On Thu, 29 Jun 2006, JackRain wrote:
> the procedure is :
> 1)bulk-out endpoint occurs,read endpoint fifo to get CBW
> 2)decode CBW and found the unsupported command
> 3)how to react if the command I don't want to implement ?
> 4)I tried as i told previously but got bus reset.
>
> I want to know the right way:)
> Shall the endpoint muct be stalled??
There are two ways to report that you don't support a command.
The first way:
If dCBWDataTransferLength > 0 and the Direction bit in
bmCBWFlags is 0 (Out), stall the bulk-out endpoint. If
either of those conditions is false, stall the bulk-in
endpoint.
After the host clears the endpoint's halt feature, prepare
to send a CSW with bCSWStatus = 1 and dCSWResidue = the
value of dCBWDataTransferLength.
If the next CBWCB from the host is a REQUEST SENSE command,
send back key=0x05, ASC=0x24, ASCQ=0x00.
The second way:
If dCBWDataTransferLength > 0 and the Direction bit in
bmCWFlags is 0 (Out), receive dCBWDataTransferLength bytes
on the bulk-out endpoint and ignore their values. If
dCBWDataTransferLength > 0 and the Direction bit in bmCBWFlags
is 1 (In), transmit dCBWDataTransferLength bytes containing
0x00 on the bulk-in endpoint. If dCBWDataTransferLength = 0,
go directly to the next step.
Send a CSW with bCSWStatus = 1 and dCSWResidue = the value
of dCBWDataTransferLength.
If the next CBWCB from the host is a REQUEST SENSE command,
send back key=0x05, ASC=0x24, ASCQ=0x00.
I don't know if Windows will work properly with the second way.
Alan Stern
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