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Message
From: midas@j...
Date: Fri, 3 Oct 2003 11:59:13 +0200
Subject: Re: [usb] HOW TO Clear STALL condition?
i have already tried your method, but still fail.
following is my messages:
CLEAR_FEATURE sequence:
Setup,payload(0x02,0x01,00,00,0x82,00,00,00),In,
endpoint 0x02 ,address 0x08(my define)
but it still gets "STALL".
Is my method wrong? Or should I use other commands?
Thanks a lot.
----- Original Message -----
From: "Gayathri Seshadri" <gaysesh@h... >
To: <usb@o... >
Date: Fri, 3 Oct 2003 09:38:18 +0530
Subject: Re: [usb] HOW TO Clear STALL condition?
>
>
> Hi,
>
> As far as my experience with the USB mass storage protocol, i would
> suggest you to do a clear feature endpoint stall to the IN endpoint
> of the
> bulk type. Normally the cbw suggests the expected no. of bytes in
> one of
> its 31 bytes and the bulk IN endpoint if has only lesser to the
> expected no.
> of bytes, it sends a STALL.
> As i suggested earlier, you can try "CLEAR_FEATURE"(endpoint stall)
> for
> the bulk in endpoint that stalled.
>
> Let me know if this helped..
>
> Regards,
> Gayathri Seshadri.
>
> ----- Original Message -----
> From: <midas@j... >
> To: <usb@o... >
> Sent: Thursday, October 02, 2003 1:36 PM
> Subject: [usb] HOW TO Clear STALL condition?
>
>
> > Hi,
> > I'm a newbie to USB and USB mass storage devices.
> > I have a little trouble with my Cypress SL811HS Host
> Controller.
> > I've got the device to enumerate and I've found all of it's
> endpoints and
> > I'm able to send CBW's to the bulk OUT endpoint and read my
> data from
> > the IN endpoint as well as getting my CSW out from the IN
> endpoint.
> > For certain commands like INQUIRY and REQUEST SENSE I have
> already
> > been able to execute in the following sequence..
> > 1. Send CBW to bulk OUT endpoint
> > 2. Read DATA from bulk IN endpoint
> > 3. Read CSW from bulk IN endpoint.
> >
> > For commands like READ_10 and READ_CAPACITY use sequence
> above.
> > The device WILL be stalled by host.
> > Is this STALL just a handshaking message to differentiate a
> data
> > transfer from a CSW transfer? And how to clear this STALL
> condition?
> > I approciate your help.
> >
> > i.e.
> > Read_Capacity
> > Host Device
> > OUT_CBW ->
> > In ->
> > <- Data(1st)
> > In ->
> > <- Data(2nd)
> > In ->
> > <- Data(3rd)
> > In ->
> > <- Data(4th)
> > In ->
> > <- Data(5th)
> > In ->
> > <- Data(6th)
> > In ->
> > STALL -> //How to clear
> this stall
> message
> > //and
> continue getting
> the following
> > //data?
> >
> >
> >
>
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