libftdi Archives

Subject: Re: fdti_usb_open() (device not found)

From: Xiaofan Chen <xiaofanc@xxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Wed, 30 May 2012 07:37:08 +0800
On Wed, May 30, 2012 at 4:07 AM, Devon Lind <devon@xxxxxxxxxxxxxxxx> wrote:
> On Fri, May 25, 2012 at 2:56 AM, Xiaofan Chen <xiaofanc@xxxxxxxxx> wrote:
>> Did you install the libusb-win32 filter driver? I assume you
>> want to use the libftdi-0.20 (and not libftdi-1.0).
>>
>> You can use either libusb-win32 device driver (replace
>> the original FTDI driver) or filter driver (keep the exising
>> FTDI driver).
>
> Yes I am using the libftdi-0.20.  Installing the filter driver seemed
> to do the trick for a few minutes.
> But now, in the device manager (Windows 7), it won't even recognize
> the device as a COM port.
> I plug in the USB and it pops up in "Other Devices" as an "Unknown
> Device" and then disappears after
> a few seconds.

That should not happen. You can remove the filter easily
by using the GUI filter wizard to see if the device
appear as COM port again.

Make sure you use the latest libusb-win32 which is
of version 1.2.6.0.


-- 
Xiaofan

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