Reading into a bytearray will truncate values to 0xff so the assertions
checking read_timed() would previously always succeed.
Thanks to @peterhinch for finding this problem and providing the solution.
In tests/pyb is now a suite of tests that tests the pyb module on the
pyboard. They include expected output files because we can't run
CPython on the pyboard to compare against.
run-tests script has now been updated to allow pyboard tests to be run.
Just pass the option --pyboard. This runs all basic, float and pyb
tests. Note that float/math-fun.py currently fails because not all math
functions are implemented in stmhal/.
Damien George