Hello all,
I have written a program which listens to the serial port and records
certain parts of the data that it receives. I have been testing this by
sending text files over the serial port via HyperTerminal. I suspect there
is a problem with how I am flushing the buffer upon opening. The situation
is that if I open a serial connection and then start streaming data
everything works perfectly. However if I start streaming data before
opening a serial connection, the code blocks at the SerReceiveFlush call and
only continues once there is a break in the data flow. Has anyone seen this
or know about a fix? I will include my OpenSerialPort() method to make this
question more clear. Thanks very much in advance.
/***********************************************************************/
void OpenSerialPort(void)
{
Err error = 0;
FormPtr frmP;
Word ObjectIndex;
int alertButtonPressed;
error = SysLibFind("Serial Library", &gSerialReference);
if (error)
{
FrmAlert(OpenPortAlert);
}
error = SerOpen(gSerialReference, PORT, BAUD);
// SER_BUFFER_MAX is a constant set to 2500 //
SerSetReceiveBuffer (gSerialReference, gSerialBuff, SER_BUFFER_MAX);
switch (error)
{
case serErrAlreadyOpen:
SerClose(gSerialReference);
alertButtonPressed = FrmAlert(PortBusyAlert);
if(alertButtonPressed == 0)
SysReset();
if(alertButtonPressed == 1)
FrmAlert(PortUnavailableAlert);
break;
case noErrors:
gSerialPortOpen = true;
frmP = FrmGetActiveForm();
//show connection icon
ObjectIndex = FrmGetObjectIndex(frmP, PortOpenBitmap);
FrmShowObject(frmP, ObjectIndex);
AddLineToMessageBox("serial port opened");
break;
default:
FrmAlert(OpenPortAlert);
break;
}
SerReceiveFlush(gSerialReference, 20); //**POSSIBLE BLOCK**//
// next line here for debug purposes -- will show me when it flushes
//
FrmCustomAlert(UserDefinedAlert,"buffer flushed",NULL,NULL);
}
/***********************************************************************/
------------------------
Chris Chayka
Software Engineer
ElanTech, Inc.
[EMAIL PROTECTED]
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