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 /tmp6 [8 Q1 O" r5 `3 ?
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
* E. e) |& z z1 h+ [: J- K/ v - 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
8 d* L& a: Z" D- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+0 m' @( }; t& n! z" n' \
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
4 y& t3 S! a2 T# w: V6 v# B - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
# T% k% c9 D0 k7 @9 u - | | | 3.3v | | | 1 || 2 | | | 5v | | | {3 a: u8 e. u# E3 c* ]: q+ ^
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
. A. D" X5 w7 F - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |: _$ r# L2 _7 @$ m0 L4 y
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |0 q% X% R. \. Y% m+ \" C3 b
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |! l% d) n, J3 [, y* u, b' P
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |7 [) b4 K/ T* r" w
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |% @* |0 o u4 ]" O3 b- r( L/ b
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
1 q% l! R( y- `! H - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |& G* p- U! L) B2 U3 x; S2 [
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |* ?% N" N# A+ r* s3 l: R5 j6 m
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
( z0 O. P7 g& v - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
! f1 N2 k; o7 ~2 Q* n0 f$ V - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |3 z/ T9 j0 z; B9 Z9 }7 A
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |4 \+ r- G2 Q* l$ x& n5 B
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |1 J+ c/ s2 C" y& D5 p5 l) }
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
5 N+ A3 z6 a: G8 E* D: T, m - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
% b9 y9 L8 g. C1 O p8 _, y0 ~- c - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 | t' h1 {5 m" h3 o9 j/ p. @
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
2 W* ^2 C; b$ a - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
( k9 }8 c, s+ R& w/ n$ J - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
, E) n9 B: |/ {3 f - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
( S( K& R9 o3 z% a% x- a" v* z - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
$ s( I+ t; i" E V# J( m+ K& W
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:
1 R" D( G# U3 F2 Y2 B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 9 S; N% p5 N2 x/ M9 W! d( m& \
+ S1 C- _9 Q% [& U3 u. X* N |