Re: [avr-chat] Can AVRDude communicate with an FT232R using the D2XX drivers instead of a VCP?

[Xiaofan Chen]

On Mon, Jan 2, 2012 at 9:03 AM, Anthony Andriano
<address@hidden> wrote:
> I am currently using AVRDude to communicate with my devices over a virtual
> com port and an FT232R (USB <-> UART bridge). I see that AVRDude has a
> programmer type called avrftdi, but I don't think it provides a solution to
> my problem. At the moment, when I want to communicate with my device, I have
> the ability to use the FT232R in native USB mode through the vendor supplied
> DLL. However, when I want to access the bootloader, I have to change the
> EEPROM in the FT232R to enumerate as a VCP. Then, AVRDude can
> communicate using "-c avr911 -P comXX".

I do not think you need to change the EEPROM. FTDI driver has an
option to load VCP driver which override normal device behavior.

+++++++
Windows Device Manager --> Universal Serial Bus controllers -->
USB Serial Converter --> Advanced -->

Configuration

Use these settings to override normal device behavior.

(checkbox) Load VCP
+++++++

You can use the above to load VCP on the fly.

> What I want is a way to communicate with the AVR using the supplied DLL over
> a native USB interface without needing the VCP at all. Can AVRDude already
> do this?
>
> Basically, I am asking if AVRDude uses any of the API calls in the FTDI
> provided DLL called FTD2XX.DLL such as FT_Write() and FT_Read() to write and
> read bytes from the AVR. I do not want to enumerate my device as a VCP, but
> I still want to be able to communicate with the bootloader using a VCP.

Maybe this is close to what you want, not using libftd2xx, but libftdi,
http://helix.air.net.au/
You can use the libusb-win32 filter driver option so that you
can still use the FTDI driver.

-- 
Xiaofan