Re: CRC of data packet
David Brownell <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Sunday 15 April 2007 11:07 am, John Wojnaroski wrote: > Hi, > > I've been plowing through the various specs on USB trying to find an > answer, but my eyes are starting to hurt ;-) > > Perhaps some one knows the answer and a pointer to the reference > > Does USB require a CRC of the data packet for the four types of msgs > sent? If so is that value calculated by the software or the hardware > chip? If software, in the kernel or by the application? Hardware handles the end-of-packet CRCs; software never sees them. > Using usbmon does not give any indication that a CRC is appended to the > packet. However, the device I'm sending to expects to see a CRC value. > It works with an MS windows test program, but I don't have the source, > just the .exe file and the results. > > Regards > John > > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel