On Mon, Jan 28, 2013 at 4:30 PM, Freddie Chopin <[email protected]> wrote: > W dniu 2013-01-28 09:14, Peter Stuge pisze: >> Freddie Chopin wrote: >>> It must be stated that ft2232.c has at least two important >>> advantages over ftdi.c: >>> 1. it can use ftd2xx, which for some people IS important >> >> Why is it important? > > I see at least these reasons: > > 1. It's said to be faster and it was faster than ft2232.c @ libftdi. I > don't have a comparison with ftdi.c though...
I have done some comparisons last time when testing mpsse codes, mpsse is still faster than the default d2xx implenmentation as of now. On the other hand, ft2232.c is not optimized for libftdi-1.0 and ftd2xx's asynchronous API. So the speed could be improved using ftd2xx's async API or libftdi-1.0's async API. I've seen one private ftd2xx mod which achieve similar speed to mpsse under Windows. > 2. If one uses the adapter with some other tools that use ftd2xx driver > (99% of commercial tools) then there's no need to change the driver > every time you need to use the other program. Yes, I know about the > filter-driver, but not everyone uses it. The libusb-win32 filter driver will work for libftdi-0.x but not libftdi-1.x which depends on libusb-1.0/libusbx. libusb.org does not yet support libusb-win32 driver yet. libusbx 1.0.14 does support libusb-win32 device driver but there are issues with the filter driver so the filter driver will not work for FT2232x. > 3. Most adapter vendors don't bother to provide any other driver than > ftd2xx (sometimes even with a nice OpenOCD binary linked to ftd2xx.dll). > > The most important is the first one, so I'll have to browse the net > searching for such binary or maybe I'll try to compile myself and check... Yes it would be interesting to see how you come to. I tend to believe that mpsse will be faster than the stock ftd2xx code since ft2232.c does not fully use the potential of ftd2xx. -- Xiaofan ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d _______________________________________________ OpenOCD-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/openocd-devel
