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" {: ?/ q1 A) N! F# w6 Z
- wget https://project-downloads.drogon.net/wiringpi-latest.deb2 s& S7 W5 J# o7 c# V2 R3 c9 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
: [! u N! H' G1 b, a- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+; c z6 c& I8 \2 C" o
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |- d/ A# E$ ]# \4 B, y+ X3 a3 k3 Q$ W
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+9 h) x. [% k: R
- | | | 3.3v | | | 1 || 2 | | | 5v | | |+ D' v3 M. {' i5 x4 ]1 j
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
4 n/ t9 \0 C8 J) c - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
: i; X5 b) g7 S! k* N1 u% [& d - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
3 [# K0 X- g8 k - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |# u9 c, ?2 y. `" N1 t' f6 @7 J. r
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |0 X" |0 w- _* ~2 e8 B, [6 _
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
; {( Z' F) h5 v: |+ {3 h - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |4 y# T# \2 K) V+ l
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
5 g9 k6 } n, E( w1 y3 K - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
. z+ V# x, c1 k L5 }, j - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
9 [) m1 z" b' |# S: d; U/ \ - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
5 l/ l4 k8 |$ x2 e - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |* n8 O2 Q0 ?! v2 w e
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |5 { G7 @5 l8 }, \' o- U& w, H
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |6 D6 b e: f0 ?: {9 L
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |* R/ C0 s" b" w G* H# A! R
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |5 A5 E9 n( e& L( S6 z8 {1 |2 l
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |2 h9 A" t0 X! E6 |+ D
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
' i2 z+ D9 g7 Q - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |( q; ]+ R) q6 S/ H
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
?6 E0 f! P% n9 `+ M; h. J& ]- ` - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |/ ?& X% V" p, B( F+ N& l. D
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+) k3 S: `8 W! R
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:
* G* f) m' g d& h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
* t0 j9 ]% s4 f% M# @( I8 J2 P9 Z
M2 a1 g' w# A: S! m |