Hi,
I'm having some trouble with my USB device.
I'm posting this here, as I'm using the USBSER.SYS driver to make it
appear as a CDC ACM modem/virtual comport, and it may be a known
problem with the driver (well, you can always hope it's someone elses
fault :-) .
On ~5% of the PCs it's been installed on, the serial communication
hangs as soon as my device have made its first bulk IN transfer (i.e.
the first bytes sent over the virtual comport).
The transfer is never acknowledged, and the communication hangs.
Up to this point, enumeration and opening the comport goes well.
Sending data to from host to device also works, and does not hang the
device.
I put a BusHound log of an OK run at:
http://magnus.freeshell.org/douglas_vcp_ok_1.txt
I get a similar log from my laptop:
http://magnus.freeshell.org/douglas_error_tx529.txt
- up until it hangs after the first IN transmission!
Both are running Windows 2000.
1) Does the problem look familiar to anyone here?
2) Could you point me to the right specs, so I can make make heads or
tails of the last USB request block, NT I/O request packet and NT IRP
stack location?
I've seen the problem mainly on laptops, but also on one stationary
PC, all of them running Windows XP (but most PCs run XP now, so that
may not be a factor).
My device uses the Atmel AT91RM9200 uC (with its embedded USB device
controller).
My code is largely based on Atmel's example:
http://www.atmel.com/dyn/resources/prod_documents/doc4322.pdf
and
AT91RM9200-BasicUSB-ARM1_2-2_0.zip at
http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3193
Thanks for reading this, and if you can help me
/Magnus