树莓派4B 更新wiringPi库到2.52的方法
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 /tmpwget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb然后再使用gpio -v检查版本信息,确保版本为:2.52即可。http://www.52pi.net/wp-content/uploads/2019/07/image-2.png然后再执行:gpio readall
+-----+-----+---------+------+---+---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+--+---+------+---------+-----+-----+
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.chttp://www.52pi.net/wp-content/uploads/2019/07/image-4.png调用gcc编译:gcc -o led -lwiringPi led.c执行:./led终端显示:
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
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