8000 Changes to the tone function by brentru · Pull Request #24 · adafruit/Adafruit_CircuitPython_SimpleIO · GitHub
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Changes to the tone function #24

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Merged
merged 9 commits into from
Jan 5, 2018
Merged

Changes to the tone function #24

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3db2fc6
Changes to the tone function:
Jan 5, 2018
6667bb6
linted and added example
Jan 5, 2018
36086a9
Changes to the tone function:
Jan 5, 2018
4b50353
Merge branch 'tone-fixes' of https://github.com/brentru/Adafruit_Circ…
Jan 5, 2018
3ee8aa1
fixed tone demo
Jan 5, 2018
b2569e6
demo moved
Jan 5, 2018
edd00ba
Changes to the tone function:
Jan 5, 2018
860ee15
Merge branch 'tone-fixes' of https://github.com/brentru/Adafruit_Circ…
Jan 5, 2018
767e7c5
saving some memory
Jan 5, 2018
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15 changes: 15 additions & 0 deletions examples/tone_demo.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
"""
'tone_demo.py'.

=================================================
a short piezo song using tone()
"""
import time
import board
import simpleio


while True:
for f in (262, 294, 330, 349, 392, 440, 494, 523):
simpleio.tone(board.A0, f, 0.25)
time.sleep(1)
35 changes: 18 additions & 17 deletions simpleio.py
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Expand Up @@ -34,31 +34,32 @@
import digitalio
import pulseio

def tone(pin, frequency, duration=1):
def tone(pin, frequency, duration=1, length=100):
"""
Generates a square wave of the specified frequency (50% duty cycle)
on a pin
Generates a square wave of the specified frequency on a pin

:param ~microcontroller.Pin Pin: Pin on which to output the tone
:param int frequency: Frequency of tone in Hz
:param float frequency: Frequency of tone in Hz
:param int length: Variable size buffer (optional)
:param int duration: Duration of tone in seconds (optional)
"""
try:
length = 4000 // frequency
square_wave = array.array("H", [0] * length)
for i in range(length):
if i < length / 2:
square_wave.append(0xFFFF)
else:
square_wave.append(0x00)
with audioio.AudioOut(pin, square_wave) as waveform:
waveform.play(loop=True)
time.sleep(duration)
waveform.stop()
except (NameError, ValueError):
with pulseio.PWMOut(pin, frequency=frequency, variable_frequency=False) as pwm:
with pulseio.PWMOut(pin, frequency=int(frequency), variable_frequency=False) as pwm:
pwm.duty_cycle = 0x8000
time.sleep(duration)
except ValueError:
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()



def bitWrite(x, n, b): #pylint: disable-msg=invalid-name
"""
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