🚀 go-pugleaf

Ramy wrote:

>int InitCommunication( void )
>{
>  char    ComName[30] = "COM1";
>  HANDLE  ComHndl = NULL;
>  DCB     my_DCB;

	DCB	my_DCB = {sizeof(DCB),0};

>  ComHndl = CreateFile( ComName, GENERIC_WRITE + GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL ); 
>
>  if ( ComHndl == INVALID_HANDLE_VALUE )
>    return 0;
>
>  my_DCB.DCBlength = sizeof( my_DCB );
//  my_DCB.DCBlength = sizeof( my_DCB ); set in declaration

move this here:
>  if ( !BuildCommDCB( "COM1:19200, M, 8, 1", &my_DCB ) )
>    return 0;

Stop the program here in the debugger and inspect my_DCB
See which fields have been set and which have not.
Don't set again the fields that have been properly set.
Set any fields that don't have the proper settings.

>  my_DCB.BaudRate  = 19200;
//  my_DCB.BaudRate  = 19200; set by build
>  my_DCB.fBinary   = true;
>  my_DCB.ByteSize  = 8;
//  my_DCB.ByteSize  = 8; set by build
>  my_DCB.fBinary   = true;
//  my_DCB.fBinary   = true; you already did that
>  my_DCB.fParity   = 1;
>  my_DCB.Parity    = MARKPARITY;
//  my_DCB.Parity    = MARKPARITY; should have been set by build
>  my_DCB.StopBits  = 1;
//  my_DCB.StopBits  = 1; set by build
>
>  if ( !SetCommState( ComHndl, &my_DCB ) )
>    return 0;

Stop the program here and see if my_DCB has changed.

>  if ( GetCommState( ComHndl, &my_DCB ) )

You are saying that here it has changed.
Try GetCommMask() and see if EV_ERR is set.

	DWORD	mask;
	GetCommMask( ComHndl, &mask );
	if( EV_ERR == ( mask & EV_ERR ) )
	{	printf( "Parity Errors Enabled");
	}else{	printf( "Parity Errors Disabled");
	};
Maybe fParity reflects the state of the handler.

>  return 1;
>}

>then the SetCommState() function FAILS !! 

What is the value of GetLastError when if fails?


>my_DCB.fParity = 1; 
>
>right above the SetCommState() function, then if i check it's 
>value after the sucess call for GetCommState() i see that it's 
>value is '0' AGAIN !
>
>How can it be?  WHAT am i doing wrong here ? 

Does it really matter?
It is supposed to indicate whether or not parity errors are reported
to you.