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adjust sample length if needed for max sample rate #41

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Merged
merged 1 commit into from
Oct 3, 2018
Merged

adjust sample length if needed for max sample rate #41

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8 changes: 5 additions & 3 deletions adafruit_circuitplayground/express.py
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Original file line number Diff line number Diff line change
Expand Up @@ -562,10 +562,9 @@ def _sine_sample(length):
for i in range(length):
yield int(tone_volume * math.sin(2*math.pi*(i / length)) + shift)

def _generate_sample(self):
def _generate_sample(self, length=100):
if self._sample is not None:
return
length = 100
self._sine_wave = array.array("H", Express._sine_sample(length))
if sys.implementation.version[0] >= 3:
self._sample = audioio.AudioOut(board.SPEAKER)
Expand Down Expand Up @@ -617,7 +616,10 @@ def start_tone(self, frequency):
cpx.stop_tone()
"""
self._speaker_enable.value = True
self._generate_sample()
length = 100
if length * frequency > 350000:
length = 350000 // frequency
self._generate_sample(length)
# Start playing a tone of the specified frequency (hz).
if sys.implementation.version[0] >= 3:
self._sine_wave_sample.sample_rate = int(len(self._sine_wave) * frequency)
Expand Down