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I²C stands for Inter-Integrated circuit, and is a data transferation system that allows connections between computers or microcontrollers and low-level peripherals (e.g. sensors or EEPROMS). It is a multi-master, multi-slave, single-ended, serial computer bus.
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i2c problem. Working on one board not the other
On the board where i2c is working it shows lsmod | grep i2c
i2c_bcm2708 4834 0
i2c_dev 5859 0
and from dmesg | grep i2c
[ 3.188212] i2c /dev entries driver
[ 4.698330 … ] bcm2708_i2c 3f804000.i2c: BSC1 Controller at 0x3f804000 (irq 83) (baudrate 100000)
On the board where i2c is not working it shows lsmod | grep i2c
i2c_bcm2835 7167 0
i2c_bcm2708 …
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i2c problem. Working on one board not the other
Now I made it work partly, thanks to this page:
https://github.com/raspberrypi/firmware/issues/828
It seams the reason it worked on one RPi board and not the other was that one was updated with the l …
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I2C library for Mono/C#
I use this one. I did a lot of testing, works well. MIT license.
https://github.com/thomas3d/RPiCSIO
I have tested several other before, which had some problems.