LyraTD-MSC very low volume on headphone 3.5 mm stereo jack

[rduell]

i'm using the ESP32-LYRATD-MSC board which includes the DSP ZL38063. I use a headphone with an impedance of 16ohm and no mic (only 3 poles: left/right/ground).
The headphone playback volume at its maximum of 100% is extremly low. I have tried to set the register value for controlling the DAC volume on the ZL38063 manually to a higher value (in relation to 100% of ADF control) by using a breakpoint with the jtag debugger. The sound became louder but distorted.
Do I use the wrong headphone ? or do i miss something to consider in the setup?
Thanks for your help. Ralf

[mike.tolkachev]

Hi!
I have the same problem.
My device consists of two boards.
I ran the mp3 playback example and then removed and put back the top board. After that, the sound is heard loudly. After pressing the reset button, the volume drops again.
If you immediately turn on the new board with the original firmware, then the volume is normal. I think we are missing something in the setup

[mike.tolkachev]

I found strange behaviour. If you run the example mp3 player and then disconnect and reconnect one connector between boards A and B, then the sound volume will be high. After pressing the reset button, the sound will become quiet again.
https://ibb.co/0DDnBHT

[mike.tolkachev]

I found a solution.
It's a hack but it works.

Code: Select all

// play_mp3_control_example.c ...

 ESP_LOGI(TAG, "[ 5.1 ] Start audio_pipeline");
    set_next_file_marker();
    audio_pipeline_run(pipeline);
    
    /* START SOLUTION */
    gpio_set_level(21, 1);  
    gpio_set_level(22, 0);  
    gpio_set_level(21, 0);
    gpio_set_level(22, 1);
    /* STOP SOLUTION */

    while (1) {
        audio_hal_set_volume(board_handle->audio_hal, 100);
        audio_event_iface_msg_t msg;
     

[anibal]

me paso lo mismo que sonaba bajo, desconecte la parte de arriba de la placa y conecte , repetí esto dos veces y el sonido se hizo mas fuerte