RE: [Libusb-win32-devel] USB unplugged

[Dan E. <Dan...@ne...>]

The call to bulk transfer will return an error, i.e. a return code less
than 0. It's up to you how you recover. The device behaviour depends
upon what chip you are using, but when it's plugged in again the OS will
execute a USB reset, so the device will see that.
=20
Whether you implement timeouts is completely up to you and your hardware
configuration. It's probably a good idea because if the device gets
stuck and stops consuming data, the host will keep retrying to send it,
and as long as the device has died completely, the host won't stop.
=20
Dan.

________________________________

From: lib...@li...
[mailto:lib...@li...] On Behalf Of
Andrew Xiang
Sent: 03 May 2006 21:42
To: lib...@li...
Subject: [Libusb-win32-devel] USB unplugged


What happens when I am doing data bulk transfer and the USB cable is
unplugged? How will the Host software know and recover? And how will the
firmware recover. I assume when the host software recover, it can send
over RESET tell the device to recover also?=20
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I guess it need to put some sort of timeout in the device also for the
RX/TX.
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=20
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-Andrew
=20