Re: Help needed - writing USB device driver

[Ron Gage <ron@xxxxxxxxxxx>]

Ron Gage wrote:
> Alan Stern wrote:
>   
>> Umm.  I'm not familiar with USB programming under Windows, so I can't 
>> say what (if anything) the "Function: 0019" means.  It's probably 
>> something specific to the Windows USB API and not meaningful in other 
>> operating systems.
>>
>>   
>>     
> 4    in down    n/a    2.925    VENDOR_ENDPOINT    -   
> URB Header (length: 80)
> SequenceNumber: 4
> Function: 0019 (VENDOR_ENDPOINT)

> Entirely possible.  I'll look into this further.
>
>   
The function number (0019 - Vendor Endpoint) appears to be relevant: I 
am trying to send a control message to the device and am getting back 
error -32 (EPIPE).  I'm using libusb for the comms right now.  Here is 
the snip from my code:


      handle = usb_open(dev);
      if (!handle)
        {
        printf ("Could not open device.\n");
        }
      else
        {
        char buff[128];
        printf ("Set Configuration returned 
%d\n",usb_set_configuration(handle, 1));
        printf ("Claim Interface returned %d\n",usb_claim_interface 
(handle, 0));
        while (1)
          {
          int r1,r2,x;
          char b1[4096],b2[4096];
          r1 = usb_control_msg(handle, 0,0x81,0x80,0, b1, 128,10000);
          r2 = usb_control_msg(handle, 0,0x81,0x80,0, b2, 128,10000);

Set Configuration and Claim Interface are both returning 0 here, r1 and 
r2 are both being set to -32.

>>> PipeHandle: 00000000
>>>
>>> SetupPacket:
>>> 0000: 00 81 80 00 00 00 00 00
>>>     
>>>       
Ron Gage

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