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
" J( b, P0 }) Y# ] - wget https://project-downloads.drogon.net/wiringpi-latest.deb
6 q8 P9 }+ ^0 K" A" |3 R& ?/ l# | - 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
% ]& p: X- R8 D/ |2 O8 s- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
' C' A) U* \, m4 W - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |/ [5 C& X; g: s9 J( _
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+- _" h! j R: Q7 v; P
- | | | 3.3v | | | 1 || 2 | | | 5v | | |; r8 k0 n9 G6 i0 J. M! A
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
& G& f+ i( q! i3 C& s - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
) \/ d0 i7 S4 ]% J4 b - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |9 E! K: d: r% ]+ j+ ^+ K
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |% b! h/ o4 M- R- @; M" t0 v
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |. h! Q, S! E; k5 _6 i4 m; w
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |6 p- i! U+ }8 I/ ~4 Y8 l& h
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |' T) ?& u& C# |& n. o( i
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |5 d' u O8 C- m
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |/ `5 C) D/ K5 b/ j- @
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |. H" m7 v5 p" f, E* P
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |) p) J$ q( t. `. ]7 D: K8 D, d3 Y
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
5 g; k# u6 k7 G - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
) ]* |" s! [9 Y! r' x - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |5 Y5 ^5 U0 z. j1 c
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |$ m, W2 a* G! L$ I( }
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |/ I9 Y1 H. e: c- o
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
1 _( I( ^7 t( }& d0 b/ | - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
6 v. w. p( Z! u; E4 \ - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
/ h/ l% x- q- |0 }9 S3 D - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+4 F; Z3 |8 L6 L3 w
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
: k/ |2 J" h# ?' l2 g: Z - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+/ Z8 u3 y4 ?* g( Z) z% F% z: C- Z8 k
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:
; b0 q$ J; G7 v5 h3 ?' |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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