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
9 A- K8 n% e0 F: x! K - wget https://project-downloads.drogon.net/wiringpi-latest.deb
8 \) @3 L, S5 Q* _1 l' R) ^$ 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
# L) p2 ~! {7 E. S- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
& z9 E6 I X. a. X$ Q - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
9 ^9 H+ A6 e3 @1 g4 I* E - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
7 S4 g6 N; i5 e, L7 q' U0 l8 h - | | | 3.3v | | | 1 || 2 | | | 5v | | |5 E9 J2 `8 R, R+ m& }7 ?+ V
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |, E7 K! {/ P1 K7 {1 z( T7 ?% V' p; L
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
3 O$ z j/ S( q/ V( r5 F - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
$ E/ k( G: E# O2 h: h. a/ p/ s( k - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |. B' r2 A8 g1 i4 n j5 e9 b
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |9 q5 @8 ^0 G' Q2 C6 F, ~
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
j& I% J4 k/ N1 C' F! [( o - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
* \1 ?' L; o; \7 u& J# } - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |# C! {2 T4 `( g a
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
( w: g+ x. z) ? - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
3 ^4 F b* K3 C) h - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
9 r2 H: m) B8 r6 H" i# A! I# y) \2 ` - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |5 \7 Y( X* ^, }& k5 ~5 T
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
7 @3 t2 f6 F1 g( r" E* b- t - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |# l& ?, e* h- p7 W' V; g$ W5 j
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |3 C1 x( e, K8 ~9 U2 R' w6 ^
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
5 c' _; N2 ?5 c# F" x1 w - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
/ B6 M, s! @! R+ L6 b# X - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |1 U$ L) Z8 _8 C# [/ ^6 @! x
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
0 _5 }1 g8 v B* q3 V8 u9 _, q - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
% I5 E9 h. I! N6 f3 U, f5 | - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |' z, x! g5 [, @) h% ?7 K
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+8 q) h2 h" ]3 [* R/ \. 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: ' c3 J. u2 U- g" P% x: }) Q' a9 F
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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