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 O' r2 a# h4 r6 u3 \
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
9 q) x$ M {. i( \2 j# [! E/ m% u - 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
) [) U v" x# H- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+. E2 {6 q! P ?$ \' J: d
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
4 K7 j; j3 n9 M1 W2 m" M - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
$ ^+ n6 k0 D: m - | | | 3.3v | | | 1 || 2 | | | 5v | | |; }3 Y ?" U9 [
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |! b( B: I5 e- r* ~6 B( W
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
& s8 J( m9 B" N: `3 M, K8 I& h - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
2 a) o P# a- b0 W! y - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |4 V* G7 l/ C- J$ t4 f
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
" D5 z$ B' Z! p; Q - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
! ]1 H! S( Z* r. a; E! M7 M% S. I; z - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |' q+ G4 B& Q9 i1 i# g* E0 T
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
u- T) q) d. z( f1 z& s - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
a9 S2 n) R- J3 m+ Q% t - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
2 \- b( S% U% H' D5 j - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
4 m3 I/ y% |& ?7 @4 c7 R - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |3 y! p m+ V4 i" L$ ]5 X0 P( m
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
8 {2 e2 w; u% e R% d5 p9 P6 V' p# ~6 i - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |. t1 X4 A9 r! c' p8 h. ]
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
1 G' j# B+ R( w$ f# ~1 {' V - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
7 X6 r# e2 Z7 g& o4 J/ F - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
9 C4 z* ~" Q# m8 z: A3 ]0 |- @ - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |5 h |( s/ }7 V/ w: H6 C7 z
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
4 W& h9 J! T. }+ v H1 Z( { - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+8 k* b9 M6 r. C" O) A( m: J
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |8 m) t5 i4 C* f; M
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+6 a0 [7 z# f4 p" X4 \
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:
3 v7 I& x/ y6 \) w! n7 ?2 ?/ {+ }- g5 d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
1 L8 h# |- j x! K" {4 c1 ?4 t
+ W+ T# a3 y8 _. Z/ i! _% q |