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
$ z# G8 R9 w* a/ T7 v) m' { - wget https://project-downloads.drogon.net/wiringpi-latest.deb5 c; s% k/ g( I5 ]) E" _/ v5 X7 Q& f
- 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 / q0 L0 P* e( X5 y' U7 g6 F4 r
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
' l8 L6 |' n& Q9 l! K - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
% s3 H2 Z$ J! w3 C6 K9 O - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
7 j+ B/ F7 i1 R* N3 O. `+ G+ p - | | | 3.3v | | | 1 || 2 | | | 5v | | |7 @( P7 f+ J2 q; G9 ~
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |7 d% V. a7 Z1 x/ [7 f0 h
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
' s6 M1 O0 M; g9 n9 ? h6 h - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 | A0 v6 J. r6 o! K+ E" w
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |1 z2 ]/ ]# \5 e/ z
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |2 V7 o: p5 n( S
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |) p6 w% G& ^, y6 G: M+ G% j
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
+ S, _# o/ Q5 _+ \3 o - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |% j2 N9 `0 T; t
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
5 u, {; F; D' S% Y! N' e - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
" B# _( c/ `8 v" b6 C - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |9 Z% B8 S b% l
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |2 K& J7 c- y& i/ o) E
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |: X' ^) y7 h/ A3 j
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
+ ?" G& I b8 R: B! M1 e5 \3 O - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
$ l2 m7 K( Z, a' p7 l - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |' Q1 V; ?+ i$ q4 \; ]4 u
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |+ ~' E, l' [& M3 _( D7 U
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |% M1 o6 o' E: Z' b
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
# u* T# v w# j; Z/ w - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
: \' Q+ B1 _7 Y$ Z3 c. u" W2 a* ^: F - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+ k/ U. N" i; S- f - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+! _# d+ N S" M7 i
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: 6 ^( t5 g% } N: \( @+ \
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 # {9 _$ a/ f) t3 U {& ?
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