59 lines
2.5 KiB
Python
59 lines
2.5 KiB
Python
# Copyright (c) 2015 Adafruit Industries
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# Author: Tony DiCola
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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# Default I2C address for device.
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MAX9744_I2CADDR = 0x4B
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class MAX9744(object):
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"""Class to represent an Adafruit MAX9744 20 watt stereo amplifier with
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digital volume control.
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"""
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def __init__(self, address=MAX9744_I2CADDR, i2c=None, **kwargs):
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"""Initialize MAX9744 device on the specified I2C address and bus number.
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Address defaults to 0x4B and bus number defaults to the appropriate bus
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for the hardware.
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"""
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# Initialize I2C bus and get a reference to the MAX9744 device.
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if i2c is None:
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import Adafruit_GPIO.I2C as I2C
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i2c = I2C
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self._device = i2c.get_i2c_device(address, **kwargs)
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def set_volume(self, value):
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"""Set volume to the provided value which should be a number from 0 (muted)
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to 63 (maximum volume).
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"""
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assert value >= 0 and value <= 63, 'Volume value must be between 0 and 63 inclusive.'
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# Send the volume set command with the provided value.
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self._device.writeRaw8(value & 0b111111)
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def increase_volume(self):
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"""Increase the volume by one step."""
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# Send volume increase command: 0b11000100
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self._device.writeRaw8(0b11000100)
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def decrease_volume(self):
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"""Decrease the volume by one step."""
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# Send volume decrease command: 0b11000101
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self._device.writeRaw8(0b11000101)
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