Introduction

CircuitPython driver library for TI TAS2505 audio amplifier

Dependencies

This driver depends on:

• Adafruit CircuitPython

• Bus Device

• Register

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle or individual libraries can be installed using circup.

Installing from PyPI

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-tas2505

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-circuitpython-tas2505

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .venv
source .env/bin/activate
pip3 install adafruit-circuitpython-tas2505

Installing to a Connected CircuitPython Device with Circup

Make sure that you have circup installed in your Python environment. Install it with the following command if necessary:

pip3 install circup

With circup installed and your CircuitPython device connected use the following command to install:

circup install adafruit_tas2505

Or the following command to update an existing version:

circup update

Usage Example

import array
import math
import time

import audiobusio
import audiocore
import board
import digitalio

import adafruit_tas2505

RATE = 44100

DAC_VOLUME = 0  # digital, 0 to -63.5
SPEAKER_VOLUME = 0  # analog, 0 to -72.3
SPEAKER_GAIN = 6  # Class-D amplifier, 6 to 24

reset_pin = digitalio.DigitalInOut(board.TAS_RESET)
reset_pin.direction = digitalio.Direction.OUTPUT
reset_pin.value = False
time.sleep(0.01)
reset_pin.value = True
time.sleep(0.01)

dac = adafruit_tas2505.TAS2505(board.I2C())
dac.configure_clocks(sample_rate=RATE)

dac.speaker_output = True
dac.dac_volume = DAC_VOLUME
dac.speaker_volume = SPEAKER_VOLUME
dac.speaker_gain = SPEAKER_GAIN

audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DOUT)

# One cycle of a 440 Hz sine, played on a loop
length = RATE // 440
sine_wave = array.array("h", [0] * length)
for i in range(length):
    sine_wave[i] = int(math.sin(math.pi * 2 * i / length) * 0.5 * (2**15 - 1))
sine_wave_sample = audiocore.RawSample(sine_wave, sample_rate=RATE)

try:
    while True:
        audio.play(sine_wave_sample, loop=True)
        time.sleep(1)
        audio.stop()
        time.sleep(1)
finally:
    dac.speaker_output = False
    audio.stop()
    audio.deinit()
    reset_pin.deinit()

Documentation

API documentation for this library can be found on Read the Docs.

For information on building library documentation, please check out this guide.

Contributing

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.