WiringPi

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WiringPi is a PIN based GPIO access library written in C for the BCM2835, BCM2836 and BCM2837 SoC devices used in all Raspberry Pi. versions. The source code is not publicly available but may be made available to those who wish commercial support.

It is designed for use with C and RTB (BASIC) ON THE RASPBERRY PI ONLY.

It’s designed to be familiar to people who have used the Arduino “wiring” system1 and is intended for use by experienced C/C++ programmers.

Install

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To update or install on a Raspbian-Lite system:

sudo apt-get install wiringpi

Check with:

gpio -v

Pins definition of WiringPi GPIO Library:

gpio readall

WiringPi updated to 2.52 for the Raspberry Pi 4B

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Just a quick post to let you know that you’ll need a new wiringPi for the Raspberry Pi 4B.

To upgrade:

cd /tmp
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb

Example

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Use the nano tool that comes with the Raspberry PI system to create a new “blick.c” file:

sudo nano blink.c

Enter the following code in the file:

#include <wiringPi.h>
int main (void)
{
  wiringPiSetup () ;
  pinMode (1, OUTPUT) ;
  for (;;)
  {
    digitalWrite (1, HIGH) ; 
    delay (500) ;
    digitalWrite (1,  LOW) ; 
    delay (500) ;
  }
  return 0 ;
}

When the editing is complete, save the file by typing the following command on the keyboard and exit the nano editor:

Ctrl+O
Ctrl+C

then to compile and run, you would enter:

gcc -Wall -o blink blink.c -lwiringPi
sudo ./blink

To see the output of this, you would need to connect a single LED to the GPIO connector of the Raspberry Pi as follows:

and if all goes well, you should see the LED flashing once a second.

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End!