On Tue, Jun 23, 2009 at 10:37 AM, David Brownell<[email protected]> wrote: > On Sunday 21 June 2009, Xiaofan Chen wrote: >> > As an aside, has anyone had the opportunity to try OpenOCD with an >> > FT2232H-based dongle? I believe high-speed USB should almost eliminate >> > latency effects due to going from 1 ms-based frames to 125 us-based >> > microframes. >> > >> >> Not sure here. The blocking I/O will render the benefits of high speed >> USB much less effective. >> >> David Brownell is the real USB expert in the list. He may answer better, >> at least on the Linux side since he is one of the leading Linux usb >> developers. > > I responded to that a while back. The round-trip latency may > well go down with Linux-USB host side drivers. >
This makes me think there is a solution for performance on the Linux side, a kernel driver which supports the D2XX similar interface will solve quite some issues. Maybe libftdi+libusb will not be necessary in that case. It seems that there are some work on that front in the Linux usb mailing list. -- Xiaofan http://mcuee.blogspot.com _______________________________________________ Openocd-development mailing list [email protected] https://lists.berlios.de/mailman/listinfo/openocd-development
