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
5 N7 C; J" `7 E! ^& i5 X' k/ a8 ]6 R - wget https://project-downloads.drogon.net/wiringpi-latest.deb* X' h5 l( `4 J
- 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
* w6 w5 X1 y/ _9 ]1 B- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+0 R. r. H4 T, R- F: s& _
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |) ^/ Y$ o) s9 Y7 L6 }
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
; z6 O4 Z) [0 q7 `' M* g2 V - | | | 3.3v | | | 1 || 2 | | | 5v | | |
4 T- t3 T5 I( X5 }8 s V - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |1 ^1 ~1 a& |5 R# Y8 Y
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
0 z" z1 q: A' ~. t - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |, i; ?7 r" A0 F6 l& r. d6 m4 D
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |! t; e# S8 y5 n( z( Q$ D/ s. M
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |5 |' |: f7 T: s3 Z; f
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
) f* _1 F5 G! l - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
B4 V2 }7 P+ O7 ` - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |9 T/ d3 ^: b# [8 H- D) s w
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |* z. n" n( w6 i! g
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
5 j2 \% ]) j/ v - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
; K+ D' b! _# G( Y - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |3 Q( `; R' ?' A4 F% h9 l, x
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
1 E9 x5 z1 F& A+ D: O2 b- g - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
+ a; f' I9 S% x6 h3 D' Z - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
; u! d" D/ I% O+ X& w' h& B - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |! O7 _3 ~9 s9 R+ g9 Z7 `
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
( v/ T3 Y' Q; p+ s% V; K - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |, y4 I+ m' R8 F
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
+ u8 ^; S' ~$ t, e - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
0 y$ S8 U3 |$ G6 ]1 F- y - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
7 e2 m3 D7 V8 Y P: N - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+, b. S! N- Z% k6 |$ x+ z
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: ! n! j- m0 u( V/ D
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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