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Ramy
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 Posted: Sun May 29, 2005 12:22 pm Post subject: How can i set the Parity Bit to 0 or 1 as i want ? |
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Hi, down below is the function that i use to initiate my com port,
for some messages i need to set the Parity Bit to '1', and for
other messages i need to reset this bit to '0', how do i do that?
Thanks!
Ramy.
int InitCommunication( void )
{
COMMTIMEOUTS read_timeout; // timeout structure
char com_params[60];
char ComName[30];
HANDLE ComHndl = NULL;
DCB my_DCB; // device control block structure
if ( SystemInfo.ErrorInfo.Status != NO_ERRORS ) // If Error -> Exit
return 0;
if ( SystemInfo.ComInfo.ComHandle ) // If Port already open
{
CloseHandle( SystemInfo.ComInfo.ComHandle ); // Close Port
SystemInfo.ComInfo.ComHandle = NULL; // Reset Port Handle
}
my_DCB.DCBlength= sizeof( my_DCB ); // Sizeof(DCB)
my_DCB.BaudRate = SystemInfo.ComInfo.BaudRate; // Current baud rate
my_DCB.fBinary = true; // Binary mode, no EOF check
my_DCB.ByteSize = 8; // Number of bits/byte, 4-8
my_DCB.Parity = NOPARITY; // 0-4=no,odd,even,mark,space
my_DCB.StopBits = 1; // 0, 1, 2 = 1, 1.5, 2
my_DCB.fOutxCtsFlow = 0; // CTS output flow control
my_DCB.fOutxDsrFlow = 0; // DSR output flow control
my_DCB.fDtrControl = DTR_CONTROL_ENABLE; // DTR flow control type
my_DCB.fDsrSensitivity = 0; // DSR sensitivity
my_DCB.fTXContinueOnXoff = 0; // XOFF continues Tx
my_DCB.fOutX = 0; // XON/XOFF out flow control
my_DCB.fInX = 0; // XON/XOFF in flow control
my_DCB.fErrorChar = 0; // Enable error replacement
my_DCB.fNull = false; // Enable null stripping
my_DCB.fRtsControl = RTS_CONTROL_ENABLE; // RTS flow control
my_DCB.fAbortOnError = 0; // Abort reads/writes on error
my_DCB.XonLim = 50; // Transmit XON threshold
my_DCB.XoffLim = 50; // Transmit XOFF threshold
my_DCB.XonChar = 0; // Tx and Rx XON character
my_DCB.XoffChar = 0; // Tx and Rx XOFF character
my_DCB.ErrorChar = 0; // Error replacement character
my_DCB.EofChar = 0; // End of input character
my_DCB.EvtChar = 0; // Received event character
read_timeout.ReadIntervalTimeout = 0; // Read Interval Timeout
read_timeout.ReadTotalTimeoutMultiplier = 0; // Read Total Timeout Multiplier
read_timeout.ReadTotalTimeoutConstant = SystemInfo.ComInfo.RxTimeout; // Read Total Timeout Constant
read_timeout.WriteTotalTimeoutMultiplier = 0; // Write Total Timeout Multiplier
read_timeout.WriteTotalTimeoutConstant = SystemInfo.ComInfo.TxTimeout; // Write Total Timeout Constant
strcpy( com_params, SystemInfo.ComInfo.ComPort ); // Prepare com_params
strcpy( ComName, SystemInfo.ComInfo.ComPort ); // Set ComName
switch ( SystemInfo.ComInfo.BaudRate )
{
case CBR_9600:
strcat( com_params, ":9600, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_14400:
strcat( com_params, ":14400, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_19200:
strcat( com_params, ":19200, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_38400:
strcat( com_params, ":38400, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_56000:
strcat( com_params, ":56000, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_57600:
strcat( com_params, ":57600, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_115200:
strcat( com_params, ":115200, N, 8, 1" ); // Prepare COM Parameters
break;
};
ComHndl = CreateFile( ComName, GENERIC_WRITE + GENERIC_READ, 0, NULL, // Open the asked Com Port
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL );
if ( ComHndl == INVALID_HANDLE_VALUE ) // Check COM Handle
return FAIL;
if ( !BuildCommDCB( com_params, &my_DCB ) ) // Fills DCB Structure with Com Values
return FAIL;
if ( !SetCommState( ComHndl, &my_DCB ) ) // Configures Com Port
return FAIL;
if ( !SetCommTimeouts( ComHndl, &read_timeout ) ) // Set Tx & Rx Timeouts
return FAIL;
SystemInfo.ComInfo.ComHandle = ComHndl; // Set Communication Handle
return PASS; // COM Init was successful
}
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Ramy
Guest
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| Posted: Sun May 29, 2005 1:27 pm Post subject: Re: How can i set the Parity Bit to 0 or 1 as i want ? |
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Is there any better group to send this question to?
Thanks,
Ramy.
"Ramy" <Ramy (AT) NoMail (DOT) com> wrote:
| Quote: |
Hi, down below is the function that i use to initiate my com port,
for some messages i need to set the Parity Bit to '1', and for
other messages i need to reset this bit to '0', how do i do that?
Thanks!
Ramy.
int InitCommunication( void )
{
COMMTIMEOUTS read_timeout; // timeout structure
char com_params[60];
char ComName[30];
HANDLE ComHndl = NULL;
DCB my_DCB; // device control block structure
if ( SystemInfo.ErrorInfo.Status != NO_ERRORS ) // If Error -> Exit
return 0;
if ( SystemInfo.ComInfo.ComHandle ) // If Port already open
{
CloseHandle( SystemInfo.ComInfo.ComHandle ); // Close Port
SystemInfo.ComInfo.ComHandle = NULL; // Reset Port Handle
}
my_DCB.DCBlength= sizeof( my_DCB ); // Sizeof(DCB)
my_DCB.BaudRate = SystemInfo.ComInfo.BaudRate; // Current baud rate
my_DCB.fBinary = true; // Binary mode, no EOF check
my_DCB.ByteSize = 8; // Number of bits/byte, 4-8
my_DCB.Parity = NOPARITY; // 0-4=no,odd,even,mark,space
my_DCB.StopBits = 1; // 0, 1, 2 = 1, 1.5, 2
my_DCB.fOutxCtsFlow = 0; // CTS output flow control
my_DCB.fOutxDsrFlow = 0; // DSR output flow control
my_DCB.fDtrControl = DTR_CONTROL_ENABLE; // DTR flow control type
my_DCB.fDsrSensitivity = 0; // DSR sensitivity
my_DCB.fTXContinueOnXoff = 0; // XOFF continues Tx
my_DCB.fOutX = 0; // XON/XOFF out flow control
my_DCB.fInX = 0; // XON/XOFF in flow control
my_DCB.fErrorChar = 0; // Enable error replacement
my_DCB.fNull = false; // Enable null stripping
my_DCB.fRtsControl = RTS_CONTROL_ENABLE; // RTS flow control
my_DCB.fAbortOnError = 0; // Abort reads/writes on error
my_DCB.XonLim = 50; // Transmit XON threshold
my_DCB.XoffLim = 50; // Transmit XOFF threshold
my_DCB.XonChar = 0; // Tx and Rx XON character
my_DCB.XoffChar = 0; // Tx and Rx XOFF character
my_DCB.ErrorChar = 0; // Error replacement character
my_DCB.EofChar = 0; // End of input character
my_DCB.EvtChar = 0; // Received event character
read_timeout.ReadIntervalTimeout = 0; // Read Interval Timeout
read_timeout.ReadTotalTimeoutMultiplier = 0; // Read Total Timeout Multiplier
read_timeout.ReadTotalTimeoutConstant = SystemInfo.ComInfo.RxTimeout; // Read Total Timeout Constant
read_timeout.WriteTotalTimeoutMultiplier = 0; // Write Total Timeout Multiplier
read_timeout.WriteTotalTimeoutConstant = SystemInfo.ComInfo.TxTimeout; // Write Total Timeout Constant
strcpy( com_params, SystemInfo.ComInfo.ComPort ); // Prepare com_params
strcpy( ComName, SystemInfo.ComInfo.ComPort ); // Set ComName
switch ( SystemInfo.ComInfo.BaudRate )
{
case CBR_9600:
strcat( com_params, ":9600, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_14400:
strcat( com_params, ":14400, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_19200:
strcat( com_params, ":19200, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_38400:
strcat( com_params, ":38400, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_56000:
strcat( com_params, ":56000, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_57600:
strcat( com_params, ":57600, N, 8, 1" ); // Prepare COM Parameters
break;
case CBR_115200:
strcat( com_params, ":115200, N, 8, 1" ); // Prepare COM Parameters
break;
};
ComHndl = CreateFile( ComName, GENERIC_WRITE + GENERIC_READ, 0, NULL, // Open the asked Com Port
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL );
if ( ComHndl == INVALID_HANDLE_VALUE ) // Check COM Handle
return FAIL;
if ( !BuildCommDCB( com_params, &my_DCB ) ) // Fills DCB Structure with Com Values
return FAIL;
if ( !SetCommState( ComHndl, &my_DCB ) ) // Configures Com Port
return FAIL;
if ( !SetCommTimeouts( ComHndl, &read_timeout ) ) // Set Tx & Rx Timeouts
return FAIL;
SystemInfo.ComInfo.ComHandle = ComHndl; // Set Communication Handle
return PASS; // COM Init was successful
}
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Bob Gonder
Guest
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| Posted: Sun May 29, 2005 5:00 pm Post subject: Re: How can i set the Parity Bit to 0 or 1 as i want ? |
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Ramy wrote:
| Quote: | Hi, down below is the function that i use to initiate my com port,
for some messages i need to set the Parity Bit to '1', and for
other messages i need to reset this bit to '0', how do i do that?
|
Usual setting is NoParity, which is what you have set.
Change the value to Even, Odd, Mark or Space as you require.
| Quote: | my_DCB.Parity = NOPARITY; // 0-4=no,odd,even,mark,space
|
#define NOPARITY 0
#define ODDPARITY 1
#define EVENPARITY 2
#define MARKPARITY 3
#define SPACEPARITY 4
| Quote: | strcat( com_params, ":9600, N, 8, 1" ); // Prepare COM Parameters
|
Change the N to the proper value.
Not 100% sure about m and s, but probably N, O, E, M, S
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Thomas Maeder [TeamB]
Guest
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| Posted: Sun May 29, 2005 6:05 pm Post subject: Re: How can i set the Parity Bit to 0 or 1 as i want ? |
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"Ramy" <Ramy (AT) NoMail (DOT) com> writes:
| Quote: | Is there any better group to send this question to?
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I don't think so - this seems like the right place for your question.
But please direct your browser at http://info.borland.com/newsgroups/
and read the newsgroup guidelines. One of them asks us not to quote
entire posts we are following up to; instead, please trim the quotes
to the parts relevant for your reply. Thanks!
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Ramy
Guest
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| Posted: Mon May 30, 2005 6:59 am Post subject: Re: How can i set the Parity Bit to 0 or 1 as i want ? |
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Thanks, i'll try that :-)
read the newsgroup guidelines. One of them asks us not to quote
| Quote: | entire posts we are following up to; instead, please trim the quotes
to the parts relevant for your reply. Thanks!
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Ramy
Guest
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| Posted: Mon May 30, 2005 7:13 am Post subject: Re: How can i set the Parity Bit to 0 or 1 as i want ? |
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But you did not answer my question -
Please show me one code for setting the parity bit to '1', and
another code for setting the parity bit to '0', thanks.
Ramy
Bob Gonder <notbg (AT) notmindspring (DOT) invalid> wrote:
| Quote: | Ramy wrote:
Hi, down below is the function that i use to initiate my com port,
for some messages i need to set the Parity Bit to '1', and for
other messages i need to reset this bit to '0', how do i do that?
Usual setting is NoParity, which is what you have set.
Change the value to Even, Odd, Mark or Space as you require.
my_DCB.Parity = NOPARITY; // 0-4=no,odd,even,mark,space
#define NOPARITY 0
#define ODDPARITY 1
#define EVENPARITY 2
#define MARKPARITY 3
#define SPACEPARITY 4
strcat( com_params, ":9600, N, 8, 1" ); // Prepare COM Parameters
Change the N to the proper value.
Not 100% sure about m and s, but probably N, O, E, M, S
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Bob Gonder
Guest
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| Posted: Mon May 30, 2005 2:50 pm Post subject: Re: How can i set the Parity Bit to 0 or 1 as i want ? |
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Ramy wrote:
| Quote: | But you did not answer my question -
Please show me one code for setting the parity bit to '1', and
another code for setting the parity bit to '0', thanks.
|
To set the parity bit so it is a 1 for every chaaracter, use
MARKPARITY
To set the parity bit so it is a 0 for every character, use
SPACEPARITY.
To automatically set the number of 1 bits so there is always an odd
number, use ODDPARITY (Of the 9 totalt bits (8 data + 1parity),there
will be an odd number of 1 bits).
To automatically set the number of 1 bits so there is always an even
number, use EVENPARITY (Of the 9 totalt bits (8 data + 1parity),there
will be an even number of 1 bits).
Use SetCommState() with the properly modified DCB.
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Ramy
Guest
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| Posted: Tue May 31, 2005 8:01 am Post subject: Re: How can i set the Parity Bit to 0 or 1 as i want ? |
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Thanks very much!
| Quote: | To set the parity bit so it is a 1 for every chaaracter, use
MARKPARITY
To set the parity bit so it is a 0 for every character, use
SPACEPARITY.
[...] |
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