Raspberry Pi에서 GPIO를 쉽게 사용하기 위해서 WiringPi 라이브러리를 이용한다.
라즈베리파이 4b 같은 경우에는 최신버전 wiringpi가 필요하다.
1 최신버전을 설치하기 전에 기존의 wiringpi를 제거한다.
$ sudo apt purge wiringpi
$ hash -r
2. 디렉터리를 생성하고, 접근한다.
$ mkdir WORK
$ cd WORK
3. 다운로드하면, WiringPi 디렉토리가 생성된다.
$ git clone
https://github.com/WiringPi/WiringPi.git
4. 생선된 디렉토리에 접근하고 빌드하여 설치한다.
$ cd WiringPi
$ git pull origin
------------_구 버전 수정 ----------------
>>> 요즘은 안함 <<<<
$ vi wiringPi/wiringPi.c
---<768, 769 Line을 주석처리 한다.>----
768 // if (strncmp (line, "Hardware, 0) !=0)
769 // piGpioLayout0ops ("No \"Hardware\" line") ;
--------------------------------------------------------------
$ sudo ./build
All Done.
NOTE: To compile programs with wiringPi, you need to add:
-lwiringPi
to your compile line(s) To use the Gertboard, MaxDetect, etc.
code (the devLib), you need to also add:
-lwiringPiDev
to your compile line(s).
5. 설치 확인을 한다
$ gpio -v
gpio version: 3.16
Copyright (c) 2012-2025 Gordon Henderson and contributors
This is free software with ABSOLUTELY NO WARRANTY.
For details type: gpio -warranty
Hardware details:
Type: Pi 4B, Revision: 04, Memory: 4096MB, Maker: Sony UK
System details:
* Device tree present.
Model: Raspberry Pi 4 Model B Rev 1.4
* Supports full user-level GPIO access via memory.
* Supports basic user-level GPIO access via /dev/gpiomem.
* Supports basic user-level GPIO access via /dev/gpiochip (slow).
$ gpio readall
+-----+-----+---------+------+---+---Pi 4B--+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| | | 3.3v | | | 1 || 2 | | | 5v | | |
| 2 | 8 | SDA.1 | ALT0 | 1 | 3 || 4 | | | 5v | | |
| 3 | 9 | SCL.1 | ALT0 | 0 | 5 || 6 | | | 0v | | |
| 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT5 | TxD | 15 | 14 |
| | | 0v | | | 9 || 10 | 1 | ALT5 | RxD | 16 | 15 |
| 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
| 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
| 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
| | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
| 10 | 12 | MOSI | ALT0 | 0 | 19 || 20 | | | 0v | | |
| 9 | 13 | MISO | ALT0 | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
| 11 | 14 | SCLK | ALT0 | 0 | 23 || 24 | 1 | OUT | CE0 | 10 | 8 |
| | | 0v | | | 25 || 26 | 1 | OUT | CE1 | 11 | 7 |
| 0 | 30 | SDA.0 | IN | 1 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
| 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
| 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
| 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
| 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
| 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
| | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+---Pi 4B--+---+------+---------+-----+-----+
