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 F9 a% L: K* w: q
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
6 e |0 p$ A; ^: n; d" U - 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 & n g8 j7 F" |
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
0 m }1 y+ s5 f: a0 H - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
* R- p0 Q- I& y - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+) u; f7 K' x& ~$ H/ l/ h; Z% w
- | | | 3.3v | | | 1 || 2 | | | 5v | | |! t0 [' H7 v5 S/ s% v
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
$ l* I4 I* K, z( U - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |" T! ~; K; P6 S: G" [' F* R
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
$ M- E* y8 B7 m$ |% M - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
. H N; `/ N+ T& L - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
3 G L, V' F5 t9 e - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
% \) R; `9 k9 G - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
$ a3 Q* F9 p/ t+ F/ R& Y- v" S - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
9 J0 r8 O4 g" X( C7 t) t - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
: ] \& s. p8 r) x5 s* w a - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |3 I3 N! b& L* P/ f; Z% U
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
; H5 {: {* e- H; I9 e2 o( X - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |9 _5 w, n* \7 L8 _
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
6 w( I# B, B3 D* S7 u: M+ ? - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |( D, c7 z K+ ?1 d7 c, n' I7 L
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
8 s6 E: ]- `5 J9 x+ p - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |$ e2 G- `3 k4 W) Z- w
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |6 Q: I. X% ^( x9 g$ {. O
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
# u9 C6 F: f0 O0 u& P - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |6 |7 k, C7 D) F2 G* [% c
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
/ |1 L: k' W/ _* ^8 `5 v7 L0 X( b. e - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
7 S3 D& q4 A6 H0 p: n2 ^ - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
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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 c B3 T+ ?( E$ W7 |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 % R; h; T5 |4 w/ [7 U% V! z- K
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