Change constant for averaging buffer size of analog inputs

[GioCC]

Currently, two independently defined constants are used:

#define ADC_MAX_AVERAGE      8 // must be 2^n
#define ADC_MAX_AVERAGE_LOG2 3 // please calculate LOG2(ADC_MAX_AVERAGE)

These should be bound to the same value, in order to avoid accidental misalignments:

#define ADC_MAX_AVERAGE_LOG2 3
#define ADC_MAX_AVERAGE      (1 << ADC_MAX_AVERAGE_LOG2) // must be 2^n

[elral]

Great! I was always thinking the other way round, how to get the logN. But in this direction there is no preprocessor directive.

[elral]

@GioCC is it OK that I have assigned you?

[GioCC]

Sure, of course!

[elral]

@GioCC looking on your proposal, the comment // must be 2^n could be deleted. Maybe an additional comment behind #define ADC_MAX_AVERAGE_LOG2 3 might be sensefull to explain that this means an average buffer of 8 byte.