重启后读取 - 使用串行库的 RS232 串行通信 - C++

Question

我正在尝试通过使用 C++ 的串行库和在以下位置找到的一些示例，通过串行连接从 RS-232 读取数据： http://www.codeproject.com/Articles/992/Serial-library-for-C

有没有信号检测方法或事件让我知道。我仅使用串口转 USB 连接器将 Rx 和 Neutral 连接到电路板，并在 Visual studio 2013 中使用串口库并编写C++ 中的代码。

我想在手动重启时将从我的板传输的 ASCII 数据写入文本文件，这样我就可以很容易地从文本文件中解析数据。

我的板子只有在重启时才会发送发送数据。我是串行连接的新手，我无法弄清楚如何让我的程序理解在电路板重置时读取数据。

我正在使用监听程序：

#define STRICT
#include <tchar.h>
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include "Serial.h"

//C++ headers
#include <iostream>
#include <fstream>
#include <string>

enum { EOF_Char = 27 };

int ShowError (LONG lError, LPCTSTR lptszMessage)
{
    // Generate a message text
    TCHAR tszMessage[256];
    wsprintf(tszMessage,_T("%s\n(error code %d)"), lptszMessage, lError);

    // Display message-box and return with an error-code
    ::MessageBox(0,tszMessage,_T("Listener"), MB_ICONSTOP|MB_OK);
    return 1;
}

//int __cdecl _tmain (int /*argc*/, char** /*argv*/)
int WINAPI _tWinMain(HINSTANCE /*hInst*/, HINSTANCE /*hInstPrev*/, LPTSTR /*lptszCmdLine*/, int /*nCmdShow*/)
{
    CSerial serial;
    LONG    lLastError = ERROR_SUCCESS;

    const char* Port_name = "COM3";

    // Attempt to open the serial port (COM1)
    lLastError = serial.Open(_T(Port_name),0,0,false);
    if (lLastError != ERROR_SUCCESS)
        return ::ShowError(serial.GetLastError(), _T("Unable to open COM-port"));

    // Setup the serial port (9600,8N1, which is the default setting)
    lLastError = serial.Setup(CSerial::EBaud9600,CSerial::EData8,CSerial::EParNone,CSerial::EStop1);
    if (lLastError != ERROR_SUCCESS)
        return ::ShowError(serial.GetLastError(), _T("Unable to set COM-port setting"));

    // Register only for the receive event
    lLastError = serial.SetMask(CSerial::EEventBreak |
                                CSerial::EEventCTS   |
                                CSerial::EEventDSR   |
                                CSerial::EEventError |
                                CSerial::EEventRing  |
                                CSerial::EEventRLSD  |
                                CSerial::EEventRecv);
    if (lLastError != ERROR_SUCCESS)
        return ::ShowError(serial.GetLastError(), _T("Unable to set COM-port event mask"));

    // Use 'non-blocking' reads, because we don't know how many bytes
    // will be received. This is normally the most convenient mode
    // (and also the default mode for reading data).
    lLastError = serial.SetupReadTimeouts(CSerial::EReadTimeoutNonblocking);
    if (lLastError != ERROR_SUCCESS)
        return ::ShowError(serial.GetLastError(), _T("Unable to set COM-port read timeout."));

    // Keep reading data, until an EOF (CTRL-Z) has been received
    bool fContinue = true;
    do
    {
        // Wait for an event
        lLastError = serial.WaitEvent();
        if (lLastError != ERROR_SUCCESS)
            return ::ShowError(serial.GetLastError(), _T("Unable to wait for a COM-port event."));
        else
            return ::ShowError(serial.GetLastError(), _T("Waiting for a COM-port event."));

        // Save event
        const CSerial::EEvent eEvent = serial.GetEventType();

        // Handle break event
        if (eEvent & CSerial::EEventBreak)
        {
            printf("\n### BREAK received ###\n");
        }

        // Handle CTS event
        if (eEvent & CSerial::EEventCTS)
        {
            printf("\n### Clear to send %s ###\n", serial.GetCTS()?"on":"off");
        }

        // Handle DSR event
        if (eEvent & CSerial::EEventDSR)
        {
            printf("\n### Data set ready %s ###\n", serial.GetDSR()?"on":"off");
        }

        // Handle error event
        if (eEvent & CSerial::EEventError)
        {
            printf("\n### ERROR: ");
            switch (serial.GetError())
            {
            case CSerial::EErrorBreak:      printf("Break condition");          break;
            case CSerial::EErrorFrame:      printf("Framing error");            break;
            case CSerial::EErrorIOE:        printf("IO device error");          break;
            case CSerial::EErrorMode:       printf("Unsupported mode");         break;
            case CSerial::EErrorOverrun:    printf("Buffer overrun");           break;
            case CSerial::EErrorRxOver:     printf("Input buffer overflow");    break;
            case CSerial::EErrorParity:     printf("Input parity error");       break;
            case CSerial::EErrorTxFull:     printf("Output buffer full");       break;
            default:                        printf("Unknown");                  break;
            }
            printf(" ###\n");
        }

        // Handle ring event
        if (eEvent & CSerial::EEventRing)
        {
            printf("\n### RING ###\n");
        }

        // Handle RLSD/CD event
        if (eEvent & CSerial::EEventRLSD)
        {
            printf("\n### RLSD/CD %s ###\n", serial.GetRLSD()?"on":"off");
        }

        // Handle data receive event
        if (eEvent & CSerial::EEventRecv)
        {
            // Read data, until there is nothing left
            DWORD dwBytesRead = 0;
            char szBuffer[101];
            do
            {
                // Read data from the COM-port
                lLastError = serial.Read(szBuffer,sizeof(szBuffer)-1,&dwBytesRead);
                if (lLastError != ERROR_SUCCESS)
                    return ::ShowError(serial.GetLastError(), _T("Unable to read from COM-port."));

                if (dwBytesRead > 0)
                {
                    // Finalize the data, so it is a valid string
                    szBuffer[dwBytesRead] = '[=10=]';

                    //writing data to text file
                    std::ofstream o("save.txt");
                    o << "Data: " << szBuffer << std::endl << "BytesRead: " <<dwBytesRead <<std::endl;

                    // Display the data
                    printf("%s", szBuffer);

                    // Check if EOF (CTRL+'[') has been specified
                    if (strchr(szBuffer,EOF_Char))
                        fContinue = false;
                }
            }
            while (dwBytesRead == sizeof(szBuffer)-1);
        }
    }
    while (fContinue);

    // Close the port again
    serial.Close();
    return 0; 
}

我确实在我的 while 语句中设置了一些断点，并试图重新启动电路板。然后我像这样将数据写入我的文本文件。

线索 1：

Data: "H¢˜A,B™žX
BytesRead: 100

线索 2：

Data: x]Ãßÿ$¢œŒ2Y¶SIeó1ñ\@ó8¬!)þ
BytesRead: 30

我知道这个数据不正确，我应该得到 ASCII 数据。是否有任何库支持解决我的问题？

我需要在UART重启后读取数据，一旦它停止接收数据，它应该将所有数据写入一个文本文件。

请帮帮我，非常感谢。

Answer 1

在设置函数中设置错误的波特率会给出错误的输出。

 lLastError = serial.Setup(CSerial::EBaud115200,CSerial::EData8,CSerial::EParNone,CSerial::EStop1);

还有

std::ofstream output_file;
        //Creating a text file
        output_file.open("save_test.txt", std::ios_base::app);
            //writing data to text file
                output_file /*<< "Data: "*/ << szBuffer;

而不是下面的代码（每次都会覆盖文本文件并且看不到任何数据）

  //writing data to text file
                    std::ofstream o("save.txt");
                    o << "Data: " << szBuffer << std::endl << "BytesRead: " <<dwBytesRead <<std::endl;

将数据追加到文本文件中，在文本文件中可以看到RS232传输的完整数据。

重启后读取 - 使用串行库的 RS232 串行通信 - C++

Read after restart - RS232 Serial communication using Serial Library - C++

c++

serialization

serial-port

serial-communication