Objective Development Forums

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... "

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.