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 /tmp9 R- j& b/ R$ x3 i0 @7 T
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
0 b& m& F% L1 _- 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 2 X* M/ a S6 \
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+5 k8 a7 q* o' N# ]
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
; p/ V- o/ O- S - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
/ C2 j5 |+ k7 n - | | | 3.3v | | | 1 || 2 | | | 5v | | |- i; x: ^# ?, S- }. h+ F
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
( ~) O1 v4 x' W( Q - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |6 m9 a7 o( [' X6 _
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
" @, c, M9 y5 C8 O1 A - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
! e x. Q0 x& }4 N# f - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |1 h* L7 e% {8 P8 O
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |0 a/ f$ |7 N$ h( P
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |5 @2 _* r, f/ s& ?& `0 u0 R
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
+ }0 p% y: K. s( @2 ^ - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |4 A7 |+ k: l+ X2 {7 m( T' r
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |( I+ |1 z/ z, I
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
# g5 ?" E- O) c - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
$ b( d$ _: e& \" E - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |1 {9 h0 |/ B/ ^) D1 q
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
2 S( x3 r& Z7 [3 e: d b; y( o - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |9 t' b& a6 @' ^1 {# \
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |/ k& G; m7 O* Z( o) \+ \# ?
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
0 ?4 j5 ?! G* v- | - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
) w( k ]- u' {6 J - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
2 L. v3 F( e+ U$ `0 T - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+3 x6 O; A8 a% u
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |# M- h9 A, K6 r! X5 \
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+3 @) ~' S2 F( t& o) _4 u
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: 4 w( A1 H1 l' H' 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
2 c5 n* Y6 I8 |4 y* \2 { {, V0 s' p5 o$ S0 S( H! T
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