2011/3/13 Andrew Errington <a.erring...@lancaster.ac.uk>:
> On Fri, 11 Mar 2011 19:37:36 wander.lairson wrote:
>
> I'm not sure. SnoopUSB tells me there is no endpoint involved (it is n/a),
> and you can see in the XML I sent it is -1, so I don't know. I am sure it is
> supposed to be endpoint 0x83 on interface 3.
>
> Here is the summary of the first packet from SnoopUSB. This is the first
> packet that is sent when I set the GPIO from the test software:
>
> Seq Dir Endpt Time Function Data Result
> 9 out down n/a 31.341 CLASS_INTERFACE 00 01 01 00
>
> If I expand this packet in the SnoopUSB program I see this:
>
> URB Header (length: 80)
> SequenceNumber: 9
> Function: 001b (CLASS_INTERFACE)
> PipeHandle: 00000000
> SetupPacket:
> 0000: 22 09 00 02 03 00 00 00
> bmRequestType: 22
> DIR: Host-To-Device
> TYPE: Class
> RECIPIENT: Endpoint
> bRequest: 09
>
> TransferBuffer: 0x00000004 (4) length
> 0000: 00 01 01 00
>
bRequest = 9 indicates this is just a SET_CONFIGURATION request.
> There is no more information to be seen in this packet. There are four
> packets in the transaction. I assume that the following three packets are
> acknowledgement and housekeeping (they are in the XML I sent, but they
> are 'prettier' in SnoopUSB).
>
> Here are the interfaces and endpoints. First, a short program to print them:
>
> dev = usb.core.find(idVendor=0x0c76, idProduct=0x160b)
>
> for cfg in dev:
> sys.stdout.write(str(cfg.bConfigurationValue) + '\n')
> for intf in cfg:
> sys.stdout.write('\ti/f no:' + \
> str(intf.bInterfaceNumber) + \
> ',' + \
> str(intf.bAlternateSetting) + \
> '\n')
> for ep in intf:
> sys.stdout.write('\t\te/p addr:' + \
> str(hex(ep.bEndpointAddress)) + \
> '\n')
>
> Here is the output:
>
> 1
> i/f no:0,0
> i/f no:1,0
> i/f no:1,1
> e/p addr:0x1
> i/f no:2,0
> i/f no:2,1
> e/p addr:0x82
> i/f no:3,0
> e/p addr:0x83
>
>
> What should I look for/try next?
>
You have only one out endpoint, endpoint 1. It is probably this
endpoint you should write to, but before it you must select this
interface through a call to set_interface(1,1).
--
Best Regards,
Wander Lairson Costa
LCoN - Laboratório de Computação Natural - Natural Computing Laboratory
(http://www.mackenzie.com.br/lcon.html)
Programa de Pós-Graduação em Engenharia Elétrica (PPGEE)
Faculdade de Computação e Informática (FCI)
Universidade Presbiteriana Mackenzie - SP - Brazil
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