Merge pull request #2965 from jepler/sine-wave-examples

Various doc examples:  Fix the "/ 18" copypasta bug

Author: sommersoft

shared-bindings/audiobusio/I2SOut.c

@@ -61,7 +61,7 @@
 //|           length = 8000 // 440
 //|           sine_wave = array.array("H", [0] * length)
 //|           for i in range(length):
-//|               sine_wave[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15) + 2 ** 15)
+//|               sine_wave[i] = int(math.sin(math.pi * 2 * i / length) * (2 ** 15) + 2 ** 15)
 //|
 //|           sine_wave = audiocore.RawSample(sine_wave, sample_rate=8000)
 //|           i2s = audiobusio.I2SOut(board.D1, board.D0, board.D9)

shared-bindings/audiocore/RawSample.c

@@ -61,7 +61,7 @@
 //|           length = 8000 // 440
 //|           sine_wave = array.array("h", [0] * length)
 //|           for i in range(length):
-//|               sine_wave[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15))
+//|               sine_wave[i] = int(math.sin(math.pi * 2 * i / length) * (2 ** 15))
 //|
 //|           dac = audioio.AudioOut(board.SPEAKER)
 //|           sine_wave = audiocore.RawSample(sine_wave)

shared-bindings/audioio/AudioOut.c

@@ -61,7 +61,7 @@
 //|           length = 8000 // 440
 //|           sine_wave = array.array("H", [0] * length)
 //|           for i in range(length):
-//|               sine_wave[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15) + 2 ** 15)
+//|               sine_wave[i] = int(math.sin(math.pi * 2 * i / length) * (2 ** 15) + 2 ** 15)
 //|
 //|           dac = audioio.AudioOut(board.SPEAKER)
 //|           sine_wave = audiocore.RawSample(sine_wave, sample_rate=8000)

shared-bindings/audiopwmio/PWMAudioOut.c

@@ -63,7 +63,7 @@
 //|           length = 8000 // 440
 //|           sine_wave = array.array("H", [0] * length)
 //|           for i in range(length):
-//|               sine_wave[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15) + 2 ** 15)
+//|               sine_wave[i] = int(math.sin(math.pi * 2 * i / length) * (2 ** 15) + 2 ** 15)
 //|
 //|           dac = audiopwmio.PWMAudioOut(board.SPEAKER)
 //|           sine_wave = audiocore.RawSample(sine_wave, sample_rate=8000)