Fast analogRead with Arduino Due

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Since the day that I got my Arduino Due I had an idea to use it as a cheap oscillosope.
84MHz main clock was very promising but when I tried analogRead I was dissapointed to see that it needs 40uS for one conversion.

I guess It could be useful for signals up to 1kHz:

arduino due analogread

I knew there must be a better way so I went digging...

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