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Author SHA1 Message Date
Andrew Gillham
d7c1bf52a8 Add 2MHz and 4MHz sample rate support. 
Use unrolled loops to sample at 2MHz & 4MHz rates.  Based on some
testing by Bob Davis (http://bobdavis321.blogspot.com)
The maximum with a 16MHz clock is 5.3333MHz (3 cycles per sample) but
sampling at that rate isn't very accurate.  Accuracy is pretty good at
2MHz & 4MHz.
 2013-08-03 12:33:23 -07:00