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Enabling I2C on Raspberry Pi Yocto

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Rishab Shah edited this page Dec 7, 2021 · 4 revisions

I2C module support for Raspberry-pi

  • Motivation:
    I2C module was a new component which was unexplored for the yocto as per wikipage.
    This would serve as a reusable component for projects which use I2C based sensor and help to dedicate time to develop user-space application for the same.

  • Implementation:
    Please refer Pull Request:https://github.com/cu-ecen-aeld/yocto-assignments-base/pull/3
    Following configurations are verified for Raspberry-pi 3b+

  1. To enable I2C module, add ENABLE_I2C = 1 to local.conf
  2. To autoload I2C module, add KERNEL_MODULE_AUTOLOAD:rpi += i2c-dev i2c-bcm2708 to local.conf
    i2c-bcm2708 will vary for hardware based upon the chip supported for the hardware device.
  3. To add i2c tools support add IMAGE_INSTALL_append = i2c-tools in local.conf file.
  • Testing:
    After successful boot, following verifications would pass
  1. Run lsmod | grep i2c to verify if I2C module is loaded.
  2. Run i2c-detect -y 1 to verify that the I2C device connected to I2C bus is in good condition.

I2C_Support

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