Here you can find examples for simple Linux Kernel Modules and Linux Drivers.
I used a Raspberry Pi 3 to develop and test my modules and drivers. To compile them, you need to install the Kernel headers on your Pi. On Raspbian you can do this with the following command:
sudo apt update
sudo apt install raspberrypi-kernel-headersRaspberry Pi OS is only installs the latest kernel headers. So, make sure, you are running the latest kernel. You can do this by running:
sudo apt upgradeYou also need the build utils (make, gcc, ...) but they come preinstalled on Raspbian.
In this repo you can find examples for:
- Simple Kernel Module
- Device Numbers and Device Files
- Create device file in driver and callbacks
- GPIO Driver
- Text LCD Driver
- PWM Module
- Temperature Sensor (I2C)
- Timer in Linux Kernel Modules
- High Resolution Timer in Linux Kernel Modules
- Accessing SPI with a Linux Kernel Module (BMP280 sensor again)
- Using a GPIO Interrupt in a Linux Kernel Module
- Using Parameters in a Linux Kernel Module
- IOCTL in a Linux Kernel Module
- Threads in a Linux Kernel Module
- Sending a signal from a Linux Kernel Module to an userspace application
- The poll callback
- Waitqueues in a Linux Kernel Module
- Create procfs entries from a Linux Kernel Module
- Create sysfs entries from a Linux Kernel Module
- Parse the device tree from a Linux Kernel Module to get the deivce properties of a specific device
- Device Tree GPIO Driver
- Device Tree Driver for I2C Device
- Dynamical memory management in a Linux Kernel module
- Serial (UART) Driver
- Industrial IO compatible driver for an ATMEGA I2C ADC
- Device Tree SPI Driver (IIO compatible driver for Atmega SPI ADC)
- Misc Device
- Mutex for exclusive access to shared resource
For more information about my Linux Driver examples check out my videos and my playlist
If you want to support me, you can buy me a coffee buymeacoffee.com/johannes4linux.