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/////////////////////////////////
// LCD Module Interface //
// for your average 2 line LCD //
// By Tim K //
/////////////////////////////////

#include <avr/io.h> // include input and output functions
#include <util/delay.h> // include functions for accurate delays
#include <stdio.h>
#include "lcd.h"

void lcd_set_controls_4bit(controlvar) { // wait for LCD to be ready
  char NIB1;
  char NIB2;
  NIB1 = ((controlvar&0b11110000)>>4); // set the first nibble
  NIB2 = (controlvar&0b00001111); // set the second nibble
  RW0; // enable writing mode
  RS0; // enable control register
  LCD_PORT = (LCD_PORT&LCD_CONTROLS)|((NIB1<<2)&LCD_DATAMASK); // set the first nibble bits
  E1; // write data to LCD
  _delay_us(1); // delay for signal
  E0; // stop data write
  _delay_ms(2); // delay for signal
  LCD_PORT = (LCD_PORT&LCD_CONTROLS)|((NIB2<<2)&LCD_DATAMASK); // set the second nibble bits
  E1; // write data to LCD
  _delay_us(1); // delay for signal
  E0; // stop data write
  _delay_ms(2); // delay for signal
  RS1; // select the data register (disables control register)
}

void lcd_set_controls_8bit(char controlvar) { // wait for LCD to be ready
  RW0; // enable writing mode
  RS0; // enable control register
  LCD_PORT = (LCD_PORT&LCD_CONTROLS)|((controlvar<<2)&LCD_DATAMASK); // set the bits
  E1; // write data to LCD
  _delay_us(1); // delay for signal
  E0; // stop data write
  _delay_ms(2); // delay for signal
  RS1; // select the data register (disables control register)
}

void lcd_set_home(void) {
    lcd_set_controls_4bit(0b00000001); // Go to home position. Return the DDRAM input to home
}

void lcd_clear_display(void) {
    lcd_set_controls_8bit(0b00000011); // Init
    lcd_set_controls_8bit(0b00000011); // Init
    lcd_set_controls_8bit(0b00000011); // Init
    lcd_set_controls_8bit(0b00000010); // Enable 4bit mode
    lcd_set_controls_4bit(0b00101000); // Enable 4bit mode, all 4 lines, default character.
    lcd_set_controls_4bit(0b00001100); // Enable the display. Disable the cursor. Do not blink cursor.
    lcd_set_controls_4bit(0b00000001); // Go to home position.
    lcd_set_controls_4bit(0b00000110); // Increment and do not shift display.
}

void lcd_set_line(x) {
  switch (x) {
    case 0:
            lcd_set_controls_4bit((1<<7)|0x00); // sets the position of the DDRAM input
            break;
    case 1:
            lcd_set_controls_4bit((1<<7)|0x40); // sets the position of the DDRAM input
            break;
    case 2:
            lcd_set_controls_4bit((1<<7)|0x14); // sets the position of the DDRAM input
            break;
    case 3:
            lcd_set_controls_4bit((1<<7)|0x54); // sets the position of the DDRAM input
            break;
  }
}

void lcd_write(writeval) {
    char NIB1;
    char NIB2;
    NIB1 = (writeval&0b11110000) >> 4;
    NIB2 = (writeval&0b00001111);
    LCD_PORT = (LCD_PORT&LCD_CONTROLS)|((NIB1<<2)&LCD_DATAMASK); // set the bits
    E1; // write data to LCD
    _delay_us(1); // delay for signal
    E0; // stop writing data
    _delay_ms(3);
    LCD_PORT = (LCD_PORT&LCD_CONTROLS)|((NIB2<<2)&LCD_DATAMASK); // set the bits
    E1; // write data to LCD
    _delay_us(1); // delay for signal
    E0; // stop writing data
    _delay_ms(3);
}

void lcd_write_line(int line, char *s) {
  lcd_set_line(line);
  char t;
  for(t = 0; t<20; t++) { // reads 20 characters from the passed string
  if(*s) { // if there is a character
  lcd_write(*s); // write it to the LCD
  s++; // and go to the next character
  } else {
  lcd_write(0x20);
  }
  }
}

void lcd_clear(void) {
lcd_write_line(0, "");
lcd_write_line(1, "");
lcd_write_line(2, "");
lcd_write_line(3, "");
}

void lcd_cnc_init(void) {
    DDRA = 0xFF;
    lcd_clear_display(); // clear and initialise the LCD
    lcd_set_home(); // sets the lcd home
    lcd_write_line(0, "HackMelbourne CNC"); // writes this string to the LCD
    lcd_write_line(1, "GRBL loaded!"); // writes this string to the LCD
    lcd_write_line(2, " Open serial term"); // writes this string to the LCD
    lcd_write_line(3, " and type '$'."); // writes this string to the LCD
}
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