I try to make working a Sparkfun USB Shield with an Arduino Mega. I have modified "USB_desc" sample sketch in order to show the current USB state with time in milliseconds (following http://www.circuitsathome.com/
). I can see state changing from "Reset device" to "Wait SOF", but after nothing hapens. I have tried different USB devices connected to the USB host shield, but the behavior is always the same.
This is what is displayed :
202 - 0x20: Settle
403 - 0x30: Reset device
404 - 0x40: Wait reset complete
405 - 0x50: Wait SOF
Thanks for suggestions.