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
. g, v4 y3 I( t+ ?4 b5 {: \ - wget https://project-downloads.drogon.net/wiringpi-latest.deb9 A; Q. m- O8 g9 S5 _7 l1 C
- 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
, h4 @: M/ O: q- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
! e6 M4 C. ~- R2 \- `4 H' q/ ~3 ^# N - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
3 V6 }; ]" N O" Y+ b& t! \/ w - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+8 _# t* `! |# Z; ^/ `
- | | | 3.3v | | | 1 || 2 | | | 5v | | |
B: r+ \( U2 `8 U8 n/ G" m% ] - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |) q. i; \" Q. _* h/ }+ w. ^" y
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
" L7 D1 Q4 d S( D - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |6 r& v$ {$ m7 H
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
, n y- r& E3 W+ _: J; D7 O - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |. {; G; Y+ G+ b8 G1 Z# O
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
- z: v* J! _5 x- x - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
% o4 S, Y. }& s( V- {6 B - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
/ ?4 T) e# H# K' C" F - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |7 |# ?. L! b* |9 P* _
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |- q$ @& T7 x- t9 L
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
# @: l+ F H* s( d! g) l) O/ j9 ~! C. l - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |, b$ I9 Q/ g2 T& z
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |7 E( Z" J5 R& W9 M! e! o
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
3 Y+ ^+ [6 T9 A( H% `: Z - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |2 v( C5 j/ I; Y/ C
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
/ i# o# p% _5 M7 F) j - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
: u. B+ M; y$ x( Q/ U( S6 o& x - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |, f ]0 e& H4 h U
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
8 Y7 s8 z, D6 N) Z& t! A - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----++ J, ~: b3 e0 @3 }! d9 `
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |. k/ v G' S5 G% `2 x
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
) { _0 P$ D- B, K3 H
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:
. p. C. C0 ]/ X5 ^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 * J! V& B* \/ N/ h8 ~+ F* F2 Q3 Q
& g- W6 @! ~& {5 [- q/ u5 U4 i |