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  • Case ID: 322492
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Integration of PDM microphone with thingy53

Rakshita

I want to integrate the PDM microphone with thingy53, I found no particular sample code for it

Would be needing help from scratch

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  • 0

    Hi Rakshita

    Have you tested the DMIC sample in the SDK?

    It is not officially supported on the Thingy53, but it does support the nRF5340DK. If you copy and rename the nrf5340dk_nrf5340_cpuapp.overlay file to thingy53_nrf5340_cpuapp.overlay, and change the pins as necessary, I would expect the example to work on the thingy as well. 

    Not sure what you mean about repeating output? If I understand you correctly the clock output from the nRF53 is fine, but the data from the microphone seems wrong? Would you be able to attach a trace/scope capture? 

    Best regards
    Torbjørn

  • 0 in reply to ovrebekk

    dmic is not working with thingy53 even after changing the overlay files 

  • 0 in reply to Rakshita

    Hi Rakshita

    Sure, please share your code. I will take a look at that before attempting to create a new example. 

    Best regards
    Torbjørn

  • 0 in reply to Rakshita

    I went through the snoring example and added the necessary files into my code so right now getting the attached below result

  • 0 in reply to Rakshita 

    [00:00:03.110,351] <inf> NRFX_PDM: Function: nrfx_pdm_start, error code: NRFX_SUCCESS.
TRUE 
  17,    b,    7,    b,   14, ffe9,   2c,    6, 
ffc0,    8,   49,   1d,   36,   5d,    6, ffc8, 
[00:00:04.111,877] <inf> NRFX_PDM: Function: nrfx_pdm_start, error code: NRFX_SUCCESS.
TRUE 
  24,   18,    5,    1,    4,   18,   21,   1a, 
   3,    5,    3,    5,    e,   13,    a,   10, 
[00:00:05.113,494] <inf> NRFX_PDM: Function: nrfx_pdm_start, error code: NRFX_SUCCESS.
TRUE 
  53,   2a,   2e,   1d,    b, ffed, ffdd, ffd8, 
   9, fffe, fffe,    8, fffe,    9,    5, ffff, 
[00:00:06.115,020] <inf> NRFX_PDM: Function: nrfx_pdm_start, error code: NRFX_SUCCESS.
TRUE 
   b,    9,    f,   36,   4f,   44,   3b,   15, 
  1c,   1d,   14,    e,    6,    7, fffa,    2, 
[00:00:07.116,607] <inf> NRFX_PDM: Function: nrfx_pdm_start, error code: NRFX_SUCCESS.
TRUE 
ffda, ffd1, ffdd, ffb4, ff98, ffad, ffde, ffc3, 
   6,   25,   34,   21,   12, fff2, ffdb, ffcf, 
[00:00:08.118,164] <inf> NRFX_PDM: Function: nrfx_pdm_start, error code: NRFX_SUCCESS.
TRUE 
ffc0, ffd5,    3,   13,   2c,   1d,   15,   10, 
ffb6, ffa0, ffbb, ffcb, ffbc, ffc0, ffd2, ffbb, 
[00:00:09.119,750] <inf> NRFX_PDM: Function: nrfx_pdm_start, error code: NRFX_SUCCESS.
TRUE

  • 0 in reply to Rakshita

    Hi 

    Rakshita said:
    Can u tell me how to attach a zip file

    You can just drag drop a file into the reply window. Alternatively you can click on Insert -> Image/Video/File

    Rakshita said:
    I went through the snoring example and added the necessary files into my code so right now getting the attached below result

    This looks like real audio data to me, just very low amplitude. You would expect values that oscillate between positive and negative values, like in your log. 

    I also did a quick test changing my modified dmic sample to use the proper PDM pins, and I seem to get valid audio data as well (but I haven't verified this properly by playing the audio back). 

    Best regards
    Torbjørn

Reply
  • 0 in reply to Rakshita

    Hi 

    Rakshita said:
    Can u tell me how to attach a zip file

    You can just drag drop a file into the reply window. Alternatively you can click on Insert -> Image/Video/File

    Rakshita said:
    I went through the snoring example and added the necessary files into my code so right now getting the attached below result

    This looks like real audio data to me, just very low amplitude. You would expect values that oscillate between positive and negative values, like in your log. 

    I also did a quick test changing my modified dmic sample to use the proper PDM pins, and I seem to get valid audio data as well (but I haven't verified this properly by playing the audio back). 

    Best regards
    Torbjørn

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