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
8 t) `! ~: `* ^. k- F4 n - wget https://project-downloads.drogon.net/wiringpi-latest.deb& G; _& M+ y F' V# u8 `& k1 ^
- 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 ( Y+ G" H8 Z- ?/ ]
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+# Z" X; q$ c; j6 G% X
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
- m4 s$ \: m9 y% x$ C" C% b! ]$ h - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
4 l. ^8 Y9 x0 G& E6 ~1 T0 j. a8 D - | | | 3.3v | | | 1 || 2 | | | 5v | | |% b( k* Q r' i8 g' D. K
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |( C7 d1 C) l6 C! g; c
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |; U }" a% a) K, f3 e9 `
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
, ~" _' K+ j7 o# k. M - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
$ Y6 S9 ]. R; j - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
1 K, d3 a |9 ?$ J( ` - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
0 u/ ` D1 }) S) N1 c* B - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |6 a8 v) I6 R( S% y
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |' O7 t% s( H9 h" I% f5 I- M$ f
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |! y" c2 ~/ q) C; ~' @
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 | v$ Q! x$ [- f( P8 L. i( X
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
5 y3 v6 O& f" M! C) q - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
: W% V* E+ r7 F* U# O( @ - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
& K. b# Z& M* O, f& W6 C2 _+ b - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |5 ^( B% P, i+ w I
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
% V$ R! B8 |3 p% e' i - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |$ L2 l7 N( H! S( Z( D* t
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |$ ~$ r9 ? u" M4 W- Q, @( Z
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
: x) n$ q# S, T R# \ - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
1 d9 a( r/ X) H: c8 ? g# M6 D S6 t - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+4 n1 ^! h! {! l; Y
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
8 a" k" w( R9 ]3 ]# F - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+: ?/ Z$ n' s) \+ {( g9 o1 E
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:
* h. X0 |4 Y; l- i# L; y8 x7 c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 . I9 U M) n1 I v% |# p* q- K
) @& w6 Y3 Q. C8 F2 y
|