libftdi Archives

Subject: Re: libftdi only works if /dev/ttyUSBx is accessed by other method first

From: Jim Paris <jim@xxxxxxxx>
To: Pelle Windestam <pelle@xxxxxxxxx>
Cc: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Wed, 24 Oct 2012 15:49:52 -0400
Pelle Windestam wrote:
> I did some more testing and it appears that it doesn't work with the
> unmodified FTDI eeprom either as I stated in my first e-mail. In
> both cases I need to use /dev/ttyUSBx access first to get
> libftdi-access working.

If you want to really dive in deep, you can modprobe the usbmon
module, use wireshark to get a full dump of the bus traffic, and
compare the two cases to see what might be missing in the libftdi-only
case.

-jim

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