Raspberry Pi Advanced Guide wiringPi Tutorial C Programming GPIO Buttons POSIX MultiThreading

############################# Video Source: www.youtube.com/watch?v=gymfmJIrc3g

***************************************** • Update, March 2024: • WiringPi has been updated to support the latest Raspberry Pi 4/5, but it is not included with default Raspberry Pi OS image. You can use the following commands in your Raspberry Pi Terminal to get WiringPi installed: • git clone https://github.com/mheidenreich/wirin... • cd wiringPiBasics • chmod u+x update_wiringpi.sh • sudo ./update_wiringpi.sh • The above will give you access to the 'gpio' command and you will be able to compile C programs that use wiringPi library, for example: • gcc -Wall blink.c -lwiringPi -o blink • ***************************************** • This 2-part Raspberry Pi GPIO tutorial shows how to correctly use buttons with wiringPi (C Programming). While I use the buttons to control LEDs, you can use the same approach with any other electronic components (or code in a subroutine/function in general). • If you are using Raspberry Pi 4 you may receive an error when attempting to use the gpio command. Follow this guide to fix it: • http://wiringpi.com/wiringpi-updated-... • Part 1 video gives a general overview of wiringPi as of today, explains the concept of pull-up and pull-down resistors and demonstrates the circuit used in this tutorial. • Part 2 video covers the C coding part of this project, including: • GPIO port initialization and safe deactivation • Asynchronous button handlers using wiringPi interrupts • Button de-bouncing using time and sampling methods • Button callbacks using POSIX multi-threading • 0:00 Intro • 0:14 Basic Program Setup • 2:24 Basic Button (Naive Method) • 3:10 Basic Button (Interrupt Method) • 4:52 Button De-Bouncing (Method 1 - Time Interval) • 7:51 Multi-Threaded Button Callbacks • 10:10 Button De-Bouncing (Method 2 - Sampling) • 11:30 Wrap-Up • Full code: https://github.com/mheidenreich/butto... • (Note: code posted may contain small updates and/or bug fixes not shown in the video) • Disclaimer: • Raspberry Pi and the distinct logo are a trademark of the Raspberry Pi Foundation. • Music: Endless Motion By Bensound.com, https://www.bensound.com/

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