embassy/examples/stm32wba6/README_PCM.md

SD to SAI PCM Streaming

This example streams audio from SD card to SAI using raw PCM files.

File format

Raw PCM files (.pcm) must be:

• Unsigned 16-bit little-endian
• 48 kHz
• Mono

Convert WAV to PCM

Use the Python helper:

python3 convert_wav.py input.wav output.pcm

If your WAV is not 48 kHz, resample it first (for example with ffmpeg):

ffmpeg -i input.wav -ar 48000 -ac 1 temp.wav

Then convert temp.wav to PCM with the script above.

Usage

1. Copy a .pcm or .wav file to the root of the SD card.
2. Flash and run:

cargo run --bin sdmmc_sai --release

The example plays the first .pcm or .wav file found in the SD card root.