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 /tmp0 f g; r; p$ m- R, I# l4 z
- wget https://project-downloads.drogon.net/wiringpi-latest.deb3 E6 I5 z+ i+ b- t- [
- 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
, p8 i! H- N( x$ Q- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
9 M0 C# s6 }+ p9 m" u9 I - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |% k7 N- G( r$ D" ~0 \6 p k
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
1 Q$ S B2 a$ R - | | | 3.3v | | | 1 || 2 | | | 5v | | |& m$ O9 k& V% U* |
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
0 g& x* ]- G) {6 q2 E4 u1 W4 {. U - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
; B, A& e) G4 M6 E- P! e9 z6 V - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
9 v1 o' T- l2 b3 s! c: Y - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |# L J6 j: h* e/ x0 r* ~
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |6 M& c$ x5 P6 {5 w# Z. H7 u5 e
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
- I. k" z# ^8 E* i9 N9 {" A" d4 r - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
' a1 B8 o; w( S' ?1 B) g - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
, G5 P" T1 e ]4 y2 e) `% K - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |" ]1 i, y: Q2 ~
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
) D& I4 U8 p# F0 h- R - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |7 Z# X* i% y* O- V6 ?
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
- ?! o6 ^+ B' M8 S" n. v - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
3 w8 f9 y- h2 U0 k" { - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
& i5 m4 W- b( u) t, z& ]5 D# L+ e - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |, ]4 k5 h( v1 j& N4 j
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |( i$ Y9 u# m4 h' ~; q/ t
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
4 V% Z# B, |! [/ @3 e/ v; n8 a - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
4 |- O6 c, N! \% T, M- h+ Q+ G - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
9 h, k8 X8 p, W# m+ o4 V - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
p$ `* l+ r3 m- o! {8 i - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
% \' x9 H6 f1 G9 U+ U% z - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
# b% w. V8 F. a
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:
; D7 n' ^; o$ V+ i+ I1 N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 5 O6 Z9 {; j- u' V) ?1 N
* |5 c/ C7 _6 K7 I' H1 l3 o7 K |