Here's what the man has to say: "Finished
writing the code for a new product, hopefully available assembled
before the end of the year. I had to write the whole firmware from start
to finish to make sure I hadn't underestimated the required resources.
Here's what the "minimal hardware to test all aspects of the firmware"
looked like. The scope probe is for measuring ISR execution time (I'm
toggling GPIOs before/after time-critical segments of code)."