xcode, c++ 串口与arduino [英] xcode, c++ serial port with arduino

问题描述

我正在制作一个非常简单的 C++ 程序，它通过串行端口向 arduino 发送一个角度，然后 arduino 将该角度应用于伺服电机.我知道Unix把串口设备看成一个文件，其实这是c++代码:

#include #include 使用命名空间标准；int main(){国际角;文件 * arduino;做{arduino = fopen("/dev/tty.usbmodem3a21","w");cout<<"\n\给我角度\n\n";cin>>angole;fprintf(arduino,"%d",angole);睡眠(1)；}while(angole>=0 &&angole<=179);}

这是 arduino 的:

#include 伺服伺服；const int pinServo = 2;内角；无效设置(){Serial.begin(9600);伺服.attach(pinServo);伺服.写(0)；}空循环(){if(Serial.available()>0){角度 = Serial.read();伺服.写(角度)；}}

我还检查了 arduino 应用程序，在工具>串行端口>/div/tty.usbmodem3a21 中，它是正确的端口.

问题是程序停在arduino = fopen("/dev/tty.usbmodem3a21","w");因为它甚至没有写给我角度"的信息.

例如，当我在 open 函数中写入错误的端口时，它会写入消息.

解决方案

确实，Linux 中的一切都是文件"，但不是字面意思 --> 本质是哪种类型的文件 - 在在您的情况下，您将端口视为普通的 vanilla 文件(即类似 txt 文件的文件)，而您需要将其视为 device 文件，因此没有 fopen 而是:

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

以下是一个很好的参考串口而这个 one 甚至是面向 arduino 的 >

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);

}

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);
    }
}

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

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".

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

解决方案

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);

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

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