Working with the FT232RL USB-chip. Theo Kleijn (www.pa0kn.nl) has made a small testboard with an Atmega32 and all I/O to a seperate LED. With the FTDI MPROG.EXE program I can change the use of the CBUS-connection of the FT232RL. Also the Atmega32 gets it clock from the CBUS4 connection of the FT232RL at 12 Mhz.
Now, with a Visual Basic program with the FTD2XX.DLL library it is possible to set and reset these four extra lines. Switching the DTR and RTS seperatly is still a problem, the first time we plug in the USB-cable everything is working fine, after that RTS and DTR won’t work. We need this to configure the AD9851 on the USBDRM. Have to send a 40 bit codestream and switch a 4017 for bandwidth selection.