Objective Development Forums

Re: v-usb only accept 8 bytes per packet?

2009-10-26T23:09:00+02:00

The low level USB packets are always maximum 8 bytes for low speed devices. Larger blocks are transferred in chunks of 8 bytes. V-USB handles this more or less transparently, it calls usbFunctionRead() and usbFunctionWrite() for blocks of 8 bytes.

Statistics: Posted by christian — Mon Oct 26, 2009 11:09 pm

Re: v-usb only accept 8 bytes per packet?

2009-10-23T19:14:34+02:00

Config your in and out endpoint to 8 bytes. bulk out endpoint will recive all 31 byte of command, but it take 4 transfer.
For more iformation this is my realization of bulk endpoints
http://depositfiles.com/files/00ar212ls

Statistics: Posted by Guest — Fri Oct 23, 2009 7:14 pm

Re: v-usb only accept 8 bytes per packet?

2009-10-08T18:53:25+02:00

default USB_BUFFSIZE = 11, I set USB_BUFFSIZE = 67,It' working

Statistics: Posted by nhchmg — Thu Oct 08, 2009 6:53 pm

v-usb only accept 8 bytes per packet?

2009-10-06T12:19:19+02:00

I want to implements a mass storage device,but the bulk command is 31 bytes,what can I do?
thanks advance.

Statistics: Posted by nhchmg — Tue Oct 06, 2009 12:19 pm