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Message
From: Jeff Lin <jlin87@y...>
Date: Wed, 12 Nov 2003 14:38:27 -0800 (PST)
Subject: Re: [usb] how to receive successive data after clear_feature()?
Did you double chcek that EP2 was configured correctly as
IN Endpoint and Bulk-type?
If the settings are correct, you should make sure EP2 does have data available before
you make bulk-in request.
Did the probelm solved?
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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