some problem in "bulk in transfer"

General discussions about V-USB, our firmware-only implementation of a low speed USB device on Atmel's AVR microcontrollers
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nhchmg
Posts: 8
Joined: Mon Sep 28, 2009 3:59 am

some problem in "bulk in transfer"

Post by nhchmg » Tue Oct 06, 2009 10:39 pm

1, On bulk in transfer ,always the host can't see first pakcet,for example: device send amount 36 bytes,8 bytes per packet, host only receive 28 bytes.
2. On bulk in transfer,if i continue with send, host will ruleless can't see any packet.
3. In AVR-Droper code ,he said "// start with empty frame because the host eats the first packet -- don't know why... "

christian
Objective Development
Objective Development
Posts: 1443
Joined: Thu Nov 09, 2006 11:46 am

Re: some problem in "bulk in transfer"

Post by christian » Sat Oct 24, 2009 10:45 pm

Still don't know why...

You can experiment with data toggling: Whether you start with a DATA0 or DATA1 packet. But this was not a solution for me.

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