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Enable I2C-3 Interface

Since I2C-3 is occupied by the camera by default, it is necessary to comment out the camera's occupation in the device tree first. In this article, we take the SDK path /home/ubuntu/Luckfox-core3566/230920 as an example. Please perform the following steps according to your actual path.

1. Device Tree Section​

  1. Enter the device tree directory and modify the corresponding device tree file. Here, we take HDMI output as an example.

    root@ubuntu:/home/ubuntu/Luckfox-core3566/230920/kernel/arch/arm64/boot/dts/rockchip# vim core3566-hdmi-lp4x-v1-linux.dts

  2. Comment out the camera section.

  3. Add the I2C-3 device tree.

    root@ubuntu:/home/ubuntu/Luckfox-core3566/230920/kernel/arch/arm64/boot/dts/rockchip# vim core3566-base.dtsi 
    &i2c3 {
        pinctrl-0 = <&i2c3m1_xfer>;
        status = "okay";
    };
    • The result should be as follows:

2. Compilation​

  1. After modifying the device tree, return to the SDK directory and compile the image.

    ./build.sh lunch
    export RK_ROOTFS_SYSTEM=debian
    ./build.sh

  2. Use a command to view I2C devices.