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I2C bus on FMC connector under Linux

Former Member

Hello everyone

I have a problem concerning the I2C bus on the Zynq MINI-ITX board.

I bought a FMC male connector to use the I2C bus (SDA pin: C30 and SCL pin : C31).

I tried both PS and PL master configuration and nothing changes in #i2cdetect -l output. It always says:
i2c-0 i2c CADENCE I2C at e0004000 I2C adapter

When I try an #i2cdetect -r 0 nothing appear, not even the I2C switch (adress range: 0x70 to 0x77).

I have a device which have D0 as I2C adress, connected to C30 and C31 pins but #i2cget return nothing at 0xD0 adress.

Thank you in advance

  • 0

    Hi,

    There are a couple of 2014.4 reference designs that you might be able to use to compare to your own design.  The hardware platform for the Standalone HDMI design is the same platform used for the Ubuntu Desktop.  If you load the Ubuntu Desktop on the Zynq Mini-ITX, and install the i2c-tools, you should see that the resulting output from i2cdetect - l does indeed show the i2C switch and its 8 channels.

    If you don't want to go to the trouble of loading up Ubuntu, you can still compare the HDMI Vivado design to your own to see if there are any clues.

    Ron

  • 0 in reply to Former Member

    First of all thank you for your reply.
    I don't have the possibility to load Ubuntu on the board. If you have Ubuntu loaded on the board, can you give me what #i2cdetect -l return. I want to verify if I have the correct driver installed on the board.
    Thank you in advance

  • 0

     root@linaro-ubuntu-desktop:~# i2cdetect -l

    i2c-0   i2c             xiic-i2c                                              I2C adapter
    i2c-1   i2c             i2c-0-mux (chan_id 0)                   I2C adapter
    i2c-2   i2c             i2c-0-mux (chan_id 1)                   I2C adapter
    i2c-3   i2c             i2c-0-mux (chan_id 2)                   I2C adapter
    i2c-4   i2c             i2c-0-mux (chan_id 3)                   I2C adapter
    i2c-5   i2c             i2c-0-mux (chan_id 4)                   I2C adapter
    i2c-6   i2c             i2c-0-mux (chan_id 5)                   I2C adapter
    i2c-7   i2c             i2c-0-mux (chan_id 6)                   I2C adapter
    i2c-8   i2c             i2c-0-mux (chan_id 7)                   I2C adapter