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
* e9 @, N' k- h0 s) J - wget https://project-downloads.drogon.net/wiringpi-latest.deb
7 }2 ]# W0 R8 @* P - 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
- p5 x8 t1 F: j, o, o0 j1 ^- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+3 n1 r- Y( ^2 b- d' \
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |3 f( ?& |( ^3 D5 O, W, ^
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
, N- X' r/ v0 H% u' _ - | | | 3.3v | | | 1 || 2 | | | 5v | | |
8 @/ @$ S% J3 @4 S+ @* { - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |5 u) [. Q$ f6 `' I& O1 P% R
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |) D' R! E& \$ I
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
* e, e1 e' Y7 j- E: M% f+ ^, T - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
3 ~- c- _! o5 l/ { - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |( i$ `) k, W/ G
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |, x7 P7 W$ N4 X+ ^8 L
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
9 G0 a1 h! i; S3 `4 s) K: }9 | - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |, Y3 P9 a {% H8 [( j% `, @
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |# G( n5 ^' @2 F3 T
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
% \, y9 _( b: J ? - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
9 K* ~9 M5 p1 |# u) O) O. R - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |9 Z _5 M3 z6 |1 C5 S! O0 {5 P
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |/ _2 O4 W# H f$ W4 v0 _5 ?1 }
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |, P4 f4 G& p* w9 E+ u' p" R( R
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
* e6 q' {- d+ ?4 ~5 J; x0 B - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |, \( O' W9 X5 p0 k3 Y, E8 @. |& H/ J; B
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |# f# D. D% @5 Y. q8 c) ~
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
2 z K' c8 v) u4 Q8 J" H# K" ^ - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
; H- A; R' ^" ^. J( f - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
" \9 G; E) ]$ J: P1 U6 p - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |* h& |8 y* |: H+ D) C& x
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
6 N# {/ z* X4 K! X1 k$ o( c
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: 5 P! I6 K& V1 ~/ z( e
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 4 J2 b3 O; I. Z$ z, ?, [
. _. f: S4 `$ C. f: U |