• State Verified Answer
  • Replies 20 replies
  • Subscribers 74 subscribers
  • Views 2517 views
  • Users 0 members are here
Attachments (0)
Nordic Case Info
  • Case ID: 325353
Options

nrf5340 usb device for audio

huma

I have found that nrf5340 support the usb device function. It can be used for sound card which can receive the audio signal from the PC, and output the mic signal to PC.

And I have tested that function from the nrf5340_audio application.

My question is if we made a USB Docking, if i plug my device which uesd nrf5340 to the docking, can output music(for example, the i2s input to the nrf5340) to the docking which can convert it to analog signal so people can hear them through the wired headset.

Because i thought that first, may be the Docking shoud support the USB HOST function, and the second question is we need the nrf5340 to output the audio signal through the USB prot, not only the MIC signal, I don not know if there some limtations in that.

Thank you very much for helping.

Parents
  • 0

    Hello,

    I am not quite sure if I understand your topology correctly - you can indeed use the microphone on the nRF5340 LE Audio DK to output audio to a connected computer over USB, but the nRF5340 LE Audio can not serve as a USB Host.
    So, you are correct that you can have your nRF5340 LE Audio DK output the music to the docking (as digital, over USB), or it could output the audio as analog audio out through the headphone jack (by sending the digital audio to the onboard Cirrus Logic hardware codec DAC/DSP).

    Please elaborate on your intentions and topology if this did not fully answer your question.

    Best regards,
    Karl

  • 0 in reply to Karl Ylvisaker

    Hello Karl,

    Thank you for your help. We plan to design an audio product with USB function and using battery. And we also want to design a docking for it, the docking can charging the device. So we need to consider whether it is possible to add a headphone jack on Docking so that users can listen to music through wired headphones. If we want to meet this requirement, we first need to evaluate whether it is possible to output music through the nrf5340 USB port.

    So, you are correct that you can have your nRF5340 LE Audio DK output the music to the docking (as digital, over USB).

    Does that means if the docking can work like PC(USB HOST), we can output the audio to it? You know, the nrf5340_audio application only can oputput the mic signal to PC. So I'm not sure if there are any limitations on USB role, such as USB devices can only being able to output MIC signal or if there are bandwidth limitations. Because we want to output the normal music signal, i think the resource requirment should be larger than mic.

    Thank you very much.

  • 0 in reply to Karl Ylvisaker

    Hello, Karl

    Thank you very much for your reply.

    In the default sample, the Windows11 can recognized it:

    Then I have tried to add the "mic-channel-c;" to the dt overlay file.

    &hs_0 {
        mic-channel-c;
    };

    Then the windows can recognized it, but there is no Advanced page to check the channel:

    And I have checked the kconfigs in the project, but i found nothing about the channel settings. Also for the audio_usb.c/.h. I know if i add the channel, the file shoud be modified. But I want the Windows 11 can get the channel of my device first, even if it doesn't work.

    Thank you very much and looking forward for your reply.

  • 0 in reply to huma

    Hello,

    Thank you for your patience with this.

    huma said:
    And I have checked the kconfigs in the project, but i found nothing about the channel settings. Also for the audio_usb.c/.h. I know if i add the channel, the file shoud be modified. But I want the Windows 11 can get the channel of my device first, even if it doesn't work.

    I am not sure that I understand what you mean by this - what changes have you currently made to the audio_usb.c/.h, and what were the specific purpose of those changes?

    Best regards,
    Karl

  • 0 in reply to Karl Ylvisaker

    Hello,  Karl

    Thank you very much for your reply.

    I have only changed the dt overlay file, because the audio_usb.c/.h i found that there is only the audio signal process part.

    What I want to test now is how many audio channels my USB device can recognized by my PC. The first step is that I don't care if the audio part is working, so I think I should first modify the device information section of the USB device.

    The second step is that once the computer can correctly recognize the number of channels for the device I want, I can start modifying the audio part.

    So, for the first step, what should i do?

    Thank you very much and looking forward for your reply.

  • 0 in reply to Karl Ylvisaker

    Hello, Karl.

    I'm sorry to bother you again, but may I ask if there is a way for my computer to recognize that my USB device(nrf5340 audio DK) has multi-channel characteristics, for example, i want to output to PC up to 4 or 6 channel mic signals, at least my PC need to recognize it has so much channel first. which is the foundation for me to continue working on it. Then i will to research how should i deal with the audio part.

    Thank you very much and looking forward for your reply.

  • 0 in reply to Karl Ylvisaker

    Hello Karl,

    I think it's best for me to open a new post to ask this question, because it wasn't the question I asked at the beginning

    the link is :(+) Does the nrf5340 audio DK can support the mutichannel USB device? - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

    And thank you very much!

Reply Children
Related
Terms of service