Allow to skip ADC setup. #45
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E.g. for compatibility with certain libraries, or to enable techniques such as
analog port multiplexing.
Note that this is a run time solution. On the positive side, users can select to
skip ADC setup per sketch, without making any changes in the lib. On the negative side
(compared to a compile-time switch), this solution does not save any allocated RAM, and
the ISR routine is still defined on platforms that define it.
---- For some more background:
I had stumbled across this before. My present issue was that I tried to get a resistive touchscreen to work on an STM32F103C8T6, but this turned out to be impossible in conjunction with Mozzi. Use-cases like this are going to become more widespread on the more powerful platforms. But even on 8bit AVRs, there are cases, where users will need custom analogRead()s - e.g. from the PotMUX library.