Hi:
I ran into a situation with libhid where a USB product ID of 0x0501 was
matching on a USB device with a product ID of 0x0503. I narrowed it
down in hid_compare_usb_device() to the line below:
-----
((dev->descriptor.idProduct & match->product_id) == match->product_id)
-----
Tracing the values of the above, both match and dev descriptor, the
values were showing correct (0x0501, 0x0503), but still evaluating as
matched.
If I change the above code to just:
-----
(dev->descriptor.idProduct == match->product_id)
-----
Then the product ID's match correctly, and only 0x0501 matches 0x0501.
Any ideas on why 0x0503 would match 0x0501 on the original code?
Actual hex codes were set/used in the passed HIDInterfaceMatcher struct.
As a side note, the vendor ID did not experience this problem. Latest
SVN trunk (2015-04-19).
Thanks.
~ Chris
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