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
4 e# z+ [& E2 n$ i/ c - wget https://project-downloads.drogon.net/wiringpi-latest.deb
3 R) c4 w6 [1 l - 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 . D3 g6 {$ S _( ^6 D" y
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+( b, x% i& D/ M6 d7 i
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
& i4 S. F8 Q7 H5 h% T$ ` - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+& [3 m- i% o& N
- | | | 3.3v | | | 1 || 2 | | | 5v | | |
( k0 i/ p" i) I - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |8 S5 ?' k8 }8 \4 ?$ G% o k
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
2 j2 n2 s% R' @/ V - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
, _& R- g' t' Z# } - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |6 O* i; x1 J9 R& _: M
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
- C+ N; A- T4 R2 ?7 Y6 Y - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
. T. N, ~5 l" D' V* r# v0 r - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
; b+ q) f5 K# i2 b9 e" K: w, r) \2 E - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |" ?& p4 Z' g8 J I4 @
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
1 t. w. }- s8 W/ q( v% x' B - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |0 ~# R$ Z9 n! O; K; e, K
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
* x/ M, a. J0 d. p. O/ m2 M - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
6 |, Z" k/ _6 K+ _ } - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
, C8 H( D T" v! \ - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
) r; w0 j- i4 w/ {7 A8 Z - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |" n# o2 |0 r# |) T
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
, C7 R0 S" W: W, C/ L - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
" B' l9 C% m: p4 E7 v - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
: ^1 K! W4 u, a! |$ k& w3 Q - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
7 e7 T: }$ L( c% O$ C9 r - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
0 D$ |* v* B7 c- W5 a4 q - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
2 N9 ~" ]- P3 p: P! R& p - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
2 l2 }% e1 c: `4 A( R
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:
8 m+ {7 p; e& Q/ g9 `1 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 : l# X( M r. D* z' y/ W
7 H5 T& [' B9 w1 v+ m |