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On Aug 31, 2009, at 4:24 PM, Neil Sutton wrote:
Hi All,
I have been bashing my head against the keyboard all day trying to
make my little USB relay work under Linux (Ubuntu Jaunty if it
matters)
I don't have a great deal of experience with linux but after some
reading I discovered that the best way to talk to the relay (which
detects as a HID device) was to use the libhid library.
So far I have tweaked the example code so that it looks for my
device and set up the commands to make an interrupt write to try and
enable the relays.
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.
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?
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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