Started following some tutorial on att85 usi. Downloaded example code from make avr book.

Make AVR Examples/Chapter09_Introduction-to-Timer-Counter-Hardware/amRadio/scale16.h

@@ -0,0 +1,78 @@
+/* Scale in the key of 1/10000 */
+
+/* 
+   These are periods -- if you delay this long, 
+   then toggle the speaker pin, you'll get approximate
+   pitches.  
+
+   This is the 16-bit version.  The pitches get less accurate
+   as they get higher, but not as bad as the 8-bit one.
+   
+   "x" denotes sharp.
+   
+   Can be generated by Python:
+
+   import math
+   scale = ['C', 'Cx', 'D', 'Dx', 'E', 'F', 'Fx', 'G', 'Gx', 'A', 'Ax', 'B']
+   
+   def octave(baseLength):
+       periods = [baseLength / math.exp(x*math.log(2)/12) for x in range(0, 12)]
+       periods = [int(round(x)) for x in periods]
+       return( zip(scale, periods) )
+
+   for i in range(0,4):
+       for note, period in octave(10000 / 2**i):
+           if period < 65500:
+	       noteString = note + str(i)
+	       print "#define  {:<5}{:>6}".format(noteString, period)
+*/
+
+
+#define  C0    10000
+#define  Cx0    9439
+#define  D0     8909
+#define  Dx0    8409
+#define  E0     7937
+#define  F0     7492
+#define  Fx0    7071
+#define  G0     6674
+#define  Gx0    6300
+#define  A0     5946
+#define  Ax0    5612
+#define  B0     5297
+#define  C1     5000
+#define  Cx1    4719
+#define  D1     4454
+#define  Dx1    4204
+#define  E1     3969
+#define  F1     3746
+#define  Fx1    3536
+#define  G1     3337
+#define  Gx1    3150
+#define  A1     2973
+#define  Ax1    2806
+#define  B1     2649
+#define  C2     2500
+#define  Cx2    2360
+#define  D2     2227
+#define  Dx2    2102
+#define  E2     1984
+#define  F2     1873
+#define  Fx2    1768
+#define  G2     1669
+#define  Gx2    1575
+#define  A2     1487
+#define  Ax2    1403
+#define  B2     1324
+#define  C3     1250
+#define  Cx3    1180
+#define  D3     1114
+#define  Dx3    1051
+#define  E3      992
+#define  F3      936
+#define  Fx3     884
+#define  G3      834
+#define  Gx3     787
+#define  A3      743
+#define  Ax3     702
+#define  B3      662