I think I have finally figured it out. Thanks for the suggestion, I ran the
executable (compiled C code) and it worked, and it returned 0x8B.
Previously I saw this value and thought was bunkum. I thought it was incorrect
because of the way ctypes encodes a string buffer: ('value', '\x8b|'). I was
probably thrown off by the '|' in the string. Not sure why that gets
returned. I guess to get a real value out of that buffer you have to use the
're' module or something.
So I reasoned that I must be using the wrong direction. I had at that point
changed from ...HOST2DEVICE to ...DEVICE2HOST, reasoning that a read op is
going to result in data going from the device to the host. However the way I
had it before (HOST2DEVICE) was actually correct (for some reason.
Thanks,
Mark
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