Device Emulator COM port problems

Device Emulator COM port problems

• Joshua Nobes

  Can u send this application tod etect com 1 and com2 to me at sunena_sharma@yahoo.com
  

• clint 2

  I did some investigation and discovered a bug in the way the emulator initializes the PC's COM port. The result is that the character length and number of stop bits may not match the settings your software specified for the port.

  The fix is in the DeviceEmulator V3, which doesn't yet have an ETA for when it will be available to the public. In the meantime, if you can modify your software, try setting the character length and number of stop bits to 7 and 2, then set them to whatever your app needs. That'll force the emulator to set the PC's COM port to match.

  With the bug fix, I'm able to use ActiveSync-over-serial to sync my emulator and install apps, using the 115200 baud configuration. That was the biggest workload I could come up with for serial emulation.

  Barry

  
  

• .NETPhreak

  Actually the code should have been:
  
  //////////////////////////////////////////////////
  dcb.StopBits = TWOSTOPBITS;
  dcb.ByteSize = 7;
  
  if(SetCommState( hComm, &dcb ) == 0)
  return FALSE;
  //////////////////////////////////////////////////
  
  dcb.StopBits = ONESTOPBIT;
  dcb.Parity = NOPARITY;
  dcb.ByteSize = 8;
  
  if(SetCommState( hComm, &dcb ) == 0)
  return FALSE;
  
  But this doesn't work either.
  
  

• J_Dude2003

  Hi Barry
  
  I tried the following (see '//// FIX ///' section) but it didn't make any difference. Is this what you meant
  
  hComm = CreateFile( portIdent,
  GENERIC_READ | GENERIC_WRITE,
  0, // exclusive access
  NULL, // no security attrs
  OPEN_EXISTING,
  0, // non-overlapped I/O
  NULL);
  
  if(hComm == INVALID_HANDLE_VALUE)
  return FALSE;
  
  // setup device buffers
  SetupComm( hComm, 4096, 4096 );
  
  // purge any information in the buffer
  PurgeComm( hComm, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR );
  
  dcb.DCBlength = sizeof(dcb);
  GetCommState(hComm, &dcb);
  dcb.BaudRate = baudRate;
  dcb.fParity = FALSE;
  dcb.fNull = 0;
  
  ////////////////// FIX //////////////////////
  dcb.StopBits = TWOSTOPBITS;
  dcb.ByteSize = 7;
  //////////////////////////////////////////////////
  
  dcb.StopBits = ONESTOPBIT;
  dcb.Parity = NOPARITY;
  dcb.ByteSize = 8;
  
  if(SetCommState( hComm, &dcb ) == 0)
  return FALSE;
  
  
  
  Mark
  
  
  

• R8VI

  Can u send this application to detect com 1 and com2 to me at sunena_sharma@yahoo.com
  

• Yorker

  Serial Port 1 is in use by the CE kernel, for debug output. So apps generally cannot use it for themselves.

  The emulator has been used to drive serial ports as fast as 460,800 baud, but the emulator isn't fast enough to sustain that rate, so flow control (CTS/DTS or xon/xoff) is usually needed to throttle the data transfers. Serial I/O performance is something we'll be working on in an upcoming emulator release.

  I have a copy of Boling's book and will try out the CEChat app. Can you post some specifics of your machine configuration CPU speed, memory size, and serial ports. What kind of serial device are you connecting the emulator to, and what kind of serial hardware is in your PC

  Thanks,

  Barry

  
  

• Dan Mikkelsen

  OK, it looks like the emulator doesn't like a connection at 115200 or 19200 baud. 9600 seems to be more reliable.
  
  Is there a document anywhere detailing what COM settings are useable on the emulator
  
  

• outcast1881

  My machine configuration is:
  Manuf: HP
  OS: Microsoft Windows XP Professional (SP2)
  RAM: 1GB
  CPU: Pentium 4, 3.00GHz
  RS232: one inbuilt port designated as COM1
  
  I'm connecting to a data logger that we've developed which does not use flow control. Hence I am not using this on the CE app I'm developing. Also I've written a Win32 app that uses the PC's COM1 and this works fine so I'm confident my hardware is OK.
  
  Since the last post I've found that even using 9600 is not guaranteed to work. I think it was just a coincidence that changing the baud rate helped. Doing a hard reset on the emulator doesn't seem to resolve the problem which is intermittent
  
  
  
  
  
  
  

• Karl Hulme

  I am having a similar problem, the COM port on my host machine is a USB adapter. It works fine on the PC (with an RS232 GPS connection) using Hyperterminal but does not enumerate in the VS2005 Tools | Options | Device Tools | Devices | Properties | Emulator Options | Peripherals Com drop down boxes. I can see other Coms listed in there that were created when I was playing with Bluetooth connections but not this one (Com3).

  I suspect this might be more appropriate in the VS 2005 forum but thought I would try here first

  James Reid

  
  

• Ewild

  Thanks for the data about your machine. It's definitely plenty fast. I'll investigate, but it will take me a a week or two.

  Barry

  
  
• Device Emulator COM port problems