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grashnar
Visitor II
November 20, 2025
Question

STM32N6570-DK mic and screen setup

  • November 20, 2025
  • 1 reply
  • 168 views

Hi,

I'm looking for some guidance on configuring the STM32N6570-DK so i can use the screen and onboard mic / headphone out jack.

It looks like everything i need is in stm32n6570_discovery_audio.h and stm32n6570_discovery_lcd.h, and i did manage to get the screen going with some configuration from this repo: https://github.com/jpcano/STM32N6-digits 

When I then try and enable audio the following calls succeed:

void Audio_Setup(void)
{
 AudioInit.Device = AUDIO_IN_DEVICE_DIGITAL_MIC;
 AudioInit.SampleRate = AUDIO_FREQUENCY_16K;
 AudioInit.BitsPerSample = AUDIO_RESOLUTION_16B;
 AudioInit.ChannelsNbr = 1;
 AudioInit.Volume = 80;
 
 if (BSP_AUDIO_IN_Init(0, &AudioInit) != BSP_ERROR_NONE)
 {
 Error_Handler();
 }
 
 if (BSP_AUDIO_IN_Record(0, AudioBuffer, AUDIO_BUFFER_SIZE) != BSP_ERROR_NONE)
 {
 Error_Handler();
 }
}

after this the transfer callbacks never get hit and any calls to drawing the screen, HAL functions like UART sending or blinking a led also stop working.

I did try the STM32N6570-DK/Examples/MDF/MDF_AudioRecorder (no callbacks received in that) and the se example from https://github.com/STMicroelectronics/STM32N6-GettingStarted-Audio which gave garbled audio.

What steps do I need to take to setup the onboard mic properly?

Thanks

 

    This topic has been closed for replies.

    1 reply

    G
    grashnarAuthor
    Visitor II
    December 2, 2025

    Board: STM32N6570-DK
    Revision ID: Rev B
    MCU Package: https://github.com/STMicroelectronics/STM32CubeN6/releases/tag/v1.3.0

    Some more observations:

    MDF_AudioRecorder from STM32CubeN6/Projects/STM32N6570-DK/Examples/MDF/MDF_AudioRecorder

    • No audio is output from the headphone jack
    • PcmBuffer (main.c) is always 0 filled
    void HAL_MDF_AcqCpltCallback(MDF_HandleTypeDef *hmdf)
void HAL_MDF_AcqHalfCpltCallback(MDF_HandleTypeDef *hmdf)

    do get called.

    Steps to reproduce:

    1. Import MDF_AudioRecorder in STM32CubeIDE
    2. Connect headphones to headphone jack
    3. Build and run

    Expected:
    Audio passthrough from onboard digital mic to headphones

    Actual:
    No audio to headphones

    STM32N6-GettingStarted-Audio/blob/main/Projects/GS

    • Captured audio is just noise

    This uses a modified version of stm32n6570_discovery_audio.c that appears to switch the clocking which BSP expects from HSE to HSI.

    Steps to reproduce:

    1. Follow 'quickstart using prebuilt binaries'
    2. Connect headphones to headphone jack
    3. Listen and make some noise
    4. Toggle bypass

    Expected:
    Some level of mic passthrough with some level of speech enhancement applied

    Actual:
    Garbled sounds when speech enhancement is active
    Loud random noise when bypass is enabled

    BSP Direct (with and without stm32n6570_discovery_audio.c
    patches from STM32N6-GettingStarted-Audio)

    using instance 0 or 1 (sai / mdf?)

    BSP_AUDIO_IN_Init
BSP_AUDIO_IN_Record

    both return BSP_ERROR_NONE

    BSP_AUDIO_IN_HalfTransfer_CallBack
BSP_AUDIO_IN_TransferComplete_CallBack

    are called as expected. Assigned buffer is modified but contains random noise which changes every callback. This is similar to the noise from the STM32N6-GettingStarted-Audio example in bypass mode.

    Has anyone had any success capturing audio from the onboard mic on this board? Is there a minimal example anywhere of how this is supposed to work?

     

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