[libhid-discuss] HID_Interrupt_write reports OK, but no action on device..

[Neil Sutton]

> Thanks for the advice Wingnut I will try out USBSnoop when I get home
tonight..

On Tue, Sep 1, 2009 at 12:02 AM, Charles Lepple <clepple at ghz.cc> wrote:


> On Aug 31, 2009, at 4:24 PM, Neil Sutton wrote:
>
>  In Windows I successfully control the device using VB and issue the
>> commands to control the relays using Convert.ToByte(Int)
>> The board has 4 relays and by issuing Convert.ToByte(6) for example I can
>> open a single relay, Convert.ToByte(5) closes the relay.
>> (7) and (8) control another relay.. you get the idea.
>>
>
> In that case, you probably want to send 6 and 5, or 7 and 8.
>
> Would just sending 0x35 via libhid be the equivilent of using .net's
Convert.ToByte(5) ?
> I have really confused myself with how the data should be presented to
libhid..

>
>  Now the example code reports back ok when I issue the interrupt write but
>> nothing happens on the device.
>> I think I may be sending the wrong commands but I'm not too sure..
>>
>
> Are you sure that the Windows code is using an interrupt write, and not a
> control transfer? Is it using an output usage rather than a feature usage?
>
> Also, what timeout are you using under Windows?
>
> Looking at the code I'm using for Windows (sample code .net from Lake View
Research - www.lvr.com) It does appear to be using a control transfer.
> I'm not sure about output / feature usage.. as that was something I never
dealt with using the LVR code, I just had to point it at the VID/PID and
enter the data to send.
> I did intially use the output report method in libhid but I wasn't sure of
the output path since I couldn't make much sense of the comments in the
example.
> Then I noticed that the output of lsusb said the method was Interrupt so I
presumed I should be using that..?

>
>  I figured that I should send one byte, of 8 bits..? so I have tried to
>> send 0xFF and also 255 but neither does anything.
>>
>
> 0xff and 255 get converted to the same 8-bit quantity when sent.
>
>  The lsusb output is here for my device;
>> http://pastebin.com/m48287552
>>
>> Here is the modified hid_test.c that I'm currently using;
>> http://pastebin.com/d1a6f40da
>>
>> Any pointers would be appreciated!
>>
>> Thanks
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>> libhid-discuss at lists.alioth.debian.org
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>
>
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