libftdi Archives

Subject: libusb device search problem

From: Robert Hubley <rhubley@xxxxxxxxxxxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Wed, 29 Sep 2010 15:23:01 -0700
Heads up. While tracking down a problem with libftdi not seeing my clearly attached USB device. I found a potential problem with the way libusb searches for USB devices under the linux OS. It uses a priority search starting with an environment variable followed by the /dev/bus/usb hierarchy and then the /proc/bus/usb hierarchy. On my particular Debian system it looks like /dev/bus/usb is only partially populated with devices ( perhaps the ones supported by kernel drivers??? ), while /proc/bus/usb contains a dynamic list of all the devices. I solved the problem by reversing the order of this search ( /proc/bus/usb first ). Not a problem with libftdi per se...but I wanted to put this up somewhere in case anyone else was banging their heads over this.


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