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
! e2 k8 W- C$ N! t - wget https://project-downloads.drogon.net/wiringpi-latest.deb$ i" ^6 F5 y) [2 y' A
- 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
4 {7 W9 F: ^! N0 `7 t3 j& O" W" w- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
" R+ f: N6 t( F h - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
0 t$ E2 D }) o3 ]# `% C: C! _/ ] - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+; f! a _1 {+ ?. t; L
- | | | 3.3v | | | 1 || 2 | | | 5v | | |
' p3 v( {& K! B: U- C- J - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
: T6 A# z- T( s$ q3 I/ A! s - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
) X" v, U. {/ W& q( E - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
7 \& a9 z: @6 D' ~' x; F - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |' z$ I& X7 @, Z' F
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |, i w% }7 K6 a) a
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
, O0 z; Q) N2 j2 p - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |( F( E$ v* B2 M% L1 v$ D! z
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |9 t4 S! Z+ V- _
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |$ ^, W5 s# _9 w: z. |3 t
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |6 a( k1 H8 s/ P7 D+ T: I4 i
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 | C( b3 P( Q$ ^( z. A4 K% p
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
! s$ z6 u+ P W. c - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
% R8 F: s; q6 F: r8 r o: y! { - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |4 }1 A1 | V; v# ^+ j
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |7 ?4 t3 q! O& N6 @) ^
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
5 H' I8 l4 C) _- Y2 U - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |/ S& v. u: D8 N7 }4 m! z
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |2 Z4 T' C( s/ f, g
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
5 s* o. o0 F1 L K E& Z - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
8 h1 Y8 Y0 ^) M* i/ ]% C - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
! b; W/ N8 P `+ e; Y" u% @ - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+5 J' x* ~# Y9 K8 m5 e, w; e
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:
+ S: E, g/ r* E( \3 B/ F& Q) ]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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