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
# p4 T* y7 |; X' M - wget https://project-downloads.drogon.net/wiringpi-latest.deb
' `1 N; S' a* ~, o. a- { - 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
, l; |# o: ^ {1 j0 g/ ]5 R% F- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
7 y8 h& J: z) ]; X - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |; o$ M) _* z8 b6 g v
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+, h8 Y$ D& e. w Z/ z
- | | | 3.3v | | | 1 || 2 | | | 5v | | |
0 w: W& a+ D" ?% E - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |' K# R# [! n. O# u5 {9 l4 P
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |% I- b3 G+ f0 {, P9 J, ~+ F
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
8 C2 P' G4 [ V1 P4 c9 B - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |$ L7 V8 c" W! z" o# z; K
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |7 T o/ d3 d7 y8 p, L4 _
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |) b5 {* A$ U8 o0 m+ f
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |8 p: z6 C c: t' {6 a
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
- ^4 \( ~8 m$ _; ?, R5 v- U - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |9 G' z8 _+ C8 u6 ]
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 | r! e0 t/ a+ T
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
|8 N* g. Q, K9 u - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |$ P1 L" Q! ^; w- A4 O
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 | c v6 b' I5 W% J- O3 S
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
$ l( R& j! m9 y: r9 H$ L - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
" d1 D4 T' T% H+ |+ {7 W - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |( i+ X M7 s& v8 G" {$ l
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
+ S1 L& p7 |* k4 H - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
$ E6 c; K3 Y# X7 }* e; c - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
: k, S% t; I) D! i' T" O5 d - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+# r: W p/ p/ H/ ], K0 x
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
4 N# ^% \0 J* s" h' J% z' A* C - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
0 k% ?3 P5 S; J
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% V# h" g4 Q: T
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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