|
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 /tmp7 G* x) `) m8 k/ K
- wget https://project-downloads.drogon.net/wiringpi-latest.deb% f3 I5 V, L2 n* m. o1 x0 \: Y
- 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 / ?4 l4 R- Y; r* U. k# a' B
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
. v$ ]9 f; p: H& W4 D - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
! R5 u- ]3 m2 Q/ F7 j& J - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+# w% l% j% D% U% A' L& p9 a
- | | | 3.3v | | | 1 || 2 | | | 5v | | |* {+ e1 s3 s4 ?2 w$ H( K+ T
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
k- E" f% g# M7 J" ]% b - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |5 V! g- T$ j, M7 Q
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
N9 }5 U7 U5 j" p8 W; i - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
- @/ a7 A. n/ d - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
3 [2 f" g0 p1 h' Z, @/ s5 h* L - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
1 J1 O y, q. m - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
3 Q- @9 l8 s2 [2 e - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
: I# K7 \" s5 ]! l7 ~% D/ H, k - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
8 d4 f$ [0 M i. ` - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
2 F0 Z5 ?) u, W' f4 E# x' v# @ - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |: \# _' S$ v# _# k+ D
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |( a1 y! ^+ D$ u$ F8 z0 H" ^
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
; f; ^$ J6 F+ N( Q' M - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |2 U- R4 h: o ]; y8 I
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |7 j# E6 F, O; y% }
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
" q2 c: k8 L; X( {/ b& x( q9 _ - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
+ P7 \5 C% b1 b2 ` - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
& Y3 i/ [* m/ b# w; R- D: v - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
- T. i/ ~ d* {& d) R, t - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
2 ]1 D5 z9 v H, x - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
" r) I5 o, S% C- G - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
+ c. A% g; G' r) T
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:
: O- c$ V& v& f( z' 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
% Z$ F# \6 X, H2 ~% x
( v) j) z" U( ^ ] |