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# z7 f6 b' }% b. c
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
. O7 k. a) l% J% K5 J- [ - 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
2 O: g: I9 z) \7 R6 Q1 k- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
* k5 c, G) B. x& d t! {# E - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
6 S1 K9 Q3 z" i. ^% h4 [ - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
* \! X3 ^- i+ ? - | | | 3.3v | | | 1 || 2 | | | 5v | | |
& M, e0 @% d6 }, z6 b' } y0 I' g - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |7 {9 @7 {1 q3 j. [* a5 S! I a+ w
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |- z6 I1 y2 y1 C; K. m) T
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |5 Q0 r" L% B: }# p8 H, p( d
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |# @* z# \# X7 Y
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
/ @0 U/ L4 `- }) x) g4 m - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
- ^% C' w, p. d - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
* Q3 H: J4 r& A3 ]( `$ \9 }# P - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |; Q6 m* X; Q8 j3 a$ Z. Y( q
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |* t% t6 [; t9 u q5 r
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
: q8 u% z4 W) Q7 p* U# z# A - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |" g8 k1 Z8 [5 I1 B& @
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
5 A6 V0 \/ {; f# K1 j" f - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
2 o2 P: B! N: u - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |% g' T* }$ t( u6 k6 B3 `. c* I
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |. m3 C e( b7 w! k" {
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
, ?5 |* [% J# A; E+ H" W - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
3 I5 P* H) s5 v) l' V6 k( c - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |* Z: u9 L6 [; y# `
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
5 T1 G7 o5 d, k# Y X7 k- Z; b - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+5 B" e- P. B' h+ }% ?
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |3 P& T4 Y+ n- W5 M8 W' F
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+. J2 W( d7 u$ C" C
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:
6 O2 C8 s! y! W$ 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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