I have a HID (if it matters, a Matrix bill validator. Takes money, makes
USB signals).
The documented interface is to write 5-byte control packets to the device and
get 5-byte packets back.
On NetBSD, this is easy.
fd = open("/dev/uhid0", O_RDWR);
write(fd, packet, 5);
read(fd, packet, 5);
How do I do this on Mac OS X? The USB HID toolkit stuff doesn't seem directly
applicable; I don't need to set up event queues, I just need to poll a device
with a slightly odd interface.
I originally thought I'd be writing my own code to attach to the device, but
the HID driver attaches exclusively, so I can't attach using the more generic
USB code. That said, I would hope that the Mac OS X HID driver has this
functionality somewhere; I have a collection of weird HID devices that are
driven through weird custom messages, and I was hoping to support some of 'em
on Mac OS X.
-s
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