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42 pfowler 1 
#include <avr/io.h>
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#include "wire.h"
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#include "lcd.h"
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#define F_CPU 12000000
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#include <util/delay.h>
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void lcd_init() {
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	lcd_sendNib(0x30);
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	_delay_ms(4500);
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	lcd_sendNib(0x30);
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	_delay_ms(4500);
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	lcd_sendNib(0x30);
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	_delay_ms(150);
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	lcd_sendNib(0x20);
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	lcd_command(LCD_FUNCTIONSET | LCD_4BITMODE | LCD_2LINE | LCD_5x8DOTS);
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	lcd_command(LCD_DISPLAYCONTROL | LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF);
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	lcd_command(LCD_CLEARDISPLAY);
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	_delay_ms(2000);
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	lcd_command(LCD_RETURNHOME);
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}
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void lcd_command(uint8_t data) {
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	lcd_send(data, LCD_MODE_CM);
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}
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void lcd_char(uint8_t data) {
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	lcd_send(data, LCD_MODE_RS);
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}
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void lcd_send(uint8_t value, uint8_t mode) {
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	uint8_t high = value & 0xf0;
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	uint8_t low = (value << 4) & 0xf0;
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	lcd_sendNib((high)|mode);
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	lcd_sendNib((low)|mode);
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}
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void lcd_sendNib(uint8_t nib) {
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	lcd_write(nib);
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	lcd_pulse(nib);
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}
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void lcd_write(uint8_t data) {
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	i2c_beginTransmission(LCD_ADDR);
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	i2c_writeByte((int) data | 0x08);
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	i2c_endTransmission(1);
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}
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void lcd_pulse(uint8_t data) {
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	lcd_write(data | LCD_MODE_EN);
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	_delay_ms(1);
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	lcd_write(data & ~LCD_MODE_EN);
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	_delay_ms(50);
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}