> TheCortex M is more like the Arduino then Pi.  The M rarely runs an
> operating system and the software burned into flash and from an end
> user's level the software never change.   You see the Arm Cortex M
> inside things like inkjet printers and microwave ovens and the like.

The librarys supplied from the manufacturers have a problem here, they assumme 
everything change dynamically while in reality it does not. Software could be 
made simpler by not using there software libraries. A good example is with 
there drivers callback functions are registered dynamically and if this is done 
once during startup software will become simpler by just adding the function 
calls to the interrupt handler, with this method it is simple to analyse what 
functions will be called.

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