Two-Button LED Blink Driver for Raspberry Pi

This is a simple Linux kernel module that uses two GPIO buttons to control the blink frequency of an LED on a Raspberry Pi.

Features

• Uses GPIO buttons to increase or decrease the LED blink frequency
• Implements a polling mechanism using a kernel thread
• Adjustable blink frequency
• Works on Raspberry Pi 2B (tested with GPIO18 for LED, GPIO23 and GPIO24 for buttons)

Requirements

• Raspberry Pi 2B (or similar device with GPIO support)
• Linux kernel with module support
• Build tools (make, gcc, linux-headers package for your kernel)

Installation

1. Clone the repository:

git clone https://github.com/galitianu/two_button_blink.git
cd two-button-led-driver

2. Build the module:

make

3. Load the module:

sudo insmod two_button_blink.ko

4. Check if the device is registered:

dmesg | grep "two_button_blink"

5. Test functionality:

• Press the increment button (GPIO23) to increase blink frequency
• Press the decrement button (GPIO24) to decrease blink frequency

To see frequency changes being registered in real time, use sudo dmesg -wH

Unloading the Module

To remove the module, run:

sudo rmmod two_button_blink

License

This project is licensed under the GPLv2 license.

Author

Andrei Galitianu