GPIOlib on Torizon OS 6.7.0

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To create a custom Torizon OS image with GPIO functionality and proper pin mapping, you need to follow these steps:

1. Set Up Your Development Environment:

   • Ensure you have TorizonCore Builder installed on your Linux desktop. You can follow the TorizonCore Builder Getting Started Guide for installation instructions.

2. Create a Custom Device Tree:

   • You need to modify the device tree to configure the GPIO pins as required. The device tree source files (.dts) define the hardware configuration, including GPIO pin mappings.

3. Modify the Device Tree:

   • Locate the device tree source file for your specific module (Colibri iMX8X). You can find the base device tree files in the Toradex GitHub repository or in the TorizonCore Builder workspace.

   • Create a device tree overlay to modify the GPIO configuration. Here is an example of how to create a device tree overlay:

     /dts-v1/;
     /plugin/;
     
     / {
         compatible = "toradex,colibri-imx8x-eval-v3";
     };
     
     &iomuxc {
         pinctrl_gpio: pinctrl_gpio {
             fsl,pins = <
                 MX8QXP_I2C0_SCL_LSIO_GPIO0_IO12 0x06000020
                 MX8QXP_I2C0_SDA_LSIO_GPIO0_IO13 0x06000020
             >;
         };
     };
     
     &gpio0 {
         status = "okay";
     };
     

     This example configures two GPIO pins (GPIO0_IO12 and GPIO0_IO13) on the Colibri iMX8X. Adjust the pin numbers and configurations as needed for your application.

4. Build the Custom TorizonCore Image:

   • Use TorizonCore Builder to integrate your custom device tree overlay into the TorizonCore image. Here is a basic example of how to do this:

     # Initialize the TorizonCore Builder workspace
     torizoncore-builder init --device colibri-imx8x
     
     # Add your custom device tree overlay
     torizoncore-builder dt checkout
     cp path/to/your/custom-overlay.dts device-trees/overlays/
     torizoncore-builder dt compile
     
     # Bundle the custom device tree into the TorizonCore image
     torizoncore-builder bundle --output-dir custom-torizon-image
     

5. Deploy the Custom Image:

   • Flash the custom TorizonCore image to your Colibri iMX8X module using Toradex Easy Installer or other suitable methods.

6. Verify GPIO Functionality:

   • Once the custom image is running on your module, you can use the libgpiod tools to verify the GPIO functionality. For example, you can use gpioset and gpioget to control and read the GPIO pins.

     # List available GPIO chips
     gpiodetect
     
     # Get information about GPIO lines
     gpioinfo gpiochip0
     
     # Set a GPIO line to high
     gpioset gpiochip0 12=1
     
     # Read the value of a GPIO line
     gpioget gpiochip0 12
     

By following these steps, you should be able to create a custom Torizon OS image with the required GPIO functionality and pin mapping for your Colibri iMX8X module. If you encounter any issues or need further assistance, feel free to ask the Toradex Community or refer to the Toradex Developer Center.

Please, also check if these links can help you solve your problem:

External libraries with Torizon visual studio extension

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Custom device tree apalis imx8.