RS-232 different speed on console vs window

I have a simple application that I made to test the flow of data from a device.  I had trouble with slow communications with another program, so I wrote this one to test only RS-232 communications. My problem is that I get the result differs depending on whether I have compiling the program as a console application or a windowed application.

My device sends packets of 70 bytes message at 100 Hz using 460800 baud, 8-N-1.  I use a USB adapter for series, which is supposed to support the baud rate.  Using the console application, I get about 7 000 bytes per second, which is what I expect.  However, when you run a windowed application, I get about 34 bytes/second.  Anyone got any ideas on why there is such a big difference?  (CVI 2013 on Win7)

Code is below.  I use the inputs are: [COM port number], 460800, 1.








int main)

{

   FILE * outFile;

   FILE * binFile;

   int iNumBytes = 0;

   char cMessageArray [720];

   Secret int;

   int iPortNum;

   long lBaud;

   int iByteRead;

   int iGetRate;

   char cFileName [20];

   time_t timeStart;

   time_t timeStop;

   long lByteCount = 0;

   long lTimeoutCount = 0;

   long lNumSeconds = 0;


printf ("recorder Port.  ") \nWrites bytes received on the port selected in a file ({Port #} .txt) .\n\nEnter COM port: ");"

   scanf ("%i", & iPortNum);

   printf ("\nEnter baud rate:" "");

   scanf ("%u", & lBaud);

   printf ("\nEnter 1 just calculate the byte rate:" "");

   scanf ("%i", & iGetRate);


printf ("\nListening on the port %i to baud rate %i (8-N-1) w/half second timeout.  ") Press any key to stop. \n", iPortNum, lBaud);


DisableBreakOnLibraryErrors();


Secret = OpenComConfig (iPortNum, "", lBaud, 0, 1, 8, 8192, 1024);

   SetComTime (iPortNum, 0.5); COM read the time-out in seconds


<= istatus="">

   {

      Open output files

      sprintf ('% u.txt', cFileName, iPortNum);

      outFile = fopen (cFileName, 'wt');

      sprintf ('% u.bin', cFileName, iPortNum);

      binFile = fopen (cFileName, "wb");


time (& timeStart);


If (1! = iGetRate)

      {

         While (!.) KeyHit())

         {

            iByteRead = ComRdByte (iPortNum);


If (-99! = iByteRead) / / IF not a timeout

            {

               iByteRead = iByteRead & 0x00FF;

               fprintf (outFile, "%.2X", iByteRead);

               printf ("%.2X", iByteRead);

               cMessageArray [iNumBytes] = (char) (iByteRead & 0x00FF);

               iNumBytes ++;

               lByteCount ++;


If (70 is iNumBytes)

               {

                  fwrite (cMessageArray, 1, 70, binFile);

                  iNumBytes = 0;

                  printf ("\n");

               }

            }

            on the other

            {

               fprintf (outFile, 'TIMEOUT');

               printf ("TIMEOUT");

               lTimeoutCount ++;

            }

         }

      }

      on the other

      {

         While (!.) KeyHit())

         {

            iByteRead = ComRdByte (iPortNum);


If (-99! = iByteRead) / / IF not a timeout

            {

               lByteCount ++;

            }

            on the other

            {

               lTimeoutCount ++;

            }

         }

      }


time (& timeStop);

      lNumSeconds = timeStop - timeStart;


printf ("bytes = %i seconds = %i bytes/s = %f\nTimeouts = %i\n", lByteCount, lNumSeconds, (float) ((float) lByteCount / (float) lNumSeconds), lTimeoutCount);


fflush (outFile);

      fclose (outFile);

      CloseCom (iPortNum);

   }

   on the other

   {

      printf ("cannot open the COM port.");

   }


printf ("\nPress any key to close. \n ») ;


GetKey();


While (!.) KeyHit())

   {}


return 0;

}

Thank you!

Your program GUI can be affected by the CVI political intelligence defined in the environment options.

I seem to remember that the value default for this setting is to sleep more, which means THAT CVI give much time to the operating system to serve other tasks or programs. You can try with some sleep or not sleep; in the latter case, don't forget to insert some ProcessSystemEvents somewhere in your application to allow to honor events of UI in the case otherwise you will not be able to exit the loop.

The same option can be set programmatically by calling SetSleepPolicy)

Tags: NI Software

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