RIOT/tests/driver_dac_dds

About

This is a manual test, and demo application for DAC DDS.

Usage

This application will initialize the single default DAC DDS channel, and play sine, square, sawtooth waves or a greeting audio on it as requested on the command line.

Typical usage:

> hello
> sine 440 2

Audio source and license

hello.raw is an audio rendition of ESpeak saying "hello world". It was obtained from https://commons.wikimedia.org/wiki/File:Hello_world_said_by_eSpeakNG.ogg where it is annotated to be licensed under CC-BY-SA 4.0 international.

It was converted and trimmed using:

$ fmpeg -i Hello_world_said_by_eSpeakNG.ogg -ar 8000 -f u8 -c:a pcm_u8 hello.raw
$ python3 -c "s = open('hello.raw', 'rb').read(); s = s.strip(b'\x80') + b'\x80'; open('hello.raw', 'wb').write(s)"