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From: rkumar_31@y...<rkumar_31@y...>
Date: Wed May 5 08:48:53 CEST 2004
Subject: [usb] HOW TO Clear STALL condition?
Hello all,
can some one give me the microsoft enumeration sequence ?

Thankyou
ravi


----- Original Message -----
From: Jeff Lin <jlin87@y...>
To: usb@o..., midas@j...
Date: Wed, 12 Nov 2003 15:01:29 -0800 (PST)
Subject: Re: [usb] HOW TO Clear STALL condition?

> Here you are setting 2B wIndex = 0x8200. That could be the source
> of probelm.
> According to spec, you will need to set wIndex tto EP for clear
> feature of EPs.
> You may want to try with wIndex = 2, the EP#, i.e.
> Setup,payload(0x02,0x01,00,00, 00, 02, 00,00),In,
>
> Do update.
> midas@j... wrote:
> 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"
> To:
> 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:
> > To:
> > 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? > > > > > > > > > > > > Do you Yahoo!? > Protect your identity with Yahoo! Mail AddressGuard >

Follow up	Author
[usb] HOW TO Clear STALL condition?	Ravi Rajaraman