linux_driver_tutorial's Introduction

Linux Driver Tutorial

Here you can find examples for simple Linux Kernel Modules and Linux Drivers.

Preparation

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-headers

Raspberry 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 upgrade

You also need the build utils (make, gcc, ...) but they come preinstalled on Raspbian.

Content

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