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
" A. x" {7 ]" k8 X - wget https://project-downloads.drogon.net/wiringpi-latest.deb2 _2 D4 @2 K0 A6 M7 w
- 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
+ @' S- l4 D$ d8 H- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
/ K, z& g6 k3 c0 F. k - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |' E9 Q: W7 R8 N# G8 |8 Y0 ?2 t+ {
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+5 u! _) }( F2 p; r2 b
- | | | 3.3v | | | 1 || 2 | | | 5v | | |
$ O. x4 N8 ^- n: r! J - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |& l& k+ u: _. ]. J- T$ e& d; p ]( \
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
+ N x t. D/ Y2 c/ Y$ c1 _ - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |& Q" D+ O( S9 G/ w$ h3 {
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |7 H' M' V1 h; r/ F, d0 p- g' X
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 | @7 m- _0 K% d K9 g" E4 K4 S
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
" _) G2 s2 o9 `+ M0 Z$ M - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |" r a0 ^* G3 A1 X9 f
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
2 \/ f* {- v N' o- ~ - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |) P! g, O$ G: S7 ?
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |7 N7 U/ O, m! m) `+ c
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |' i* w& A2 a" @8 m
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
; @& U5 @7 f1 ~) i1 [ - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |) z( h A" `( c9 L% S N- N9 Z' ^
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
2 I& @) b. }& h. F+ a8 C - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |# N4 p! Q" j* q6 P' p( h
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
6 C' e9 r* S" F - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
1 G+ X5 ?* Q! _" b8 R" V - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |8 P( N5 F) } C- X6 U+ P
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
7 j; ^! O! V; f, B* A: [$ x - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
$ ?2 ?( C8 e1 }+ @" n' Y - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
5 R c3 i' {& ~ - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
b I7 I$ d) a. k' o1 J+ S) Y
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:
9 J% R8 i* u! R- [$ M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 ; y4 G, A4 K Z( q0 b8 s
) p q/ `6 X& K1 L |