Re: 586 Evaluation Kit and USB slave driver using WinCE -- Support Forum for CompuLab's X86CORE & X86BASE Products

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Subject: Re: 586 Evaluation Kit and USB slave driver using WinCE

Author:
rizky

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Date Posted: 21:48:29 02/23/03 Sun
In reply to: Gideon (for Vova) 's message, "Re: 586 Evaluation Kit and USB slave driver using WinCE" on 04:28:47 08/05/02 Mon

>Baud rate in USB Serial does not matter. It is
>implemented just to conform
>to a standard of serial port, but changing it does not
>affect anything.
>
>The slow speed of communication is not due to baud
>rate. I thing that it is
>because of protocol you have implemented. For example
>if you send a data by
>packets of one byte and then wait for acknowledge on
>each byte, you will get
>a very bad performance. The better idea is to send a
>large blocks of data.
>
>These restrictions are because USB is not really a
>serial port. It is only
>an emulation and it has some drawbacks.
>
>I will not write all the details of the protocol here,
>you can read about
>them in the document on USB Serial (.DOC). However the
>basic line of
>designing good protocol is sending big blocks of data
>with minimum
>dependencies on acknowledges.
>
>I tested the speed of USB Serial: it is about 100-130
>KByte/sec. You may
>even see it by running Zoom program that downloads
>target screen. If you run
>ActiveSync on USB and disconnect network, you will see
>the speed of
>downloading the image.

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Replies:

Subject	Author	Date
Re: 586 Evaluation Kit and USB slave driver using WinCE	John Drohan	04:51:13 08/01/03 Fri