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 Z e& y5 D7 q) ~
- wget https://project-downloads.drogon.net/wiringpi-latest.deb n( J- j- O% 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 " U8 P. j8 z. v3 ]. K
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+% ^9 f: i& s* i/ l( f$ g# p9 Y
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |+ w/ ]& y4 }3 u7 v6 A. d$ K
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
- w: ?5 y/ g- k/ Y# I - | | | 3.3v | | | 1 || 2 | | | 5v | | |
: K, ~8 g0 k: v - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |$ s7 e9 u3 ^- o, u7 M
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
; w8 x+ B& O) h$ c h3 ^0 F - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
% q& I4 t) e9 }1 o - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |! k5 b1 T- i% s) \: C6 }
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
2 d5 C$ F( N$ q' i9 N8 b - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
7 c0 O3 T4 r P/ l/ z. p - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |# X: G3 W0 w8 Y# D, ~4 g' o
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
5 J. Z: s8 p& p8 B* M% O @ - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
% ^, X/ v s6 `; W6 h# N1 m - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
) r/ Z3 k9 y5 u% Z, b) e& p - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
" P) Q9 R: ^& h! ]2 J; c - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
6 y/ V& n. x5 h' L/ C$ x - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |2 j9 p7 V. W4 k! X% a
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |" V7 c7 G7 i; X! D
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
+ y7 w# B2 A1 W - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |6 e% u; u4 y: i1 N! Y3 T
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
9 O2 Q2 G" D6 V( }: t6 f - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
6 G( L3 [4 c& x8 Q$ D# m$ Q: I - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |% ^% B, ^ K: J. W- [) m
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
" o8 Q; x O3 k, \2 {3 z+ b! S - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
( d' g$ Q- x- `+ V0 o) R: X - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+1 Q8 J( e0 G% ]* G( {
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:
s+ \, C3 Z, U. v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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