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Control an ATmega328P via I2C

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## avr-io

Firmware for the ATmega328P which allows it to function as an I2C device and
have it's pins controlled via I2C. When running the firmware, the ATmega can
be accessed at it's default address of 0x28 on an I2C-bus.

When the ATmega328P is clocked at 8MHz, the firmware will function on an
I2C-bus running at speeds of up to 100KHz without stretching the I2C clock.

### Usage

Blink an LED:

```
var i2c = require('i2c-bus').openSync(1);

var OUTPUT = 1;

var AVR_ADDR = 0x28,
  P8_MODE = 0x20,
  P8_VALUE = 0x21;

i2c.writeByteSync(AVR_ADDR, P8_MODE, OUTPUT);

setInterval(function () {
  i2c.writeByteSync(AVR_ADDR, P8_VALUE,
    i2c.readByteSync(AVR_ADDR, P8_VALUE) ^ 1);
}, 500);
```

### Pin Function Descriptions

### Register Map

Address | Name | Reset Value | Arduino Pin | ATmega328P Pin | Description
---: | :--- | ---: | :--- | :--- | :---
0x00 | P0_MODE | INPUT | 0 | 2 | Mode pin 0
0x01 | P0_VALUE | 0 or 1 | 0 | 2 | Value pin 0
0x04 | P1_MODE | INPUT | 1 | 3 | Mode pin 1
0x05 | P1_VALUE | 0 or 1 | 1 | 3 | Value pin 1
0x08 | P2_MODE | INPUT | 2 | 4 | Mode pin 2
0x09 | P2_VALUE | 0 or 1 | 2 | 4 | Value pin 2
0x0c | P3_MODE | INPUT | 3 | 5 | Mode pin 3
0x0d | P3_VALUE | 0 or 1 | 3 | 5 | Value pin 3
0x10 | P4_MODE | INPUT | 4 | 6 | Mode pin 4
0x11 | P4_VALUE | 0 or 1 | 4 | 6 | Value pin 4
0x14 | P5_MODE | INPUT | 5 | 11 | Mode pin 5
0x15 | P5_VALUE | 0 or 1 | 5 | 11 | Value pin 5
0x18 | P6_MODE | INPUT | 6 | 12 | Mode pin 6
0x19 | P6_VALUE | 0 or 1 | 6 | 12 | Value pin 6
0x1c | P7_MODE | INPUT | 7 | 13 | Mode pin 7
0x1d | P7_VALUE | 0 or 1 | 7 | 13 | Value pin 7
0x20 | P8_MODE | INPUT | 8 | 14 | Mode pin 8
0x21 | P8_VALUE | 0 or 1 | 8 | 14 | Value pin 8
0x24 | P9_MODE | INPUT | 9 | 15 | Mode pin 9
0x25 | P9_VALUE | 0 or 1 | 9 | 15 | Value pin 9
0x28 | P10_MODE | INPUT | 10 | 16 | Mode pin 10
0x29 | P10_VALUE | 0 or 1 | 10 | 16 | Value pin 10
0x2c | P11_MODE | INPUT | 11 | 17 | Mode pin 11
0x2d | P11_VALUE | 0 or 1 | 11 | 17 | Value pin 11
0x30 | P12_MODE | INPUT | 12 | 18 | Mode pin 12
0x31 | P12_VALUE | 0 or 1 | 12 | 18 | Value pin 12
0x34 | P13_MODE | INPUT | 13 | 19 | Mode pin 13
0x35 | P13_VALUE | 0 or 1 | 13 | 19 | Value pin 13
0x38 | P14_MODE | INPUT | A0 | 23 | Mode pin A0
0x39 | P14_VALUE (LSB) | 0 or 1 | A0 | 23 | Value pin A0 (LSB)
0x3a | P14_VALUE (MSB) | 0 | A0 | 23 | Value pin A0 (MSB)
0x3c | P15_MODE | INPUT | A1 | 24 | Mode pin A1
0x3d | P15_VALUE (LSB) | 0 or 1 | A1 | 24 | Value pin A1 (LSB)
0x3e | P15_VALUE (MSB) | 0 | A1 | 24 | Value pin A1 (MSB)
0x40 | P16_MODE | INPUT | A2 | 25 | Mode pin A2
0x41 | P16_VALUE (LSB) | 0 or 1 | A2 | 25 | Value pin A2 (LSB)
0x42 | P16_VALUE (MSB) | 0 | A2 | 25 | Value pin A2 (MSB)
0x44 | P17_MODE | INPUT | A3 | 26 | Mode pin A3
0x45 | P17_VALUE (LSB) | 0 or 1 | A3 | 26 | Value pin A3 (LSB)
0x46 | P17_VALUE (MSB) | 0 | A3 | 26 | Value pin A3 (MSB)

### Modes

### Supported Modes

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