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：tBI华陈数据科技
登陆后打开一个终端输入：tBI华陈数据科技
- cd /tmp
- wget https://project-downloads.drogon.net/wiringpi-latest.deb
- sudo dpkg -i wiringpi-latest.deb
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然后再使用tBI华陈数据科技
检查版本信息，确保版本为：2.52即可。tBI华陈数据科技 
然后再执行：gpio readalltBI华陈数据科技
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
- | | | 3.3v | | | 1 || 2 | | | 5v | | |
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
- | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
-
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这时候就可以继续像往常那样使用GPIO的引脚进行编程了。tBI华陈数据科技
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。tBI华陈数据科技
编写一个C源码：led.ctBI华陈数据科技
调用gcc编译：tBI华陈数据科技
gcc -o led -lwiringPi led.ctBI华陈数据科技
执行：tBI华陈数据科技
./ledtBI华陈数据科技
终端显示：tBI华陈数据科技
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LEDtBI华陈数据科技
tBI华陈数据科技
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