[Libusb-devel] extra bytes

[Weijun Z. <zh...@uc...>]

I had a wierd problem and thought maybe somebody here know why
or had similar expirence.

The problem is that sometimes I got an extra byte from my usb device.
The usb device generate 70 bytes every second and I use bulk read
to read the data into host with Maximum packet size of 64 byte.

Typically I got 64 bytes in the first read and 6 bytes in the following read
when the data become available in the usb device and 0 bytes otherwise.
But sometime I got 64 bytes in the first read and 7 bytes in the
second read. I examined the received data. The last byte of the first read
got repeated as the first byte in the second read in this case.

It is unlikely a libusb problem but I still hope people here may had similar
experience.

Thanks.
Weijun.