diff --git a/simpleio.py b/simpleio.py
index a967bc3..38f5419 100644
--- a/simpleio.py
+++ b/simpleio.py
@@ -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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