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Added tone() #12

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Merged
merged 1 commit into from
Aug 9, 2017
Merged

Added tone() #12

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29 changes: 28 additions & 1 deletion simpleio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,12 +25,39 @@

The `simpleio` module contains classes to provide simple access to IO.
"""

import audioio
import array
import digitalio
import pulseio
import math
import time

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

:param ~microcontroller.Pin Pin: Pin on which to output the tone
:param int frequency: Frequency of tone in Hz
: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 ValueError:
with pulseio.PWMOut(pin, frequency = frequency, variable_frequency = False) as pwm:
pwm.duty_cycle = 0x8000
time.sleep(duration)

def shift_in(dataPin, clock, msb_first=True):
"""
Shifts in a byte of data one bit at a time. Starts from either the LSB or
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