I'm using a few USB7 boards (ATmega48-powered LED displays controlled with AVR-CDC, http://spiffie.org/kits/usb7/) and they work fine when connected directly to my computer (a Mac), but I cannot send data to them when they are connected to a USB hub.
When I have them connected to a hub, the appropriate /dev/cu.usbmodem*** devices appear, but attempting to write data to them does nothing. Sometimes I'll get a "resource busy" error or a hang.
Has anyone else encountered this problem when using AVR-USB/AVR-CDC devices through a hub? Is the problem with AVR-USB, AVR-CDC, or the USB7-specific code? Any suggestions on how I could fix this?
