Home > Archive > MSDN > January 2006 > Can not detect parity errors, fParity value not retained
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Can not detect parity errors, fParity value not retained
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| GBaker 2005-06-10, 3:56 pm |
| I've tried a number of variations on the classic set upof a COM port (below)
and can not get the fParity member of the DCB to remain TRUE after calling
SetCommState(). An immediate call to GetCommState() shows the fParity member
to be reset to 0. The app is only using the Rx and Tx lines for custom 9-bit
protocol.
PortDCB.DCBlength = sizeof (DCB);
// Get the default port setting information.
GetCommState (hPort, &PortDCB);
// Change the DCB structure settings.
PortDCB.BaudRate = 9600; // Current baud
PortDCB.fBinary = TRUE; // Binary mode; no EOF check
PortDCB.fParity = TRUE; // Enable parity checking
PortDCB.fOutxCtsFlow = FALSE; // No CTS output flow control
PortDCB.fOutxDsrFlow = FALSE; // No DSR output flow control
PortDCB.fDtrControl = DTR_CONTROL_ENABLE;
// DTR flow control type
PortDCB.fDsrSensitivity = FALSE; // DSR sensitivity
PortDCB.fTXContinueOnXoff = TRUE; // XOFF continues Tx
PortDCB.fOutX = FALSE; // No XON/XOFF out flow control
PortDCB.fInX = FALSE; // No XON/XOFF in flow control
PortDCB.fErrorChar = FALSE; // Disable error replacement
PortDCB.fNull = FALSE; // Disable null stripping
PortDCB.fRtsControl = RTS_CONTROL_ENABLE;
// RTS flow control
PortDCB.fAbortOnError = FALSE; // Do not abort reads/writes on
// error
PortDCB.ByteSize = 8; // Number of bits/byte, 4-8
PortDCB.Parity = NOPARITY; // 0-4=no,odd,even,mark,space
PortDCB.StopBits = ONESTOPBIT; // 0,1,2 = 1, 1.5, 2
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| Martin Goff 2006-01-19, 6:57 pm |
| How did you solve this problem? I have the exact same issue and can't find
any answers to this.
Thank you.
Martin
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