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Update simpleio.tone to match 3.x audioio api #36

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Merged
merged 1 commit into from
Oct 2, 2018
+20 −6
Merged

Update simpleio.tone to match 3.x audioio api #36

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26 changes: 20 additions & 6 deletions simpleio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@
* Author(s): Scott Shawcroft
"""
import time
import sys
try:
import audioio
except ImportError:
Expand All @@ -45,21 +46,34 @@ def tone(pin, frequency, duration=1, length=100):
:param int length: Variable size buffer (optional)
:param int duration: Duration of tone in seconds (optional)
"""
if length * frequency > 350000:
length = 350000 // frequency
try:
# pin with PWM
with pulseio.PWMOut(pin, frequency=int(frequency), variable_frequency=False) as pwm:
pwm.duty_cycle = 0x8000
time.sleep(duration)
except ValueError:
# pin without PWM
sample_length = length
square_wave = array.array("H", [0] * sample_length)
for i in range(sample_length / 2):
square_wave[i] = 0xFFFF
sample_tone = audioio.AudioOut(pin, square_wave)
sample_tone.frequency = int(len(square_wave) * frequency)
if not sample_tone.playing:
sample_tone.play(loop=True)
time.sleep(duration)
sample_tone.stop()
if sys.implementation.version[0] >= 3:
square_wave_sample = audioio.RawSample(square_wave)
square_wave_sample.sample_rate = int(len(square_wave) * frequency)
with audioio.AudioOut(pin) as dac:
if not dac.playing:
dac.play(square_wave_sample, loop=True)
time.sleep(duration)
dac.stop()
else:
sample_tone = audioio.AudioOut(pin, square_wave)
sample_tone.frequency = int(len(square_wave) * frequency)
if not sample_tone.playing:
sample_tone.play(loop=True)
time.sleep(duration)
sample_tone.stop()



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