Enabling GPIO sysfs interface for Yocto Mickeyboard in Linux Kernel

Enabling GPIO sysfs Interface in Yocto Mickledore Linux Kernel

In this article, we will discuss how to enable the GPIO sysfs interface in the Yocto Mickledore Linux kernel. This is a useful technique for interacting with the General Purpose Input/Output (GPIO) pins on a hardware device, allowing an application to run on a new Yocto Mickledore image created.

Introduction to GPIO sysfs Interface

The GPIO sysfs interface is a virtual file system that provides a way to access and control the GPIO pins on a hardware device. It allows an application to read and write to the GPIO pins by interacting with special files located in the /sys directory.

Enabling GPIO sysfs Interface in Yocto Mickledore Linux Kernel

To enable the GPIO sysfs interface in the Yocto Mickledore Linux kernel, you will need to do the following:

1. Obtain the kernel source code for the Yocto Mickledore image.
2. Navigate to the kernel source code directory.
3. Open the .config file in a text editor.
4. Search for the CONFIG_GPIO_SYSFS option and ensure that it is set to y.
5. Save and close the .config file.
6. Recompile the kernel with the updated configuration.
7. Install the new kernel on the Yocto Mickledore image.

Verifying GPIO sysfs Interface

To verify that the GPIO sysfs interface has been enabled, you can do the following:

1. Connect to the Yocto Mickledore image via SSH or a serial console.
2. Navigate to the /sys/class/gpio directory.
3. Check that the gpiochip* files are present.

Using GPIO sysfs Interface

Once the GPIO sysfs interface has been enabled, you can use it to control the GPIO pins on the hardware device. Here is an example of how to export a GPIO pin and set its direction:

References

• GPIO sysfs Interface Documentation
• Yocto Project Homepage
• Yocto Project Beginners Guide

This article has provided a detailed explanation of how to enable the GPIO sysfs interface in the Yocto Mickledore Linux kernel. By following the steps outlined in this article, you should be able to successfully interact with the GPIO pins on a hardware device and run your application on a new Yocto Mickledore image created.

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