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 /tmp8 B- {3 S8 k [) C( C
- wget https://project-downloads.drogon.net/wiringpi-latest.deb* [8 l0 ^0 p! n
- 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
. Q- ^) P& y0 s$ M6 F- f0 T+ h' A# R- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
- v. l: x: _( x- L: R - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
9 z+ s% v% n# L% s( u - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
$ |0 E( [4 R6 z4 x, f - | | | 3.3v | | | 1 || 2 | | | 5v | | |
. o5 Q6 t# O$ O" c - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |* H9 d! s O1 I" |6 \" r8 O
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |5 n# c* }0 ^8 D' `5 X
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
6 r9 ?; D" ^, X2 k. a$ O9 e4 I: |, K - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |- F. Q* y9 `/ A0 j
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
' }+ V# M* A# S - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |; e- T# O0 l9 \( g9 Y) [
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |2 ]% U' C- B- }# ~. C
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |, {) I. s& X* x- G% r! N& w
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
4 z. W2 n! B& `! {3 }% _ - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
3 E$ n& t4 t$ R2 J+ Q# M" u - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
$ ^ u R5 ~0 e - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |9 Q( k% i* r h; ?
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
5 e! ?" c! J/ H0 |; r/ f+ u - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |. e- n* o& s2 k& g, g/ f7 `/ k: {
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |; I( C* s+ C0 U3 G
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
: i2 l/ W' y6 g - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 | _5 u/ ~) k' ~9 q1 v4 q, K6 }
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |/ v# e" O' K4 i) q$ y3 H% _
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
; ?4 \9 E: ^$ g. m7 H& W# O% y - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
4 w, u, `% c [ - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |& _" H& i# r; Y8 ~& J0 X' K
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
8 |: |4 V5 ?9 D/ a
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:
$ f1 l- o( P" Z2 n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 3 u A3 X- U r0 H
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