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: h2 P6 G, M0 t# @
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
' E9 s' U7 d% a5 u- k - 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 |( R, e$ V9 ~9 s- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
/ Z2 C3 n+ _" b9 Y3 c - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
. T& g) W5 o! I2 B - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
1 ~& S$ r' z& U, H, B. l% | - | | | 3.3v | | | 1 || 2 | | | 5v | | |7 L6 \2 C+ D) v' n+ v/ P/ l0 B
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |" g; j4 d: A4 C
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
6 s9 L6 Z8 i+ K1 E7 S3 v, I% t - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |6 q1 T1 `# l5 @3 c3 y, N2 C. S
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
4 t- p4 b% k3 N; }" i8 S - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |0 a$ B" E9 Z! O6 T+ Z$ x
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |, q4 h u. L, f9 E$ m
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
$ A9 H: C0 Y2 |& C - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |+ x, x/ r$ n: A! [" T: J
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
- G7 `; k5 y6 j, D2 f4 g - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |' \& y; N- c6 v$ s4 j: @' i
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |* Y7 P' e1 ^2 Q6 i/ c
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
! U6 U+ i x4 r0 W3 {0 c3 Z - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |" l8 t& w" Z+ E" Q! h: y! Y
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
* B) O) ^6 T! Y3 V1 K - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |8 g* X; ^' {) k7 S' F
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
4 m5 q9 V# r5 V4 j# @ h* b, N - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
: X9 {3 N2 Z. O' v/ V$ e - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |* y, D6 V# Y; V. R
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
4 ~7 h( d7 {" k+ b6 h - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+% K B$ ]% Z/ r% g, O5 E
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |: m8 S- z, h6 v% ?
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+) W- N6 a5 N) _- |. ]' k9 \+ |: w
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: . `3 N+ g: X k! Z& y% h" P
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 & g3 j# J* u. p
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