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
/ ]9 r8 C' d, [% C) H - wget https://project-downloads.drogon.net/wiringpi-latest.deb( l+ D0 I$ e7 W% v
- 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 9 Q# ~* w: F2 ~+ }3 [. I
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+ W; }. s' _& R. z, X* M2 M( P$ J
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
! T8 \4 O' r) b5 _8 E% d9 M! f - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
% c! ^7 S# B1 `# A( G% w3 [4 E - | | | 3.3v | | | 1 || 2 | | | 5v | | |
$ R, {# X7 G; h" G - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
/ Q. `! o8 F$ J - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
7 @1 {$ }8 T, O+ h* J8 I% F' _! u - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |% L. I) K# R% N% X. Z7 s2 P* v/ Q$ F
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |. z* a2 n% O S
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
3 Y0 ^3 R: Z3 [ - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |; w& C1 h' M7 m* D* A$ B% g& m
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
) M4 z& a. s, B+ o5 F. ~ - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |. M( n% S: \* A- V
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |9 W2 }9 s& h; k% Z: F
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |$ R$ b2 \/ c: K7 z
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |( e' g+ h! e9 X Q
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |4 z2 g* K3 U* l1 v
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
( D" ]" @; J* K i5 R - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |. N) W$ f+ s& i0 ^
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
. G$ b. C: v* i) |+ o$ I - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |7 M$ S2 J1 c9 L H* A
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
# }% D& h% v$ T7 } - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
7 o3 U1 r* }/ X+ f9 n - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |: o6 I) L$ D$ R( d' [ I9 K4 ]
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+% I" \4 X6 e3 i: F8 Y: J
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |2 U* D8 B0 I5 T$ d) s7 ]& G
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
$ v! Y' Q# w& m
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: E1 ]2 i" J8 l% R/ I& q
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 & @/ w' i1 v6 B
_! T2 R/ ~( g9 ?
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