Hi Amedes,

thanks for your spdif encoder. In itself it works great.
Unfortunately the higher I2S frequency or the added encoding burden seem to consistently break the ESP32 A2DB stream in my tests.

I'd like to ask if you experience the same issue or if I maybe doing somthing wrong?

What I did (not too much to do wrong here, I guess):

• download and install current esp32 idf (5.0)
• git clone your repo
• init the idf environment
• build, flash and monitor your code on an esp32 with a toslink transceiver at pin 27

What I get when sending sound from my phone:

• crystal clear sound via my soundcard optical in or my av receiver with its own dac for ~1-2min - hooray!
• then soft clicks every ~4-5s begin, each accompanied by one warning message "W (120735) BT_APPL: Pkt dropped" :(

I worked on this with pschatzmann, who added SPDIF to his arduino-audio-tools and I even added tasks doing the encoding and i2s writes on the other core to remove stress from the bluetooth core. But same issue, so far nothing helped.
pschatzmann/ESP32-A2DP#168,
pschatzmann/ESP32-A2DP#137

I also added an issue on the espressif idf repo, but so far no reaction.
espressif/esp-idf#8368

My current point of view is: the dropped frame in the bluetooth layer leads to an incomplete stream delivered via the bt callback to your encoder. Since this drop happens inside the closed source code, one can only influence it by changing configuration. The algorithm itself is ok, verified by encoding and sending a locally generated sine wave.

I hope you have some insights there, that might help making it work - would be awsome to get rid of the analog line from the esp to the receiver.

Regards,
Joachim

Hello, your project is the only one that i checked and can really generate audio. Do you perhaps have example on how to play mp3 from sd card?