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最初，我使用AutoHotkey与 Arduino 进行通信，但我发现在没有向 Arduino 发送任何内容的几个小时后（Arduino 每十秒发送一次“心跳”），连接将冻结或失败。

现在我正在尝试通过带有RS-232 库的 C++ 程序的串行连接来控制 Arduino 。

但我遇到了同样的问题。程序每 20 秒 ping 一次 Arduino，然后 Arduino 应该报告一小串信息。几个小时后，连接断开，我的 C++ 程序只是坐在那里 ping 没有响应。Arduino有一个看门狗，当连接不存在时，我可以验证它是否仍在工作，所以我相信我的问题在于串行的某种固有超时......除了正在积极使用连接......

我将不胜感激任何帮助弄清楚我需要做什么才能保持串行连接处于活动状态，计算机必须能够 24/7 向 Arduino 发送数据。

我正在编译Code::Blocks，并在 Windows 7 上运行该程序。

我对 C++ 或 C 不是很熟悉，所以如果你发现我在程序中做的其他愚蠢的事情，请告诉我。

主文件

/**************************************************

  File: main.cpp
  Purpose: Simple demo that receives characters from
           the serial port and print them on the
           screen.

**************************************************/

#include <stdlib.h>
#include <iostream>

#ifdef _WIN32
    #include <Windows.h>
#else
    #include <unistd.h>
#endif

#include "rs232.h"

using namespace std;

int main()
{
    int debug = 0;
    int i = 0, n,
    cport_nr = 5,        /* /dev/ttyS5 (COM6 on Windows) */
    bdrate = 9600;       /* 9600 baud */

    unsigned char buf[4096];

    if(OpenComport(cport_nr, bdrate))
    {
        cout << "Can not open comport\n";
        return(0);
    }

    while(1)
    {
        if (debug)
        {
            printf("Entering While(1) loop. \n");
        }

        n = PollComport(cport_nr, buf, 4095);

        if(n > 0)
        {
            buf[n] = 0;   /* always put a "null" at the end of a string! */

            /* for(i=0; i < n; i++)
            {
                if(buf[i] < 32)  // replace unreadable control-codes by dots
                {
                  buf[i] = '.';
                }
            } */

            //printf("\n\n\nreceived %i bytes: %s\n\n", n, (char *)buf);
            cout << endl << endl << endl << (char *)buf;
        }

        if (SendByte(cport_nr, 83))
        {
            printf("\n\nSending data didn't work. \n\n");
        }
        else
        {
            cout << "\nSent [S]\n";
        }

        i = 0;

        #ifdef _WIN32
            Sleep(10000);  /* It's ugly to use a sleeptimer, in a real program, change
                              the while-loop into a (interrupt) timerroutine. */
        #else
            usleep(10000000);  /* Sleep for 100 milliSeconds */
        #endif
    }
    return(0);
}

Arduino文件

//
// SuiteLock v.2.1a
// By: Chris Bero (bigbero@gmail.com)
// Last Updated: 11.4.2012
//

#include <Servo.h>
#include <avr/wdt.h>

// Pin Constants:
const int servoPin = 9;
const int doorbtn = 3;

// Not sure if I'm still going to use these...
const int ledGND = 4;
const int ledVCC = 5;
const int servDelay = 600; // The delay allowing for the servo to complete an action.

//Variables:
int doorState = 0;  // The value returned by the door button (0 or 1).
int servState = 90;  // The position of the servo in degrees (0 through 180).
unsigned long prevMillis = 0;
unsigned long progCycles = 0;
int serialByte = 0;
int lastSerial = 0;
int smallBlink = 0;
bool dostatus = false; // Determine whether to send sys status.
Servo serv;

// Set up the environment.
void setup()
{
    wdt_enable(WDTO_4S);
    pinMode(doorbtn, INPUT);
    pinMode(ledGND, OUTPUT);
    pinMode(ledVCC, OUTPUT);
    pinMode(servoPin, OUTPUT);
    digitalWrite(ledGND, LOW);
    serv.attach(servoPin);
    Serial.begin(9600);
    prevMillis = millis();
}

////////////////////////////////////////////////
// Statuser - Sends system status to Serial
/////////////////////////////////////////////
int statuser ()
{
    wdt_reset();
    Serial.println("[Start]"); //Start Of Transmission
    delay(15);
    unsigned long currentMillis = millis();
    refresh();
    Serial.print("\tTime Alive: ");
    int hr = ((currentMillis/1000)/3600);
    int mn = (((currentMillis/1000)-(hr*3600))/60);
    int sc = ((currentMillis/1000)-(hr*3600)-(mn*60));
    Serial.print(hr);
    Serial.print(":");
    Serial.print(mn);
    Serial.print(":");
    Serial.println(sc);
    Serial.print("\tNum of Program Cycles: ");
    Serial.println(progCycles);
    Serial.print("\tAvg Cycles per Second: ");
    int cps = (progCycles/(currentMillis/1000));
    Serial.println(cps);
    Serial.print("\tDoorState: ");
    Serial.println(doorState);
    Serial.print("\tServo Position: ");
    Serial.println(servState);
    Serial.print("\tLast Serial Byte: ");
    Serial.println(lastSerial);
    delay(15);
    Serial.println("[End]"); //End Of Transmission
    return(0);
}

////////////////////////
// Lock the door.
/////////////////////
int locker()
{
    wdt_reset();

    // Check the button states.
    refresh();

    // Make sure the door is closed.
    do
    {
        wdt_reset();
        delay(500);
        refresh();
    } while(doorState == LOW);

    // Turn on the locking LED during the servo movement.
    digitalWrite(ledVCC, HIGH);

    wdt_reset();

    // Tell the servo to turn to 20 degrees.
    serv.write(20);

    // Give the servo time to complete the turn.
    delay(servDelay);

    wdt_reset();

    // Turn the servo opp direction to reset.
    serv.write(90);

    // Wait for the servo to reach it's reset point.
    delay(servDelay);

    // Turn off the cool little LED.
    digitalWrite(ledVCC, LOW);

    // Call parents for 11pm checkup and tell them everything's A-OK.
    return(0);
}

/////////////////////////
// Unlock the door.
//////////////////////
int unlocker ()
{
    wdt_reset();

    // Check the pin states.
    refresh();

    // Turn on the status LED.
    digitalWrite(ledVCC, HIGH);

    wdt_reset();

    // Turn servo to 170 degrees to unlock the door.
    serv.write(170);

    // Wait for servo motion to complete.
    delay(servDelay);

    wdt_reset();

    // Reset the servo to 90 degrees.
    serv.write(90);

    // Wait for reset motion to complete.
    delay(servDelay);

    // Turn off LED.
    digitalWrite(ledVCC, LOW);

    return(0);
}

///////////////////////////////
// Refresh button states.
/////////////////////////////
void refresh ()
{
    wdt_reset();
    doorState = digitalRead(doorbtn);
    servState = serv.read();
}

///////////////////////
// Main function.
////////////////////
void loop()
{
    wdt_reset();

    // Blink the LED every so many turn overs of the function.
    if (smallBlink == 5)
    {
        smallBlink = 0;
        digitalWrite(ledVCC, HIGH);
        delay(300);
        digitalWrite(ledVCC, LOW);
    }

    // Status.
    if(dostatus == true)
    {
        unsigned long currentMillis = millis();
        if ((currentMillis - prevMillis) > 4000)
        {
            prevMillis = currentMillis;
            statuser();
        }
    }

    // Refresh button states.
    refresh();

    // Is the door closed and not locked? *Gasp*
    if ((doorState == LOW))
    {
        // Fix it.
        while (doorState == LOW)
        {
            wdt_reset();
            delay(500);
            refresh();
        }
        locker();
    }

    // Check for available communications.
    if (Serial.available() > 0)
    {
        // Reset the serialByte, done for debugging.
        serialByte = 0;
        wdt_reset();
        // Read the serialByte.
        serialByte = Serial.read();
        lastSerial = serialByte;
    }

    // Act on the byte data.
    if (serialByte == 'U')
    {
        // Let someone in.
        unlocker();
        // Wait for the door to change states.
        delay(1000);
    }
    if (serialByte == 'L')
    {
        locker();
        delay(1000);
    }
    if (serialByte == 'S')
    {
        statuser();
        delay(200);
    }

    // Clean serialByte for debugging.
    serialByte = 0;

    // Count through program cycles.
    progCycles++;
    smallBlink++;
}

我调整了 C++ 程序以打开 comport，发送“S”，然后关闭 comport 并等待。然后我让它循环这个过程，这样它就可以继续打开和关闭端口。我的希望是，这将使连接不会达到几个小时的标记和超时或其他什么。结果程序成功循环了一个小时，然后突然无法打开COM端口……这完全把我吓坏了，我不知道该怎么办……

如果 CrazyCasta 是对的，而且只是我的 Arduino 与笔记本电脑的连接有问题，有没有办法在无需先重新启动计算机的情况下重置连接？

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1 回答 1

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正如 CrazyCasta 所说，这是一个硬件问题。我可以通过移除我的 Arduino 和计算机之间的 9 英尺（2.7 m）USB 延长线来解决这个问题。

截至今天早上，该连接已经运行了十个小时，比之前的测试长了七个小时。我希望可以安全地说这是固定的。

于 2012-11-05T14:09:15.317 回答