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" B7 b1 f" H; K+ [
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
4 l& N' m- h" S/ 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 ( M0 Z% [; G( V, L
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+7 K- v( w6 K( H+ v* y: y/ O
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |7 f) k4 s; d0 D% h
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
9 H/ _3 `" V+ T$ @ - | | | 3.3v | | | 1 || 2 | | | 5v | | |# J5 U4 C; t7 D7 v5 _0 i! P
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |/ V! T9 R/ p& M2 H% q: M( O3 W1 Q6 ?) C* K
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |4 t; U5 a u2 O4 X x
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
$ B# e! @. Q" z+ S; z* Z - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
1 u+ ]4 G8 k/ V% m$ D - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
9 b5 z, E: d9 m" C - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
. A+ @1 t9 V; P" L" f, a - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |1 b( f; x& `1 k6 w& c+ R
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |; X q& | F, ?5 g
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |7 r5 M: \4 b0 M# L8 m* l6 u6 T
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
, I- j' k. B; U$ x# i - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
1 R' i! `0 u1 v F' T( y, @ - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
+ y ~: s% M3 ~7 b - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
8 q( x% |$ s4 m+ a+ x8 q" p - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
6 ~2 ~% ]+ a+ k3 _1 ^ - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |$ @* {: q! ^9 `1 w" I# f
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
# v! z6 V, |/ A* Q - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
$ @5 [; o6 K- w6 E/ P1 d% C6 I2 { - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
9 | q. n4 z& s1 f$ s7 j - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |( D& b) [5 k7 ]$ B
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
% C2 U) g! ?) g$ U G: v - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
4 C0 P, b* L: d4 K+ s - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+2 x+ @# {3 h) m% Z" ]2 g
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:
" m. z& I h0 Y/ K' W6 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
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