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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$ D% F" [% M. R- D+ I$ Y
- wget https://project-downloads.drogon.net/wiringpi-latest.deb; n" w6 t9 R# W0 P" Y' ~
- 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 0 v3 r q2 G& \
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+' ]" c$ N$ v. K9 \
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
( v& \2 }$ H) H9 ]$ d9 e' r" V% ^8 j - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
' n3 ]5 |; W5 Y) d# `. B1 A - | | | 3.3v | | | 1 || 2 | | | 5v | | |
, ~! a" y$ X- z. \' J; Y" H - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
1 j' @0 E5 G& S. u; B - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
- B2 {: C r: s$ e: o( K4 P - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |' V3 j9 ?6 D$ d( P6 b
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
8 o( _6 z6 A/ b2 j; ~ - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
7 g" [# s" [. c, A+ _ - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
1 k: J7 M1 e: o! s& a5 U - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |8 k6 g1 ?' J u8 Z* `- _( U
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
1 m5 D1 X2 O- n3 w k; ^ - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |% d( R6 x7 H+ M# K
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |' b+ W3 j( [1 A
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
6 c2 A, z" b3 i: Q; s9 R5 ~# \ - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |6 x9 b0 r% h$ I9 Y- M- {2 T0 E
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |4 Z, X4 l( G0 z$ R5 h
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |* a/ w( V% e1 x4 K! b
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
& `7 t% ^, g- Q6 I) a/ x- _ - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
/ F! y+ m. e- v6 ?8 I6 X2 E - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
- k( I% F# `7 T: \ - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
3 A" `! ]) D J - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
4 K. ?# C0 F4 S4 f9 i3 V) l$ |7 q K - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+6 ]4 k. M* N5 F7 I/ u& S. |. s8 J
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
8 @3 x; p0 m0 V$ S' | - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
$ L7 v1 E1 k/ ^, m( A
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: + L* c& z& T8 g, s: c5 A6 d9 `4 Z1 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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