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

Make AVR Examples/Chapter13_Advanced-PWM-Tricks/adsr/generateScale.py

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+
+## File to generate equal-tempered scale for use with DDS
+
+
+import math                     # because music is math
+
+scale = ['C', 'Cx', 'D', 'Dx', 'E', 'F', 'Fx', 'G', 'Gx', 'A', 'Ax', 'B']
+
+def octave(baseLength):
+    pitches = [baseLength * math.exp(x*math.log(2)/12) for x in range(0, 12)]
+    pitches = [int(round(x)) for x in pitches]
+    return( zip(scale, pitches) )
+
+
+def writeScaleHeader(basePitch, octaves, filename="scale.h"):
+    outfile = open(filename, "w")
+    outfile.write('''/*
+
+    Scales for use with DDS synthesis.  
+
+    Aimed roughly at having A2 be at 440Hz, 
+    when the chip is clocked at 8MHz and
+    using 8-bit resolution on the PWM.
+
+    Tune it by tweaking basePitch.
+
+    */
+
+    ''')
+    for i in range(0, octaves):
+        for note, pitch in octave(basePitch * 2**i):
+            if pitch < 30000:
+                noteString = note + str(i)
+                print("#define  {:<5}{:>6}").format(noteString, pitch)
+                outfile.write("#define  {:<5}{:>6}\n".format(noteString, pitch))
+    outfile.close()
+
+######################################################################
+
+if __name__ == "__main__":
+    
+    writeScaleHeader(basePitch=130, octaves=5)
+
+