Working with i2c switch under Linux

Hello everyone!

I have Ubuntu Linux launched on my MiniITX board and I'd like to write/read to i2c-eeprom.
In board User Guide it is said that jumper JP12 switches i2c-master. But there are no markers defining which position is current: 1-2 or 2-3. So I tried both and nothing changes in
# i2cdetect -l
output. It always says:
i2c-0 i2c XILINX I2C at e0004000 I2C adapter
So as I understand, i2c master doesn't change. Is that o'k?

Also, I don't understand how to write to EEPROM through the i2c switch. I cannot find i2c addresses for the devices in documentation. As I understand, that EEPROM is empty and is not used by the system so there is no problem using it.

Thank you in advance.

0 Former Member over 11 years ago

Hi,
JP12 allows you to select the mux control from either PS (1-2) or PL (2-3). I don't have the latest production board so I'm not sure if the silkscreen has changed, but a little trick I learned is figure out which pin is #1 is to flip the board over and take a look at the solder mask underneath. There will be one pin where the solder is in a square, and that indicates pin #1. Not sure if that is universal, but it's true for all the Avnet boards.
If you download the embedded design for the Mini-ITX from the Reference Design section, you will find an SDK project in the hierarchy. For an example of using the EEPROM, take a look at the zynq_mini_itx_i2c_test project under that workspace.
Ron
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0 Former Member over 11 years ago in reply to Former Member

very much!
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