> it seem like 10 times of avg reading loop of each analog input,
> taking up 30% total flash memory in 4Kword

That seems an awful lot of memory for what seems a simple function

> is there a way for optimize adc avg reading method ?

If by 'average' you mean arithmetic mean, then add the 10 samples
to a 16-bit accumulator and divide by 10. Or to simplify, take 8
and right-shift 3 times, or take 16 and right-shift 4 times. There are
also 'moving averages', where you'd re-calculate the mean after
discarding sample1 from the queue/array and adding the latest

Finding a mode might take a little more work, but you can narrow
the range to limit the number of each number and its frequency

Similarly, other methods exist when looking for other "expected"
values

http://en.wikipedia.org/wiki/Arithmetic_mean


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