[Microbit-Python] Play Simple Slalom

[Damien George]

Hi Larry,

Thanks for the great feedback!  Just quickly to respond to a few points:

> Finally, it'd be deluxe to be able to upload just the text payload, rather
> than the entire firmware--that's speed things up immensely.  It looks like
> the firmware format allows specifying the offset; could we emit a
> supplemental firmware.hex that just overwrote the program text area but left
> the actual Micropython alone?

Yes, I think that would be possible.  Just make a standalone .hex with
the script.  I didn't yet try it.  The show stopper would be that if
the device erases all its flash pages before coping the .hex.  I don't
know the details of how it works to know about this point.  I guess it
just need experimenting!

BTW, you will like tools/pyboard.py: it's a script that allows to
download your own script to the microbit (from your PC) and execute
it.  Eg:

python3 ./tools/pyboard.py /dev/ttyACM0 my_microbit_program.py

Caveats:
- Since it uploads the script all at once there must be enough RAM to
hold the script *and* to compile it.  For this reason large scripts
won't work this way.
- You may need to reset the microbit (using its reset button on the
"back") between runs of pyboard.py (don't know why yet, probably due
to memory issues again).

Cheers,
Damien.