Christian Vogel vogelchr at
Sat Jan 8 12:26:23 UTC 2011

Hi Kevin,

> usb 4-1: usbfs: interface 0 claimed by cdc_acm while 'sam7' sets config  
> #1

sam7 can talk to the device either by using libusb, or by utilizing the  
serial port of the Linux kernel.

You have compiled sam7 to use usb directly, so you have to rmmod usbserial  
and/or cdc_acm,
because they will block your attempts to talk to the device via libusb.  
is the error message you've seen in your kernel log.

(check io_libusb.c (usb) and io_posix.c (emulated serial port) in the  
sam7utils source code,
  it unfortunately provides very little feedback if things don't work out  


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