最新发布的树莓派4B在烧录了官方系统buster以后,如果直接使用gpio readall去查看GPIO会出现错误。无法识别的情况,需要根据以下步骤进行wiringPi的更新: 登陆后打开一个终端输入: - cd /tmp
4 \5 q2 E5 _* V% A - wget https://project-downloads.drogon.net/wiringpi-latest.deb) N6 ^) s) b( D6 S
- sudo dpkg -i wiringpi-latest.deb
复制代码然后再使用 检查版本信息,确保版本为:2.52即可。 然后再执行:gpio readall
5 R @, Z, R0 m) T# _4 _7 u- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
& \5 ?, n% z; K H. ~8 G% n+ E% G - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |* [/ ~+ U1 Y1 |& D- B/ o; W0 i
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+- p- H6 H4 w9 k
- | | | 3.3v | | | 1 || 2 | | | 5v | | |1 Z6 |- m# {6 S( N- Z
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
( Q+ Y9 l# @% x, [( {8 V& c - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
+ t1 B& U9 L; c) O W - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |- M4 R! g( ?! I: _$ l/ f1 e
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
p: ~8 f& L, p' r# z3 A* h - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
; S5 F1 ?6 S$ M7 t* ?' L - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | | h& e- Y1 Q& m7 I4 T7 ~' p
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
3 D- j3 K7 ~( l7 I% C - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
6 ?- a, K' }- M2 c) f7 P' Q - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |0 w' L4 Y6 {0 O0 I
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
6 V, p* y" X+ t: x6 v9 L3 M - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |+ ]; H9 N% t( M9 y+ h' k
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
' U0 q% t5 N, j* T& p - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
! X5 c7 s0 }& S# C- m# V: `2 T - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
4 f1 A- l* [# l' ~7 T$ M - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
' d8 f6 X; _" C - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
1 V% f0 D' W. k - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |* K' l. T1 \) @# N9 V
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
1 }% r: g" W. J9 m' M - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |. s; G r4 q7 a, f9 h$ H6 f6 R
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
* f" E0 v# }/ D* W) r+ z% \ - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
5 J$ O" H! N8 L3 q! s - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
0 N! T* I6 n0 I7 z1 ~2 F2 k7 Q
复制代码这时候就可以继续像往常那样使用GPIO的引脚进行编程了。 我们尝试一下使用gpio 引脚点亮一个LED灯。LED灯接在物理引脚12号,名称GPIO.1 针对WPi 引脚为1, BCM引脚为18号。 编写一个C源码:led.c 调用gcc编译: gcc -o led -lwiringPi led.c 执行: ./led 终端显示:
* G5 s: w7 Q, F由于手头的电阻阻值比较大,效果不明显,所以去掉了电阻,实际上大家应该加个220欧姆的电阻来保护LED
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