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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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#include "macros.h"
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#include <util/delay.h>
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struct {
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	uint8_t display;
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	uint8_t function;
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	uint8_t backlight;
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} lcd;
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void lcd_init() {
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	lcd.backlight = LCD_BACKLIGHT;
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	lcd.display = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
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	lcd.function = LCD_2LINE;
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	lcd_pulse(0x30);
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	_delay_ms(50);
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	lcd_pulse(0x30);
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	_delay_ms(50);
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	lcd_pulse(0x30);
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	_delay_ms(50);
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	lcd_pulse(0x20);
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	_delay_ms(10);
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	lcd_command(LCD_FUNCTIONSET | lcd.function);
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	_delay_ms(10);
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	lcd_command(LCD_DISPLAYCONTROL | lcd.display);
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	_delay_ms(10);
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	lcd_clear();
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	_delay_ms(10);
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	lcd_home();
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	_delay_ms(10);
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}
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/** Helper functions **/
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inline void lcd_clear() {
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	lcd_command(LCD_CLEARDISPLAY);
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}
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inline void lcd_home() {
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	lcd_command(LCD_RETURNHOME);
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}
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inline void lcd_backlight() {
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	lcd.backlight = LCD_BACKLIGHT;
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}
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inline void lcd_noBacklight() {
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	lcd.backlight = LCD_NOBACKLIGHT;
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}
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void lcd_display() {
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	lcd.display |= LCD_DISPLAYON;
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	lcd_command(LCD_DISPLAYCONTROL | lcd.display);
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}
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void lcd_noDisplay() {
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	lcd.display &= ~LCD_DISPLAYON;
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	lcd_command(LCD_DISPLAYCONTROL | lcd.display);
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}
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void lcd_autoscroll() {
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        lcd.display |= LCD_ENTRYSHIFTINCREMENT;
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        lcd_command(LCD_ENTRYMODESET | lcd.display);
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}
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void lcd_setCursor(uint8_t col, uint8_t row) {
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	uint8_t row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
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	lcd_command(LCD_SETDDRAMADDR | ((col - 1)+ row_offsets[row]));
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}
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void lcd_overprint(char * str, uint8_t len, uint8_t col, uint8_t row) {
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	uint8_t i = 0;
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	for (i=0; i<=len; i++)
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		lcd_char(0x20);
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	lcd_setCursor(row, col);
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	uint8_t size = lcd_print(str);
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	for (i=size; i<=len; i++)
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		lcd_char(0x20);
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}
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/** End helpers **/
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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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uint8_t lcd_print(char* str) {
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	uint8_t c = 0;
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	while (str[0] != 0x00) {
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		lcd_char((uint8_t) str[0]);
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		str++;
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		c++;
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	}
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	return c;
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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_pulse((high)|mode);
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	lcd_pulse((low)|mode);
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}
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void lcd_pulse(uint8_t data) {
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	i2c_beginTransmission(LCD_ADDR);
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	i2c_writeByte((int) data | LCD_MODE_EN | lcd.backlight);
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	i2c_writeByte((int) data | lcd.backlight);
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	i2c_endTransmission(1);
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	_delay_us(5);
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}
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void lcd_createChar(uint8_t location, uint8_t charmap[]) {
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        location &= 0x7; // we only have 8 locations 0-7
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        lcd_command(LCD_SETCGRAMADDR | (location << 3));
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	uint8_t i = 0;
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        for (i=0; i<8; i++) {
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                lcd_char(charmap[i]);
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        }
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}