IPaq 2215 / 4155

I have written a communication program in C# that use the COM1 port of the
IPaq 2215 and it works fine. I have not loaded the program on a 4155 and it
is having timeout problems when I start doing xmodem transfers. Since I can
send data slowly fine I am not even sure where to look.

Does anybody have a idea if there is a difference between the two models
other then the WiFi... and if it's the WiFi why does turning it off not
resolve the problem.

Regards,
John

John
Sat Jun 19 14:37:45 CDT 2004

Oh well I found the problem. My Xmodem function checks the TX buffer value
returned, which never reachs zero so... As I said in the previous message
this is not a problem on the 2215... If I replace the function that waits
for the TX buffer to empty with a short timer my program again works fine.
The program also works fine with a change to the DllImport on a desktop.

Does anybody have any clue on this?

Code used (some snagged from web):

while(e.TXBytes > 0) // Yea bad programing :)
{
if(AbortTransfer())
return;
Sleep(1);
}

if (Win32Com.ClearCommError(hPort, out er, out cs))
{
e.RXbytes = cs.cbInQue;
e.TXbytes = cs.cbOutQue;
}

[DllImport("coredll.dll")]
internal static extern bool ClearCommError(IntPtr hFile, out UInt32
lpErrors, out COMSTAT cs);

[StructLayout( LayoutKind.Sequential )] internal struct COMSTAT
{
internal const uint fCtsHold = 0x1;
internal const uint fDsrHold = 0x2;
internal const uint fRlsdHold = 0x4;
internal const uint fXoffHold = 0x8;
internal const uint fXoffSent = 0x10;
internal const uint fEof = 0x20;
internal const uint fTxim = 0x40;
internal UInt32 Flags;
internal UInt32 cbInQue;
internal UInt32 cbOutQue;
}

Regards,
John