As usual nice responses, thanks.
3. USB host driver will convert that URB into different packets and will
transmit to USB device. The packet size will be as defined in USB spec
and as listed in protocol spec and also depends on what type of
transfers are happening.
Yes.
4. USB host driver will call completion only iff all packets are
transmitted and thus one URB is transmitted correctly. Yes?
Yes.
Actually no. If usb_submit_urb() succeeded then the completion routine
will definitely be called, whether or not the URB was transmitted
correctly.
Alright.
And in that case my urb->status (in my completion callback routine) will
tell whether URB transmitted correctly or not. Yes ?
And urb->status will show successful only when all packets and thus one
URB is transmitted successfully. right?
Alan Stern
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Thanks,
Viral Mehta,
Embedded Software Engineer,
Tel. No. 91 79 26563705, Ext. 423
www.einfochips.com <http://www.einfochips.com>
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