X code，C ++与Arduino的串口 [英] xcode, c++ serial port with arduino

问题描述

我正在做一个非常简单的C ++程序，它发送一个角度通过串口的Arduino然后Arduino的那个角度适用于伺服电机。我知道，Unix的看到串口设备，如一个文件，其实这是C ++ code：

i’m making a very simple c++ program which send an angle to arduino through a serial port and then arduino apply that angle to a servo-motor. I know that Unix see serial ports device like a file, in fact this is the c++ code:

#include <iostream>
#include <unistd.h>

using namespace std;

int main()
{
    int angole;
    FILE * arduino;

    do
    {
        arduino = fopen("/dev/tty.usbmodem3a21","w");

        cout<<"\n\give me the angle\n\n";
        cin>>angole;

        fprintf(arduino,"%d",angole);
        sleep(1);

    }while(angole>=0 && angole<=179);

}

这是Arduino的的：

and this is arduino’s:

#include <Servo.h>

Servo servo;
const int pinServo = 2;
int angle;

void setup()
{
    Serial.begin(9600);
    servo.attach(pinServo);
    servo.write(0);

}

void loop()
{
    if(Serial.available()>0)
    {  
       angle = Serial.read();
      servo.write(angle);
    }
}

我也查了Arduino的应用程序，在工具>串行端口> /div/tty.usbmodem3a21，这是正确的端口。

i also checked in the arduino app, in tools>serial port>/div/tty.usbmodem3a21 that it was the right port.

的问题是，程序停止在阿尔杜伊诺=的fopen（的/ dev / tty.usbmodem3a21，W）;因为它甚至不写邮件给我的角度。

The problem is that the program stops at arduino = fopen("/dev/tty.usbmodem3a21","w"); because it doesn’t even write the message "give me the angle".

例如，当我写在打开的功能错误的端口，它写入消息。

for instance , when i write the wrong port in the open function , it writes the message.

推荐答案

事实上，一切Linux是一个文件的，而不是字面 - >本质是哪种类型的文件 - 中你的情况，你把港口作为纯香草文件（即类似txt文件），而你需要把它当作一个设备文件，所以没有的fopen 但是：

Indeed, "everything in Linux is a file", but not literally --> the essence is which type of file - in your case you treat the port as plain vanilla file (i.e. something like txt file) while you need treating it as a device file, so no fopen but :

fd = open("/dev/tty.usbmodem3a21", O_RDWR | O_NOCTTY | O_NDELAY);

借助以下是有关的文件接口一个很好的参考串口
这 之一甚至Arduino的导向

The following is a good reference about the file interface of serial ports And this one is even arduino oriented

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