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 /tmp1 D- _7 |+ }! \# F
- wget https://project-downloads.drogon.net/wiringpi-latest.deb- @ `: I1 |6 t7 F
- 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
) r( X/ Q7 T9 S! d: e& v0 `- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+6 {# w4 c& j7 [* s/ I/ B. K
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |" r" r( u8 X" P: Q
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
* p6 K2 r: m/ B4 T2 a& x7 L - | | | 3.3v | | | 1 || 2 | | | 5v | | |
7 _7 u! {2 n2 b+ p& Z. X - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
+ w' t/ @' y( E9 n U% ]1 b$ h% o - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
1 {3 q" h- l& O1 Q& V4 _+ l - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |) i' W! i0 K4 e H* {4 O4 p
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |6 O1 S; i q0 D
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
% U' h" Z. C2 i - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
3 b8 D/ ]8 I8 [ - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
' D) R" x8 D) Q: H& b' U7 Y. Y - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
/ A, \' @( n8 i; f: w% P3 S: @ - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |# S& x8 _9 e( f. P0 G# e8 r" O, {
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
$ q; E$ G3 N; m. E/ X - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
, j J- J8 I% H S - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |4 N& c9 L+ i: j! }$ N! N3 }
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
9 ^1 l2 [, _) n - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |1 J4 s5 Z" E- I8 L$ o' x' n! A
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |8 m; S* C- }+ `% v) l* s) Y
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |- n# p3 T* D( ^: `/ P; o
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |2 j; S) ^% A5 N1 Q8 }
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
5 m/ W7 y/ Z& b* }, T% m& j - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
$ O; k* e& b1 z; y6 a+ d - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
) G2 o8 x& J. |+ j% l& _ - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
2 | _6 e9 S$ R1 y/ i - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
5 s5 |6 {' _: \9 a6 _
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: ! Y/ Z- o+ I+ p
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 * v7 U8 X$ W( V' n; V" ^
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