[Errno 5] Input/output error with Skywriter HAT

@cah wrote:

The skywriter HAT was working a couple of weeks ago (Pi 3 Jessie patched up to date as of about middle of May), but in the meantime something awry as happened.

pi@raspberrypi:~/git/skywriter-hat/python/examples $ sudo ./test.py 
Traceback (most recent call last):
  File "./test.py", line 2, in <module>
    import skywriter
  File "/usr/local/lib/python2.7/dist-packages/skywriter.py", line 488, in <module>
    i2c.write_i2c_block_data(SW_ADDR, 0xa1, [0b00000000, 0b00011111, 0b00000000, 0b00011111])
IOError: [Errno 5] Input/output error
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/usr/local/lib/python2.7/dist-packages/skywriter.py", line 479, in _exit
    stop_poll()
TypeError: 'NoneType' object is not callable
Error in sys.exitfunc:
Traceback (most recent call last):
  File "/usr/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/usr/local/lib/python2.7/dist-packages/skywriter.py", line 479, in _exit
    stop_poll()
TypeError: 'NoneType' object is not callable

And i2cdetect isn't helpful:

pi@raspberrypi:~/git/skywriter-hat/python/examples $ sudo i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

I've tried the HAT with several different SD cards (with various combinations of updates).

Is this software or hardware? The HAT looks ok ...

Thanks.

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