Raspi_3bPlus_GPIO_LED_example_code

To want to learn how to write Linux driver, this will be a reference

Usage:

1. use root user

   • su

2. enter project directory

   • cd raspi_led

3. compile and load module/user space app

   • ./build.sh

   The script run as following steps

   2-1) gcc raspi_led_test.c -o raspi_led_test (gcc for raspi test file)

    - raspi_led_test
   

   2-2) make (reapi led kernel module)

    - raspi_led.ko
   

   2-3) remove raspi_led module if you had loaded

   2-4) load raspi led module

    - sudo insmod raspi_led.ko
   

4. Usage:

   ./raspi_led_test -w <ON_OFF>

   ex: (pull high on GPIO BCM pin 2) ./raspi_led_test -w 2 1

   ex: (pull low on GPIO BCM pin 3) ./raspi_led_test -w 3 0

5. Shell script usage : ./respi_led_test.sh

   will pull high on GPIO BCM pin one by one from 2->3->4->5->6->7->8->9

   then

   will pull low on GPIO BCM pin one by one from 2->3->4->5->6->7->8->9

6. There is a PyQt5 GUI interface to make GPIO on/off

   But you will need to insatll PyQt5 package

   (6-1) Ubuntu:sudo apt-get install python3-pyqt5 or

   (6-2) to install by pip/pip3 : pip install PyQt5

   Usage: to launch GUI APP.

   python3 ./raspi_led_GUI/pyqt.py

PyQt5 GUI - GPIO controller

BCM GPIO PINOUT