This project was born from the idea of using C# for a PiBorg. I started with a couple of other libraries, but faltered because of a bug in one of them that didn't read a ThunderBorg board properly. This made me search for something else, where I found a seemingly abandoned project to create an I2C library. Props to the original author from whom I forked the original library. I also had some correspondence with the PiBorg group who is / has helping / helped me out on this.

Cheers!

This project requires the following NuGet package:

install-package mono.posix-4.5

(Original Readme.md from original author)

I2C library on C# for Raspberry Pi. About connecting Arduino and Raspberry Pi read this blog posts: hardware part and software part.

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.

1. Update your system to get I2C kernel drivers. For Arch Linux:

$ pacman -Syu

2. Load I2C kernel module. You can do

$ 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.

1. The RPi.I2C.Net library requires a native-C library 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().

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

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)

The project uses MIT license: do whatever you want wherever you want it.