-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Somebody in the thread at some point said: | Hi, | | I have a microcontroller based USB device and want to connect it to the | Freerunner (in host mode). Now I need some clarifications on the resistor | trick: | | The two 15k Ohm resistors are indispensable to comply with USB-spec?
Yes, for reliable detection of the device presence. | What will happen if I connect the device (with the resistors) to the USB port | of my computer? (The external power supply is turned of) It should be fine. | How do I have to design the USB endpoints on the device, so the Freerunner | does charge with 1A? Or do I need the 47k Ohm resistor if the FR is in host | mode? Only the 47K resistor is looked for to see if a charger is around. | At | http://wiki.openmoko.org/wiki/Specialized_USB_cables#How_to_make_a_USB_cable_for_powering_attached_USB_devices_and_charging_the_Neo_while_in_host_mode_.28aka_Y- | Cable.29 | it is written that "Future kernels should switch to hostmode + external power | when seeing this 47k resistor." Is this already implemented? Nope. | Furthermore, it is mentioned that the resistors can be used to avoid suspend | of the Freerunner. I hope, I still can suspend if I want? No idea what the author of that page is on about there, none of this will impact either USB suspend or device suspend. - -Andy -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAkmw7IUACgkQOjLpvpq7dMoerQCfTCBZ7WNeOVt9zEFqj2K7NNxU P7YAoJTRyeYiXcg/bFg4lUGF0eiPi/Z/ =P/Cs -----END PGP SIGNATURE----- _______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
