[英]Read after restart - RS232 Serial communication using Serial Library - C++
我試圖通過使用 C++ 的串行庫和在以下位置找到的一些示例,通過串行連接從 RS-232 讀取: http : //www.codeproject.com/Articles/992/Serial-library-for-C
是否有任何信號檢測方法或事件讓我知道。 我使用串行轉 USB 連接器將Rx和Neutral ONLY 連接到電路板,並使用 Visual Studio 2013 中的串行庫並用 C++ 編寫代碼。
我想將從我的電路板傳輸的 ASCII 數據寫入一個文本文件,當它手動重新啟動時,這樣我就可以很容易地從文本文件中解析數據。
我的板子只有在重新啟動時才傳輸發送數據。 我是串行連接的新手,我無法弄清楚如何讓我的程序在電路板重置時理解讀取數據。
我正在使用監聽程序:
#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] = '\0';
//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;
}
我確實在我的 while 語句中設置了一些斷點,並試圖重新啟動電路板。 然后我像這樣將數據寫入我的文本文件。
路線 1:
數據:"H¢~A,B™žX
字節讀取:100
路線 2:
數據:x]Ãßÿ$¢œŒ2Y¶S Ieó1ñ\\@ó8¬!)þ
字節讀取:30
我知道這個數據不正確,我應該得到 ASCII 數據。 是否有任何庫支持解決我的問題?
我需要在 UART 重新啟動后讀取數據,一旦停止接收數據,它應該將所有數據寫入文本文件。
請幫我解決這個問題,非常感謝。
在設置功能中設置錯誤的波特率會產生錯誤的輸出。
lLastError = serial.Setup(CSerial::EBaud115200,CSerial::EData8,CSerial::EParNone,CSerial::EStop1);
並且
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;
而不是下面的這段代碼(每次都會覆蓋文本文件並且看不到數據)
//writing data to text file
std::ofstream o("save.txt");
o << "Data: " << szBuffer << std::endl << "BytesRead: " <<dwBytesRead <<std::endl;
將數據附加到文本文件中,這將給出通過 RS232 傳輸的完整數據,可以在文本文件中看到。
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