On Monday 18 June 2007 09:30:12 Antonio Galea wrote: > Hello all, > I'm trying to interface an RFID-tag reader to the Fox, and have trouble > with the USB connection. > > The model I have is the IDBlock-RA from EuroChip (more info can be found > here: http://www.eurochip.com/4/sistemi/idblock/info.htm). > > It's USB interface is the USB/UART converter CP2101 from Silabs, and > since it's > driver is included in the 2.6 kernels, I'd expect it to work - in > fact, my host > machine just sees the reader when I plug it on the bus. > > I've compiled the kernel enabling cp2101.ko as a module and loaded it > on a Fox; > when I plug in the reader, dmesg shows me a few errors Could you post the errors, please?
> reports that the deviceis connected as /dev/ttyUSB0, then disconnects it > almost immediately and > start doing this again and again. Has anybody tried that driver and know > it's stability? > I suspect that my problem could be a power issue - the docs says my reader > requires a 400mA current, and while my PC provides it on the USB bus, I > don't know if the Fox is able to do the same. Any hints on this issue, too? The USB root-hub is required to deliver 500mA on each of the two ports. I run several devices requesting 500mA without problems. You could put a self-powered USB-hub, inbetween the foxboard and the device to test your power-problem theory. Eberhard
