[ECOS] USB 2.0 slave?

[ECOS] USB 2.0 slave?

[Slide]

Has anyone looked at what needs to be done, if anything, to support
USB 2.0 in the USB slave package? I noticed that only 1.1 is currently
supported based on the defines for supported version

#define USB_DEVICE_DESCRIPTOR_USB11_LO           0x10
#define USB_DEVICE_DESCRIPTOR_USB11_HI            0x01

Would supporting 2.0 be as simple as adding another define for 2.0? I
am not intimately familiar with USB, but if there is anything I can do
to help, I would be interested as we are looking at using eCos for an
internal board we are developing.

Thanks,

slide

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Re: [ECOS] USB 2.0 slave?

[Frank Pagliughi]

Slide wrote:
> Has anyone looked at what needs to be done, if anything, to support
> USB 2.0 in the USB slave package? I noticed that only 1.1 is currently
> supported based on the defines for supported version
>
> #define USB_DEVICE_DESCRIPTOR_USB11_LO           0x10
> #define USB_DEVICE_DESCRIPTOR_USB11_HI            0x01
>
> Would supporting 2.0 be as simple as adding another define for 2.0? I
> am not intimately familiar with USB, but if there is anything I can do
> to help, I would be interested as we are looking at using eCos for an
> internal board we are developing.
>
> Thanks,
>
> slide
>
>   

Yes, if your hardware is 2.0 compatible, you can simply indicate that in 
your device descriptor. (Yeah, we should probably add those constants to 
the USB header). If it's a Full Speed device, that's probably all you 
need to do. If it's a High Speed device you may have a little more work 
to do to implement and/or debug the high speed enumeration. I don't 
believe that any of the existing USB device drivers are for high speed 
devices, so there may not be any implementation to negotiate into high 
speed.

Frank

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