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Message
From: "Gayathri Seshadri" <gaysesh@h...>
Date: Mon, 6 Oct 2003 14:06:44 +0530
Subject: Re: [usb] how to receive successive data after clear_feature()?
Hi,
To my knowledge, the mass storage device will not be able to
differentiate between the bulkIN for the data stage and the
bulk IN for the CSW on conditions following a short packet. That is why,
it sends a STALL following a short packet(IN-data). So it is
required that the software do a CSW(13 bytes) after the clear_feature
command
and then proceed on with a successive cbw-[data]-csw patterns..
Hope the above is clear and correct.
Do update.
Regards,
Gayathri Seshadri.
----- Original Message -----
From: <midas@j...>
To: <usb@o...>
Sent: Monday, October 06, 2003 12:09 PM
Subject: [usb] how to receive successive data after clear_feature()?
> hi,
> I'm developing a USB Mass Storage device, Bulk-Only protocol.
> I use READ(10) command to get data. When bulk-in execute, the
> host get "STALL". I use clear_feature to clear "STALL". After clear
> _feature, next bulk-in command get a message "NAK", why?
>
> My clear_feature command :
> Packet 1> SETUP from host to ADDR=0x08, EP = 0
> Packet 2> DATA0 (0x02 , 0x01 , 00 , 00 , 0x82, 00 , 00 , 00) from host
> Packet 3> ACK from device to Host
> Packet 4> IN from host to ADDR=0x08, EP = 0
> Packet 5> ACK from device to Host
>
> ps:My bulk-in command use EP=2 ADDR=0x08.
>
> Is my method wrong? Or should I use other commands?
> Thanks a lot.
>
>
>
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