18 Jan
2006
18 Jan
'06
4:06 p.m.
On Wed, Jan 18, 2006 at 01:16:55PM -0600, Richard Smith wrote:
I believe he is refering to if the device can operate as a USB host
bridge rather than just as a usb device. OTG devices and some
embedded chips can be both.
Yes, that is what I'm refering to. AFAIK I haven't any chance to access
an USB 'device' (device/slave/peripheral mode, eg MIDI/audio interfaces)
from another one that isn't capable to do/switch to 'host mode', be it a
host controller or an on-the-go (OTG) device.
Citing from http://en.wikipedia.org/wiki/USB
A USB system has an asymmetric design, consisting of a host controller
and multiple devices connected in a tree-like fashion using special
hub devices, called USB hubs.
and
An extension to USB called USB On-The-Go allows a single port to act
as either a host or a device - chosen by which end of the cable plugs
into the socket on the unit. Even after the cable is hooked up and the
units are talking, the two units may "swap" ends under program
control. This facility targets units such as PDAs where the USB link
might connect to a PC's host port as a device in one instance, yet
connect as a host itself to a keyboard and mouse device in another
instance.
Jacob
Sounds great, but I'm a little bit confused by
other information I found
on the web about USB host mode support:
I'm confused too. I've never heard of "USB host mode", what is it?