[prev in list] [next in list] [prev in thread] [next in thread] 

List:       libusb-devel
Subject:    Re: How to set the USB transfer type manually
From:       Tim Roberts <timr () probo ! com>
Date:       2012-09-19 21:35:10
Message-ID: 505A3A8E.1070800 () probo ! com
[Download RAW message or body]

dinamex wrote:
> How is this calculated?

You can see in the descriptors that endpoint 81 is listed as "2 x 880". 
That means it gets 2 transactions of 880 bytes each in every
microframe.  There are 8 microframes per frame, and 1000 frames per
second.  So:
    2 x 880 x 8 x 1000 = 14,080,000
Similarly. endpoint 82 is listed as "3 x 860":
    3 x 860 x 8 x 1000 = 20,640,000

-- 
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.


------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
libusb-devel mailing list
libusb-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/libusb-devel
[prev in list] [next in list] [prev in thread] [next in thread]