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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+ L/ o2 P( v' a8 {; c) G4 }1 U6 }
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
% ]; H/ X8 W+ y) z: U+ m - 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
! F+ |4 u z* F1 G: Z! }- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+0 ^ j+ N( ` @* U9 m4 t
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
8 ?4 L8 P& x/ j+ X0 |5 C5 L$ f) Z: J - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+9 ^! B# a5 Y7 V( b- f0 |9 F6 w
- | | | 3.3v | | | 1 || 2 | | | 5v | | |% U& p1 n" e9 m/ E9 U3 B
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |* R1 {5 ^* i- b; s3 n9 w! B; A1 P) L
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
9 O6 k8 U4 e: d1 T - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
, {+ c: c% w* b/ ]1 o - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |' W8 ~- s' D* ?3 c
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
" ~% u. h. q; q - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |* ?, l* S1 I! \. @9 z$ s
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
! r6 W5 b7 H* @& E- ? - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |) @9 H: g" v% X6 g1 q
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
/ h) w2 |% d- m, F! I' M" N - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
* z" ]2 r O/ X( w; u# B# a - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
! }- D/ G) F, Z3 P3 `5 F' `. a - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |4 t2 g. Q7 m s8 F
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |4 x# c' U' @( ~1 _. |
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
9 F0 B0 ~6 m7 L/ Y! K5 G% S" M* y: \ - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
5 t" E: g/ p6 e, k4 M4 j - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |' e5 [, G0 |, ]
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |8 ?: y6 J7 B* f8 Y9 p
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |- b4 X- J. J' }# d# G3 S
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |+ Q, G/ p9 ?1 A, t* Y, q$ [
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
& i+ @0 b- o- h4 t: N - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |# D, o+ e( h- i" C# w2 r* l
- +-----+-----+---------+------+---+---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:
$ Q0 H6 i3 d* m+ W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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