RPi.I2C.Net

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Library for working with I2C bus on Raspberry Pi

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RPi.I2C.Net
===========

I2C library on C# for Raspberry Pi. About connecting Arduino and Raspberry Pi read this blog posts: [hardware part](http://blog.mshmelev.com/2013/06/connecting-raspberry-pi-and-arduino.html) and [software part](http://blog.mshmelev.com/2013/06/connecting-raspberry-pi-and-arduino-software.html).

## Description
The library provides basic read/write functionality with I2C-devices for Mono v. 2.10.x.
It uses device files exposed by the I2C kernel drivers in Arch Linux.

## Preparations
1. Update your system to get I2C kernel drivers. For Arch Linux:
```bash
$ pacman -Syu
```

2. Load I2C kernel module. You can do
```bash
$ modprobe i2c-dev
```
Or if you want to load the module automatically on boot add `i2c-dev` to `/etc/modules/`. If you're on Arch Linux create file `/etc/modules-load.d/i2c.conf` and add `i2c-dev` to the file.

## Library Usage
1. The RPi.I2C.Net library requires a native-C library [libnativei2c.so](https://github.com/mshmelev/RPi.I2C.Net/blob/master/Lib/LibNativeI2C/libnativei2c.so), which is a part of this project.
   * It's precompiled for Arch Linux. If you need to compile it, run `make` from `Lib/LibNativeI2C/src`.
   * Put `libnativei2c.so` to `/usr/lib/` or to the same folder where `RPi.I2C.Net.dll` is located.
2. Create `I2CBus` instance with `I2CBus.Open()`. The function accepts path to an I2C device file, which is `"/dev/i2c-0"` for RPi rev.1 and `"/dev/i2c-1"` for RPi rev.2 by default.
3. Use `I2CBus.WriteBytes()` or `I2CBus.ReadBytes()`.

```C#
using (var bus = RPi.I2C.Net.I2CBus.Open("/dev/i2c-1"))
{
	bus.WriteByte(42, 77);
}
```

## Performance
The performance testing was done using:
* Raspberry Pi, Rev.2, not overclocked
* Arduino Uno

####Writing
Sending 3-byte packets to Arduino.
Results: **1428 transactions per second** (4284 Bytes/s)

####Reading
Reading 3-byte packets from Arduino.
Results: **1660 transactions per second** (4980 Bytes/s)

####Reading and Writing
Sending 3-byte packet to Arduino and reading back the respose 3-byte packet.
Results: **830 transactions per second** (4980 Bytes/s total)

## License
The project uses [MIT license](https://github.com/mshmelev/RPi.I2C.Net/blob/master/license.txt): do whatever you want wherever you want it.

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