USB Serial Gadget was Re: at91sam9g45 USB OTG support?

Nicolas et al,

Thank you for the information.  For the moment I have a boot option to
use either 2 host ports or a host and a device port.  That would seem
to fit my needs except for the case that I'm loading the usb serial
gadget as a module and then specifying in the inittab that getty use
it as ttyGS0.  In that case connecting the device port to a host does
not seem to ever register on the host.  If I remove the getty line
from inittab and then run getty manually after it boots, it works
fine.  To add insult to injury, then it will work after reboot also
until a hard power down.

Anyone experience this?

Thank you,

Rob

On Tue, Nov 9, 2010 at 9:46 AM, Nicolas Ferre [off-list ref] wrote:

Le 05/11/2010 22:09, Rob Emanuele :

quoted

Greetings,

We've been developing a at91sam9g45 product and it is finally available at:
https://www.crystalfontz.com/product/CFA910.html

Very nice platform!

quoted

We are looking into supporting USB OTG on this device as the 'g45 has
the USB host/device port. ?As far at I can tell Atmel or anyone else
working on this platform has not made full use of this as an OTG
device.

Indeed, it is not done for the moment...

quoted

?I haven't found support in the USB or the OTG code for
reading the USB ID line to determine host or device mode.

I am not sure USB ID is well supported by consumer cable providers and
is a reliable way to determine host or device mode.

quoted

Am I missing something or is that an area that needs some code written for it?

Anyway, using this port as host or device is a matter of
1/ driving or not VBUS pin
2/ dealing with loading the gadget driver (as the "Enable" of the usba
IP is responsible for swithing to device mode).

I think that determining if the port shall be used in host or device
mode can be asked through the GUI... But note that I am not an USB expert...
--
Nicolas Ferre


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