OpenNuvoton/NuMaker-mbed-Audio

mbed implementation of NuMaker Audio included I2S and Codec

C++

NuMaker-mbed-Audio

This library contains Mbed implementation of NuMaker Audio I2S and Codec.

Example: Play PCM data from SD card

Declare NuSDBlockDevice and FATFileSystem.

NuSDBlockDevice bd   // device SD driver
FATFileSystem fs     // Mbed FAT file system

Declare audio.

NAU8822L audio  // NAU8822L object, I2C pinout/address and I2S pinout
or
NAU88L25 audio  // NAU88L25 object, I2C pinout/address and I2S pinout

Attach callback function for playing.
```
audio.attach(&play);
```
Start audio.
```
audio.start();
```
Stop playing.
```
audio.stop();
```
Write PCM data to audio.
```
audio.write
```

Example: Record PCM data to SD card

Attach callback function for recording.
```
audio.attach(&record);
```
Record audio.
```
audio.record();
```
Stop recording.
```
audio.stop();
```
Read PCM data from audio.
```
audio.read();
```

Notes:

Smoothly playing or recording depends on the performance of SD card.

Use FFmpeg to convert a PCM file.

ffmpeg.exe -hide_banner -i audio_file -map_metadata -1 -flags +bitexact -vn -sn -c:a pcm_s16le -ac 1 -ar 8000 -f s16le test.pcm