On Sat, Sep 10, 2011 at 3:16 AM, Joerg Wunsch <[email protected]> wrote: > Xiaofan Chen <[email protected]> wrote: >>> B.t.w.: How common are Full-Speed hubs. Is debugging worth the effort? >>> And do you really bitbang? Why not MPSSE? > >> I do not think it is that common now. It is good to be used a debugging >> tool. So I think this is not a high priority fix. > > For me, I do have a good number of fullspeed hubs around. My only > highspeed hub is used whenever I need to plugin a mass storage device, > but everything else (in particular, all that microcontroller stuff) > runs on fullspeed hubs. > > My entire point is: if a FT232H device on a fullspeed hub runs at > *much* lower speed than a FT2232D one *on the same hub*, something > must be fishy. The expected behaviour would be that it achieves > approximately the same speed.
This is a good point. The code will probably need to detect the current speed (which is only added to libusb-1.0 git recently) http://git.libusb.org/?p=libusb-stuge.git;a=summary;js=1 or current max packet size (512B in high speed mode, 64B in full speed mode). > And yes, with "bitbanging", I was just referring to the net result on > the AVR microcontroller that is being programmed; all this is done > through the MPSSE, of course. > -- Xiaofan -- libftdi - see http://www.intra2net.com/en/developer/libftdi for details. To unsubscribe send a mail to [email protected]
