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
3 z3 N, O, s- e3 M - wget https://project-downloads.drogon.net/wiringpi-latest.deb# o, R" |6 B, d* c6 \: s/ O
- 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 0 G1 j- o1 ~+ K% f2 D6 F
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+ w+ Y9 k* Z2 h* t$ _
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
5 ?( i( |8 v/ i0 c' H/ H - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+3 \8 v1 J) o# W$ L* J' r
- | | | 3.3v | | | 1 || 2 | | | 5v | | |
0 Z6 \5 p; T+ O, l - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |3 f/ \' f0 ?$ B' R& d2 m
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |, q/ l+ q' v9 o
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |# Z/ c1 J& X2 ~) i# n' e
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
! T+ V6 T! N- Y! Q* y0 r - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |4 T% V: J$ K H$ v$ c
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
! o, ]6 g/ w5 u1 ~6 f - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
3 B2 A+ P+ r$ Z# X3 V: Y - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |+ d; W: Q7 B8 X1 |/ O8 }
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |" c+ t! Y# c% |' A9 F
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
& g; {4 K q5 o: c# H$ _ - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |4 r: p( `( U, p1 j
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |/ Z, o) l2 `) ~ q c
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |: z, t! I5 v& y6 p7 A( d
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |2 d& ~7 I9 p0 r0 o4 a5 U5 N- a* _
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |' h* g2 H/ v& j
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
+ A1 K: }* Q/ ~# w, n( j. j - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
2 ^/ n! H! u/ O" e) T @8 L - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
7 }8 A. Q& P8 Y% n7 r f- D8 w3 l/ |; |0 m - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |9 s6 \( T2 o3 b
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
/ `% q- e, m/ e& i) y3 H - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |! @0 |0 C" Q- x% {3 Y% p! A
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+$ r0 R% p, W4 _& Z
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: G8 A% d$ E" e6 K0 X- L
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
/ x* g0 S6 ?1 a" `4 D+ f% _
+ Y# b, h0 o9 j5 Q' I, _ |