After hours of failed attempts i ask your help once more
I'm writin a simple GUI interface ,working under Windows XP, to communicate with some existing boards mounting FTDI FT232RQ.
At first i used the Virtual COM VCP drivers 2.08.14 ,everything worked fine,but now i need to use the FTD2XX.dll functions.
Many function were working OK,as FT_ListDevices,FT_Open,FT_SetBaudRate,FT_SetDataCharacteristics.
I have problems with FT_Write returning FT_INVALID_HANDLE,i call it just after verified that FT_Open returns FT_OK.
Can you explain the reason of such an error?Does it depend from previous installations of VCP drivers?
Many thanks Diego