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Notes on libusb and pyusb
=========================
Libusb provides access to the USB bus from user space. It uses the
files in /dev/bus/usb/*/*. The following commands are useful on Linux:
List devices on the USB bus:
lsusb
Add -d 16c0:05dc for a specific device, -v for more information.
List file permissions for bus 001 device 005:
ls -l /dev/bus/usb/001/005
These permissions default to 660 group root.
List udev information for bus 001 device 005:
udevadm info --query=all --name=/dev/bus/usb/001/005 --attribute-walk
These items can be used in udev rules.
Default USB permissions do not allow a non-root user to write to the bus.
To change permissions, add a rule to /etc/udev/rules.d/local.rules like this:
SUBSYSTEM=="usb", ATTR{idVendor}=="16c0" , ATTR{idProduct}=="05dc", MODE="0666", GROUP="dialout"
Then notify udev with "udevadm control --reload_rules", or /etc/init.d/udev/restart. But
on my system, I need to plug in the SoftRock and reboot.
To install Libusb on Windows, follow the instructions in
http://sourceforge.net/apps/trac/libusb-win32/wiki.
Run the program libusb-win32*/bin/inf-wizard.exe.
On Windows, when libusb-win32 is properly installed, Device Manager reports a
top-level device "libusb-win32 devices" and a sub-device "DG8SAQ-I2C". Otherwise
it reports "Unknown Device" under "Universal Serial Bus controllers".
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