New microphone patch

Sean McIlwain sjoemac at
Sat Dec 20 08:54:14 CET 2008

Here is an updated patch to the microphone driver.  It adds u16, s16, and s8
support.  u16 and s16 is actually 12-bit.  I also removed the arm9's
dependence upon the timers, using the fifo to signal when an acquisition
period is done.  The sound is much better!

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