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Sharing I2C bus

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  • Sharing I2C bus

    Hello again,
    I would like to add a sensor to I2C line and according to 4DPi-24HAT specification this bus is used by touchscreen controller. As far as I know I2C this shall be not a big deal to add another slave device on the bus. Hence I have some questions:

    1. What is "bus load" made by the touchscreen controller? I do not have any osciloscope to check it
    2. Shall I use extra pull up? I guess touch screen already pulls SDA line up. I expect that wire will have 20-50cm.
    3. Are there any limiations in regards to I2C with your kernel?

    1. First question stays.
    2. I added extra pullup and it is working fine - I did not try without it.
    3. Third question stays as well.
    Last edited by jakub; 31 March 2018, 05:15 AM.