adafruit-circuitpython-nau88l21 1.0.1

Introduction

Driver library for the nuvoton NAU88L21 audio CODEC

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-nau88l21

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

sudo pip3 install adafruit-circuitpython-nau88l21

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-nau88l21

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_nau88l21

Or the following command to update an existing version:

circup update

Usage Example

import time

import audiobusio
import board
import synthio

import adafruit_nau88l21

RATE = 48000  # frame rate on the wire; also what the codec's FLL locks to

DAC_VOLUME = 0
HEADPHONE_VOLUME = 0

# MIDI note numbers for a C-major scale, C4 up to C5.
SCALE = (60, 62, 64, 65, 67, 69, 71, 72)
NOTE_SECONDS = 0.4

# CAUTION: this drives the headphone amplifier. Take the headphones off before
# the first run and confirm the level is comfortable before wearing them.

i2s = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DOUT)

synth = synthio.Synthesizer(sample_rate=RATE)

i2s.play(synth)

codec = adafruit_nau88l21.NAU88L21(board.I2C())
codec.configure_clocks()

codec.headphone_output = True
codec.dac_volume = DAC_VOLUME
codec.headphone_volume = HEADPHONE_VOLUME

print("playing scale")
try:
    while True:
        for note in SCALE:
            synth.press(note)
            time.sleep(0.25)
            synth.release(note)
            time.sleep(0.125)
finally:
    i2s.stop()
    i2s.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.