About this repo

This repository contains a simple example of a character driver module for linux and a sample of an user application to communicate with the driver.

Using the driver code

Compiling the driver

To compile the driver module run make in the build directory.

Loading the driver

Using the script

To load the driver module using the provided script use the following command:

sudo sh chardriverRun.sh 1 0

To enable tail output set the second parameter to '1'

sudo sh chardriverRun.sh 1 1

Without the script

To load the driver module without the use of the script use the following command:

sudo nsmod CharDriver.ko

Unloading the driver

Using the script

To unload the driver module using the provided script use the following command:

sudo sh chardriverRun.sh 2 0

To enable tail output set the second parameter to '1'

sudo sh chardriverRun.sh 2 1

Without the script

To load the driver module without the use of the script use the following command:

sudo rmmod CharDriver.ko

Script input options

The list of possible input/parameter combinations for the script are as follows:

sudo sh chardriverRun.sh x y

• Parameter 1 (x):
  • 0 : dmesg
  • 1 : Load module
  • 2 : Unload module
  • 3 : Load and unload moule
• Parameter 2 (y):
  • 0 : desable tail
  • 1 : enable tail

The above list can be obtained by running the following command:

sudo sh chardriverRun.sh

Using the user application code

Switch to the "UserApp" folder to work with the user application.

Compiling the user application

Run the following command to compile:

gcc -o UappCD.o UappCD.c

Running the user application

Run the below command to run the user application and interact with the driver:

./UappCD.o