C语言来控制树莓派blink

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首先我们安装wiringPi 

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sudo apt-get install git-core
git clone git://git.drogon.net/wiringPi
cd wiringPi
./build

这样我们就安装成功了,如果失败请更新系统: 

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sudo apt-get update
sudo apt-get upgrade

然后我们可以开始使用C语言写一个简单的闪烁程序了:

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nano blink.c

以下源码来自wiringPi的examples/blink.c: 

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#include <stdio.h>
#include <wiringPi.h>

// LED Pin - wiringPi pin 0 is BCM_GPIO 17.

#define LED     0

int main (void)
{
  printf ("Raspberry Pi blink\n") ;

  wiringPiSetup () ;
  pinMode (LED, OUTPUT) ;

  for (;;)
  {
    digitalWrite (LED, HIGH) ;  // On
    delay (500) ;               // mS
    digitalWrite (LED, LOW) ;   // Off
    delay (500) ;
  }
  return 0 ;
}


按Ctrl+X,然后输入Y,回车保存. 然后,我们利用gcc来编译刚才的源码,运行: 

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gcc blink.c -o blink -lwiringPi
sudo ./blink

这里记得,控制IO的时候需要sudo,不然会提示: 
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wiringPiSetup: Must be root. (Did you forget sudo?)

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+-----+-----+---------+------+---+-Model B2-+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
 |   2 |   8 |   SDA.1 | ALT0 | 1 |  3 || 4  |   |      | 5V      |     |     |
 |   3 |   9 |   SCL.1 | ALT0 | 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 |   IN | 0 | 23 || 24 | 0 | IN   | CE0     | 10  | 8   |
 |     |     |      0v |      |   | 25 || 26 | 0 | IN   | CE1     | 11  | 7   |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |  28 |  17 | GPIO.17 | ALT2 | 0 | 51 || 52 | 0 | ALT2 | GPIO.18 | 18  | 29  |
 |  30 |  19 | GPIO.19 | ALT2 | 0 | 53 || 54 | 0 | ALT2 | GPIO.20 | 20  | 31  |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+-Model B2-+---+------+---------+-----+-----+