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
0 M4 P$ u- |0 E& p6 i, a' z7 x - wget https://project-downloads.drogon.net/wiringpi-latest.deb& \. \ V9 W* v6 }( x4 B
- 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 f3 b$ |/ I7 S @4 h: ?5 h
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
" J' O8 H/ n. G4 z - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |1 f: Z, z6 [/ a: _# Y5 J
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
l, c2 j. u9 p - | | | 3.3v | | | 1 || 2 | | | 5v | | |
2 `2 @: h0 s. g! h - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
6 w& k8 y$ a& Y/ R. K$ ? - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
9 A& O; i& x7 ~9 u0 A0 ` - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |# W' v9 A5 g6 o6 b1 l% n3 |
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |, V% V' n7 E1 z+ I
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
q! u/ H2 ? S0 _- A, O7 B - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
% t. H3 m; p' J( _- _' B - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |8 V: k0 E% s) I; e* d
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |4 k6 D5 E) f5 C- w {/ D2 l
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |# S5 s2 e. f8 M4 B* K2 h$ Q
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |) }6 L! K) A; S% a
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |7 F% D+ P, k7 o5 {: V
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
6 ~) L$ D5 ?0 d+ @: V - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |: g# [" {0 i* S/ r
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |4 t" M! J( P' c$ n
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |- r& n* D, c4 h2 O
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
8 E: q1 c% e/ D* @9 B# ?. c1 j - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
- e! m3 ^: T" e: {% } - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |- b& Y7 }7 y* _3 J
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
; \# X' d' W" ?; U1 J8 Y* I - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
( s9 x7 h: Q6 z1 f" G- |8 _ - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
! L! B. B+ ^7 s% s% q - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----++ M' `# Z4 X+ b
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:
/ ^7 k0 t. F# q) r P0 q7 J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 8 [4 ]1 b! s: r( w
5 X+ T$ Y0 f( @; P2 w |