Sunday, January 26, 2014

Enable I2C of Raspberry Pi

By default, i2c is disabled in Raspberry Pi. To enable it, follow the step:
  • $ sudo nano /etc/modules
    add the lines:

  • $ sudo nano /etc/modprobe.d/raspi-blacklist.conf
    comment the line of
    #blacklist i2c-bcm2708

  • install i2c-tools for testing
    $ sudo apt-get install i2c-tools
  • reboot
  • After reboot, run i2c-tools to test
    run the command with -1 option for rev 2 board, or -0 for rev 1 board.
    $ sudo i2cdetect -y 1
    sudo i2cdetect -y 0
  • In my test on rev2, with no i2c device inserted:

    with Tontec 2.4-inch TFT LCD Touch Screen attached:

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