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( n# l" s7 g& t" n d. u* j! p
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
7 b! b7 t4 a0 P7 s4 x - 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 ' q! Q3 U4 c Y5 @( U' }
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+9 s7 c5 Y/ v; n# ~. |' h
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |1 M, w* a) x* J x5 \/ p5 |* x4 D5 X( T
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+4 e) @( s4 { H
- | | | 3.3v | | | 1 || 2 | | | 5v | | |
* F4 Q: n+ @. p# |' |3 [/ Q0 M - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
: c5 t" t q* z) D- T7 D) E0 n - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |3 o3 b6 T+ ?+ l9 K, S
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |% }. C( q' x& V X0 o
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |4 ?! B% k! \$ L" }- `! O a
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |1 R0 z% R& z4 @; n L
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |- [ E5 E) h/ ]$ x8 A
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
7 E+ L8 W1 h; i B+ W& g2 @+ T - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
% j( E6 i6 S$ l) d' f7 d4 K7 q - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |* y& S0 A# V% @: B* R* ~
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |( P, x' L' I9 s6 J7 Q. E
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |( z: i) `2 Y+ {; ~) T g
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |0 ~% G6 F+ |( X. V2 C( h2 D
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
* o% u: z3 z( E+ P% T - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
, r: S8 ^( |$ O0 P/ m5 k - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
+ w& W( j9 c6 v& W& {7 \ - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |7 B! q/ U- ]. a( g& z
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |6 L, o9 o% N7 N9 @ G! `; B
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
9 p/ o9 r- i @& P2 D. q - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |4 X2 N* a; I5 Q% S" S
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
: H9 W1 o# |9 A2 k4 Y U - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
( r4 w. o1 J5 G" P/ a8 b; V* y% A - +-----+-----+---------+------+---+---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:
1 k6 V! {$ Y$ { [" U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 8 t$ q1 E& q3 s5 L) y$ V7 w" Q
: g" x6 g1 P* S+ }% e" g
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