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Sat Nov 9 09:59:54 EST 2019

Abstract DHT11 driver

So I wrote it out completely.  Some notes:

- This can be done as inline functions, where the "host" is supposed
  to implement basic functionality.

- A single start function + single event hander seems to make most
  sense.  This is also the structure that is used in Erlang.

- The ping-pong between state machine and host consists of two kinds
  of functions:

  - Simple library functions that perform uC state change and readout,
    e.g. get/set a pin, read a timer, start a timer.

  - Some of these are expected to produce events, that will then be
    passed on to the abstract event handler.



EDIT: Now this is a "sequential" event handling state machine, i.e. it
knows exactly what the next resume point is at the time of yielding,
so it can be represented in sequential, blocking form and
auto-generated from such form.





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