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JFour.6
JFour.6
Associate
February 26, 2019
Question

STM32F769I-DISC1 no speaker output via WM8994

  • February 26, 2019
  • 1 reply
  • 711 views

Hi,

I am currently developing with the STM32F769I-DISC1 development kit and get audio output via the CN7 Line Out connector when setting the initialisation to OUTPUT_DEVICE_HEADPHONE in the sample example as below:

 if(0 != audio_drv->Init(AUDIO_I2C_ADDRESS, OUTPUT_DEVICE_HEADPHONE, 40, AUDIO_FREQUENCY_22K))

 {

  Error_Handler();

 }

I need to use the speaker but get no sound out on either SPKR_L or SPKR_R when the output device is changed to either OUTPUT_DEVICE_BOTH or OUTPUT_DEVICE_SPEAKER

I have changed the unmute command from

CODEC_IO_Write(DeviceAddr, 0x36, 0x0300); to CODEC_IO_Write(DeviceAddr, 0x36, 0x0303);

as another help thread recommended but this did not help.

Please advise if there is a solution to this problem.

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    1 reply

    JFour.6
    JFour.6Author
    Associate
    February 28, 2019

    I received an answer from ST stating that the folllowing changes should be made in the MX_SAIx_Init() function according to the required channels:

    Active Slots:

    1. for headphones --> HSIx.SlotInit.SlotActive = SAI_SLOTACTIVE_0 | SAI_SLOTACTIVE_2
    2. for speaker --> HSIx.SlotInit.SlotActive = SAI_SLOTACTIVE_1 | SAI_SLOTACTIVE_3
    3. for both --> HSIx.SlotInit.SlotActive = SAI_SLOTACTIVE_0 | SAI_SLOTACTIVE_1 | SAI_SLOTACTIVE_2 | SAI_SLOTACTIVE_3

    Then you would also need to adjust the FrameLength, ActiveFrameLength and SlotNumber as follow:

    • HSIx.FrameInit.FrameLength = 64;
    • HSIx.FrameInit.ActiveFrameLength = 32;
    • HSIx.SlotInit.SlotNumber = 4;
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