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123 pfowler 1 
#include <avr/io.h>
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#include <stdlib.h>
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#include "wire.h"
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#include "avrutil.h"
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#include <util/delay.h>
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#include "mio.h"
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#define IODIR	0x00	// I/O Direction, 1 = Input, 0 = Output
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#define IPOL	0x01	// Polarity, 1 = Invert
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#define	GPINTEN	0x02	// Interrupt on change, 1 = Enable
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#define	DEFVAL	0x03	// Default compare value
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#define INTCON	0x04
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#define	IOCON	0x05	// Config
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#define	GPPU	0x06	// Pullups for input, 1 = Enable
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#define	INTF	0x07	// Interrupt flag (pin mask)
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#define	INTCAP	0x08	// GPIO value at interrupt (RO)
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#define	GPIO	0x09	// Read value of pins
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#define OLAT	0x0a	// Latch pins (write)
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void mio_init() {
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  mio_init_addr(0x20);
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}
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void mio_init_addr(uint8_t i2c_addr) {
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  mio.i2c_addr = i2c_addr;
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  i2c_beginTransmission(mio.i2c_addr);
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  i2c_writeByte(IODIR);		// Start at 0x00
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  i2c_writeByte(0xFF);		// Set IODIR to all inputs
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  i2c_writeByte(0x00);		// Everything else default 0x00
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  i2c_writeByte(0x00);
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  i2c_writeByte(0x00);
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  i2c_writeByte(0x00);
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  i2c_writeByte(0x00);
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  i2c_writeByte(0x00);
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  i2c_writeByte(0x00);
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  i2c_writeByte(0x00);
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  i2c_writeByte(0x00);
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  i2c_endTransmission(1);
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}
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inline uint8_t mio_readPin(uint8_t pin) {
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    return rbi(mio_read(), pin);
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}
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inline uint8_t mio_read() {
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  return mio_readReg(GPIO);
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}
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inline void mio_latch(uint8_t data) {
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  mio_writeReg(OLAT, data);
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}
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void mio_latchPin(uint8_t pin, uint8_t value) {
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  uint8_t val = mio_read();
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  if (value)
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    sbi(val, pin);
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  else
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    cbi(val, pin);
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  mio_latch(val);
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}
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inline void mio_iodir(uint8_t dir) {
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  mio_writeReg(IODIR, dir);
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}
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inline void mio_pullups(uint8_t pu) {
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  mio_writeReg(GPPU, pu);
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}
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uint8_t mio_readReg(uint8_t address) {
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  if (!mio.i2c_addr) return 0xFF;
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  uint8_t reg = 0xFF;
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  i2c_beginTransmission(mio.i2c_addr);
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  i2c_writeByte((int) address);
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  i2c_endTransmission(0);
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  i2c_requestFrom(mio.i2c_addr, 1, 1);
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  if (i2c_available()) reg = i2c_read();
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  return reg;
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}
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void mio_writeReg(uint8_t address, uint8_t reg) {
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    if (!mio.i2c_addr) return;
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    i2c_beginTransmission(mio.i2c_addr);
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    i2c_writeByte((int) address);
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    i2c_writeByte(reg);
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    i2c_endTransmission(1);
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}
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