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
! R* v! b3 H. b( O# C - wget https://project-downloads.drogon.net/wiringpi-latest.deb
7 s# a% i/ R0 F( _1 G! O" 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
1 d5 v6 @' M" X- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+/ V/ j5 T/ Z& [, [6 d" T
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |5 y3 C* p9 k' A C( G
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+5 [% z0 i- C' a" m
- | | | 3.3v | | | 1 || 2 | | | 5v | | |9 N! s) d+ u' D$ l6 n3 p) W
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
8 S! T+ {. T3 L# a* T; Y - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
/ |, o9 `; p/ j' n - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |/ r$ Z7 k- s5 T
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
+ f9 p% K) f! P$ z" x( d - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
: G! q4 f! Q: F4 _2 l; K - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
- G, N" L, _$ a% D - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |# P' @+ _! i9 M' B
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |3 W3 I5 k7 ~) A# I" X4 U
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |9 L% I2 ]9 @( ?0 v, A
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |$ W2 d, A+ `6 w8 e5 z' A
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
* B6 L( ]1 g0 x* Y - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
# m3 N- S! V, ^& z) Q0 z% P - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |7 U2 }! }' e* L9 r1 [
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
5 Y: ^8 R9 ~8 }! \ v - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
' p4 E+ }" k1 P - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
: Z2 ]! j* x6 j4 v0 p& I- m - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
- w8 W& R3 e& Q5 G/ b; S - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |6 j* m2 L+ O' p/ i* N; i
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |" T" i5 z- P8 Z( A- H
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
; d% y4 L( `% _9 \ - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
4 V: I' o3 _% Q: y - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+" l/ [- _* o" Q2 V7 Q
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: ' T X5 j5 w1 |$ H/ [9 |
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 ! G( Z+ a& k6 y% U* q( q, Q' p
2 Z) D6 a% [$ w# v, } |