

// DEFINITIONS
#define _XTAL_FREQ 16000000     // refenrence freq for the compiler  
#define Rs PORTAbits.RA0        // Rs is connected to RA0
#define En PORTAbits.RA1        // En is connected to RA1

#define lcd_port PORTB          // lcd port b

// FUNCTION PROTOTYPE
int lcd_strobe(void);
void lcd_write(unsigned char dat);
void lcd_cmd(unsigned char cmd);
void lcd_data(unsigned char dat);
void lcd_init(void);
void lcd_writestr(const unsigned char *c);
void lcd_setcursor(unsigned char loc);
void lcd_line1(void);
void lcd_line2(void);

// function to pulse the En pin high
int lcd_strobe(void)
{
    En = 1;
    __delay_us(1);
    En = 0;
}

// function to write to the lcd port
void lcd_write(unsigned char dat)
{
    lcd_port &= 0x0f;           // get current port and clear upper bits
    lcd_port |= (dat & 0xf0);   // combine upper and lower, leave lower 
    lcd_strobe();
    
    lcd_port &= 0x0f;
    lcd_port |= ((dat << 4) & (0xf0));  // combine upper and lower
    lcd_strobe();
    __delay_ms(2);                      // little delay for lcd to process
}

// function to set lcd in command mode
void lcd_cmd(unsigned char cmd)
{
    Rs = 0;             // rs low for cmd mode
    lcd_write(cmd);
}

// functionto set lcd in data mode
void lcd_data (unsigned char dat)
{
    Rs = 1;             // rs high for data mode
    lcd_write(dat);
}

// function to initialize the lcd
void lcd_init(void)
{
    lcd_cmd(0x28);      
    __delay_ms(50);
    
    lcd_cmd(0x28);  // 4-bit, 2-line, 5x7 font
    lcd_cmd(0x0e);  // display on, cursor on, blink off
    lcd_cmd(0x06);  // auto increment, no shift
    lcd_cmd(0x80);  // address ddram with 0 offset 80h
}

// function to write a strng to the lcd
void lcd_writestr(const unsigned char *c)
{
    while (*c != '\0')
    {
        lcd_data(*c);
        c++;
    }
}

// function to place the cursor on the lcd
void lcd_setcursor(unsigned char loc)
{
    lcd_cmd(loc | 0x80);
}

// function to move cursor to 1st place on line 1
void lcd_line1(void)
{
    lcd_setcursor(0);
}

// function to move cursor to 1st place on line 2
void lcd_line2(void)
{
    lcd_setcursor(40);
}

void main(void) 
{
    CMCON = 0x07;
    TRISA = 0b00000000;
    TRISB = 0b00000110; 
    PORTA = 0b00000000;
    PORTB = 0b00000000;
    
    lcd_strobe();    
    lcd_init();    
    
    lcd_writestr("  HackerBoxes   ");
    lcd_line2();
    lcd_writestr("   HackLife     ");
    
    while (1);

}