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 j- M U4 A9 E- Q; B8 \
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
8 z; U D* A! W - 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 y* _' d8 s, o# `0 [
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+4 W: e; Q, `4 z$ @3 s9 q
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |7 H- m4 E8 O0 w- f* `' M) u
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+7 F: F2 `% F, Y& U8 O
- | | | 3.3v | | | 1 || 2 | | | 5v | | |
8 M) I2 z" R) Q" N - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |, [* [! }5 e& ?9 Y+ w7 L/ t8 ~3 [
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |' _ i# s) N; i+ b5 D& ?- J
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
; I: ?" H c/ {! r4 U- d - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |$ C# k- H; z; v$ n
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
d! p9 C2 N0 s" L8 O7 ? Z$ a - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
V! r+ `5 V" S" k - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |7 S( S0 e; J/ X, S
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |$ O& v, Y; r/ f3 @# I! ?1 c/ [
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |* t2 F' `. |% d5 _( M& o; U3 z% b
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
! ?; l% n* G% C4 Q5 w) w - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |+ i+ b# F7 b' \3 X9 E' G: x6 i
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
/ q0 U1 d. z* s: g; ?4 k - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
& m2 t# }4 p* x4 |- v' N) ?" w5 a3 o - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |6 p4 W7 W L# Y1 x; m: X
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |( K( |8 Q3 x6 d" L( K
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
, m5 i1 B2 E# Q3 B2 H2 M - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
3 T: z7 {5 t$ Z8 f% n* C' b: `9 x - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
B5 t' W) s4 M0 n9 _. W; @ - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
8 k& E$ l& M: t - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+3 W5 z: @) s& Q) n" B) ~8 S( E
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |' u$ i. D9 {8 E0 p* X& g
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
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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: 2 r% r# R$ _/ ]0 R. C! h X8 Y. u
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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