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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
3 L6 a: H" A* \2 Y# T - wget https://project-downloads.drogon.net/wiringpi-latest.deb P# s2 V6 v2 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 3 r) B+ D' g/ Y
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
1 I( |& o) W8 d x6 w3 l3 r - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
( {" S* m0 T' k2 c" r2 R. v4 [ - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+0 r1 P% Q1 w$ s* C; G! L
- | | | 3.3v | | | 1 || 2 | | | 5v | | |- B7 M% p% G, F$ V
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | | O) K8 X8 P' R, b
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
+ I5 [/ r; K, `! B - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |9 `9 r& {+ T: |0 ~5 C* a& C7 d4 }
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
2 `" G4 z1 }. @: y - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
4 w( G* v- K4 n6 x0 V - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | | x: C) U$ e. X3 w/ J% O/ ~
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |5 X& `9 V, g' ~$ p5 ?. b% a
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
: W, O3 Y7 a9 n& w - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
2 p% A+ y# J4 _4 m5 M" g+ u - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
8 j1 k" e9 M; P) ~$ p8 E - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |9 y! R5 q6 G1 |. A6 K& v
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |& v! R, Z) B! }6 Y/ I
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |& b& m, C& |2 a' }! e# T: \
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |5 c* {# F0 q3 k/ \
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 | o& f2 f) b* M O# t# [, N
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |% f$ [9 W6 G* ]( h
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |. M& {, ]+ W" z8 X Y g
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |5 n( N1 v4 r: r2 w" c, [$ Q( t- b% ]
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |" Y- j& j- E; K' k, R) t
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
4 ?/ w: G d) Y% O8 q' @, g6 W - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |+ A: F; |% ]8 R. a# a! i* y4 u
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
5 D# \: H5 m7 _, J: @
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: ! ]* f- j+ d) A& d- N- l& @9 ^2 S
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 - d2 v& I, }+ `' a" n5 N
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