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Last Post 11 Jun 2014 01:38 PM by  Adam Ford
GPIO_140 and 141 access
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Fabrice MESPLOU
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Posts:5


--
11 Jun 2014 08:02 AM

    Hi

     

    I would use the GPIOs 140 (PCM_DR) and 141 (PCM_DX)  with Linux BSP.

    But refering to the documentation, we must put this I/O in tri-state as they are plugged to TPS65950 chip. It seems that I must use i2C bus, but how can I configure this 2 pins from Linux point of view ?

     

    Best regards.
    Adam Ford
    Advanced Member
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    Posts:794


    --
    11 Jun 2014 01:38 PM
    If you don't have swcu050g.pdf from TI, I would suggest you download it from TI. It has a complete description of the I2C registers on the TPS65950. http://www.ti.com/product...0/technicaldocuments


    To read and write the I2C registers in Linux, the tools you'll need are i2cset and i2cget. They should be located in the /usr/sbin directory
    If for some reason you don't have them or you expect to support block transfers, you can look here http://support.logicpd.co...aft/104/Default.aspx for instructions on building a newer version.


    In order to set the VIF_TRI_EN, you'll need to set bit 2 of of the VOICE_IF register (0x0f) in address group 0x49 (See Table 14-28 for details)

    /usr/sbin/i2cset -f -y 1 0x49 0x0f 0x04

    to test if this was successful, you can read the i2c bus with:

    i2cget -f -y 1 0x49 0x0f

    Let us know if you have any other issues,

    adam
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