玩转树莓派（五）使用C语言通过wiringPi库控制GPIO

ゝ一世哀愁。 2022-10-25 14:02 350阅读 0赞

# 玩转树莓派（五）使用C语言 通过wiringPi库控制GPIO #

### 目录 ###

*  玩转树莓派（五）使用C语言 通过wiringPi库控制GPIO
 *   *  一、创建环境
     *  二、编写代码
     *  三、编译运行
     *  四、查看效果
     *  五、wiringPi库简单介绍
     *  六、漂亮的Ending

## 一、创建环境 ##

*  新建CWorkSpace文件夹
 *  新建gpio\_out.c文件

pi@raspberrypi:~ $ mkdir CWorkSpace
    pi@raspberrypi:~ $ cd CWorkSpace/
    pi@raspberrypi:~/CWorkSpace $ vim gpio_out.c

## 二、编写代码 ##

*  编辑gpio\_out.c

#include <wiringPi.h>
    #include <stdio.h>
    
    #define PIN 1
    
    int main(void)
    { 
    	int i=0;
    	wiringPiSetup();
    	pinMode (PIN, OUTPUT);
    	for(i=0;i<10;i++)
    	{ 
    		printf("gpio out: %d\r\n", i);
    		digitalWrite(PIN, i%2); 
    		delay(3000);
    	}
    	printf("gpio out end\r\n");
    	return 0;
    }

## 三、编译运行 ##

*  编译，编译时要连接wiringPi的库
 *  运行

pi@raspberrypi:~/CWorkSpace $ gcc -o gpio_out gpio_out.c -lwiringPi
    pi@raspberrypi:~/CWorkSpace $ ./gpio_out 
    gpio out: 0
    gpio out: 1
    gpio out: 2
    gpio out: 3
    gpio out: 4
    gpio out: 5
    gpio out: 6
    gpio out: 7
    gpio out: 8
    gpio out: 9
    gpio out end

## 四、查看效果 ##

用万用表量下编号12的GPIO.1的引脚，可以发现其间隔3s的高低电平变换了10次。  
![在这里插入图片描述][20210131201924245.png]

*  手边如果一时半会找不到树莓派的GPIO引脚图
 *  可以通过gpio readall查看

pi@raspberrypi:~/PythonWorkSpace $ gpio readall
     +-----+-----+---------+------+---+---Pi 3B--+---+------+---------+-----+-----+
     | 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  | 0 | IN   | TxD     | 15  | 14  |
     |     |     |      0v |      |   |  9 || 10 | 1 | IN   | RxD     | 16  | 15  |
     |  17 |   0 | GPIO. 0 |   IN | 0 | 11 || 12 | 1 | OUT  | 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 |   IN | 0 | 23 || 24 | 1 | IN   | CE0     | 10  | 8   |
     |     |     |      0v |      |   | 25 || 26 | 1 | IN   | CE1     | 11  | 7   |
     |   0 |  30 |   SDA.0 |   IN | 1 | 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 3B--+---+------+---------+-----+-----+

## 五、wiringPi库简单介绍 ##

<table> 
 <thead> 
  <tr> 
   <th>函数</th> 
   <th align="left">int wiringPiSetup (void)</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>说明</td> 
   <td align="left">设置wiringPi的引脚编号系统</td> 
  </tr> 
  <tr> 
   <td>返回</td> 
   <td align="left">-1：失败；其他：正常</td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <thead> 
  <tr> 
   <th>函数</th> 
   <th align="left">int wiringPiSetupGpio (void)</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>说明</td> 
   <td align="left">设置BCM 的引脚编号系统</td> 
  </tr> 
  <tr> 
   <td>返回</td> 
   <td align="left">-1：失败；其他：正常</td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <thead> 
  <tr> 
   <th>函数</th> 
   <th align="left">void pinMode (int pin, int mode)</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>说明</td> 
   <td align="left">设置引脚的IO模式</td> 
  </tr> 
  <tr> 
   <td>输入</td> 
   <td align="left">pin：引脚编号</td> 
  </tr> 
  <tr> 
   <td>——</td> 
   <td align="left">mode：INPUT、OUTPUT、PWM_OUTPUT((仅wiringPi 1号引脚支持))，GPIO_CLOCK(仅wiringPi 7号引脚支持)</td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <thead> 
  <tr> 
   <th>函数</th> 
   <th align="left">void digitalWrite (int pin, int value)</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>说明</td> 
   <td align="left">设置引脚的输出电平</td> 
  </tr> 
  <tr> 
   <td>输入</td> 
   <td align="left">pin：引脚编号</td> 
  </tr> 
  <tr> 
   <td>——</td> 
   <td align="left">value：电平状态，HIGH：高电平；LOW：低电平</td> 
  </tr> 
 </tbody> 
</table>

## 六、漂亮的Ending ##

觉得好，就打个赏呗  
觉得好，就一键三连呗  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2thbmd3ZWlqaWFu_size_16_color_FFFFFF_t_70_pic_center]

[20210131201924245.png]: /images/20221024/6e8eeee500b7463a85e7d91d0b8c942f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2thbmd3ZWlqaWFu_size_16_color_FFFFFF_t_70_pic_center]: /images/20221024/ea6de100c85a436386438afd9d004001.png