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
; B$ r, ]$ y: x0 ^; ^3 Q - wget https://project-downloads.drogon.net/wiringpi-latest.deb
; A5 j( Y9 [, C$ j7 Q; 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
, ^ S+ _7 f& {: P! w7 L- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+ d& P: [& F6 y- J4 m
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
' U& I. V+ q( B( r1 ?, q - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
8 ?* B& K; U6 E9 }2 R0 \' _ - | | | 3.3v | | | 1 || 2 | | | 5v | | |1 a i& I9 } D4 t# B, Y3 ?
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |7 t7 G1 l7 E# q( j6 J
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
& V, p" M- P8 d' C2 T - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |1 v2 S1 B9 y3 U: _4 c/ I6 C& i
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |. M! b( [' k8 H7 H& H* u; [
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |# w% Q% s% \4 R# f S8 {
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
8 M. E# m# z* h+ g" t3 q9 A - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
! Q8 \' E% Y4 M8 j B) P' h8 u - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
4 K5 R% Z$ ^. C. H% M/ g - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
" F7 b; ?) s6 C1 z5 K* p, r - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
5 l7 |+ O4 F I' Z8 z! X4 J# F2 ` - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |+ J7 R) t2 h' d. o5 Q4 E
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |) m, b/ T6 ?) ]# ` ]- v
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |+ Y9 @( M+ l% R; O
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |) ?/ d* k9 n& ?! g* d$ Q8 o
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |- Q- L# I3 q) T- c
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
4 L1 W- s6 B- K% H0 Q7 u4 t7 b - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |0 E3 w5 f2 b3 a P
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
- _( Y+ }5 G% _+ S$ T9 z1 ^ - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
8 u. ]0 H4 G$ E e1 D: Q - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
$ y4 B- M/ e. K2 s l - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |# \% ^1 E1 K1 s# {' l1 e2 f
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+2 r. Q. g4 c5 `8 J( [# X
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: : d3 I; B2 g0 N- K* 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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