nRF5340 Audio Dev Kit Output I2S to External HW Codec (MAX98357A)

RE: nRF5340 Audio Dev Kit Output I2S to External HW Codec (MAX98357A)

Elray326 — Sun, 02 Jun 2024 23:34:07 GMT

Hi Abdulmohaimen,

I apologize, I don't remember exactly how I did it, but I just published the code to my Github, you're welcome to take a look!

Best of luck,

Louie

RE: nRF5340 Audio Dev Kit Output I2S to External HW Codec (MAX98357A)

Abdulmohaimen — Mon, 19 Feb 2024 11:14:26 GMT

Hello Louie,

Could you please share the function with us? Did you only define this function in the code without removing anything else?

I appreciate your help.

Thanks in advandce

Abdulmohaimen

RE: nRF5340 Audio Dev Kit Output I2S to External HW Codec (MAX98357A)

Elfving — Wed, 19 Apr 2023 07:47:57 GMT

No problem, and glad you've gotten it to work! 🙂

Regards,

Elfving

RE: nRF5340 Audio Dev Kit Output I2S to External HW Codec (MAX98357A)

Elray326 — Tue, 18 Apr 2023 17:58:06 GMT

Hello Elfving,

I was able to successfully use the MAX98357A as an external codec for the NRF5340 Audio Dev Kit by removing any relevant code for the cs47l63, particularly by having the function cs47l63_comm_reg_conf_write() in hw_codec.c return 0. I was able to figure this out by using the debugger, setting breakpoints, and figuring out where in the code the board would fault.

I did not have to add the external hw codec to a dts overlay file, but I did follow the rest of your instructions.

Thanks for the help!

Best,

Louie

RE: nRF5340 Audio Dev Kit Output I2S to External HW Codec (MAX98357A)

Elfving — Wed, 08 Mar 2023 15:21:38 GMT

[quote user="Elray326"]

I would like to know how to connect an external HW codec. Do I need to use the P10 header? If so, how do I configure it?

[/quote]

You should add the external hw codec to a dts overlay file of the board. Also, (like what was mentioned in one of the cases you linked to) you should create an API to replace the API in hw_codec.h.

[quote user=""]

However, I do not know how to do the following instructions:

[/quote]

I'll go through the steps below:

- To do this it would be best to simply search for the terms in the project using

ctrl+shift+F in VSC. You'll find hw_codec_init() in audio_system.c. CS47L63 code can be found all over I guess.

Create a version of hw_codec_on_board_set() that sets hw_codec_sel to high, and then modify hw_codec_init to run that instead.

I do not think there are any that comes with the default audio application.

[quote user="Elray326"]is there any way to run the external HW codec at 3.3V directly from the Audio Dev Kit?[/quote]

Yeah the 5340 can provide 1.8 V to 3.3 V regulated supply for external components. See section 4.7.2 in the product spec for more info on that. Though I do not know how easy this is on the Audio DK itself. I'll have to get back to you on that, but I assume the answer is that it is impossible, and you'll have to get the 3.3 v some other way.

Regards,

Elfving

RE: nRF5340 Audio Dev Kit Output I2S to External HW Codec (MAX98357A)

Elray326 — Fri, 03 Mar 2023 20:55:14 GMT

Also, is there any way to run the external HW codec at 3.3V directly from the Audio Dev Kit?

RE: nRF5340 Audio Dev Kit Output I2S to External HW Codec (MAX98357A)

Elray326 — Thu, 02 Mar 2023 20:04:56 GMT

Hi Elfving,

I probed the 1.2v and 1.8v pins that you suggested and am seeing the proper voltages, thank you.

I would like to know how to connect an external HW codec. Do I need to use the P10 header? If so, how do I configure it?

Thank you.

Best,

Louie

RE: nRF5340 Audio Dev Kit Output I2S to External HW Codec (MAX98357A)

Elfving — Tue, 28 Feb 2023 12:11:23 GMT

Hello again,

[quote user=""]I am trying to use the I2S interface header pins (P10, specifically BCLK, FSYNC, DOUT, GND, and a power pin) on the ADK and connect them to the MAX HW codec breakout, but after probing the pins, no signal seems to be coming from them.[/quote]

Have you configured it to use this brakeout board?

[quote user=""]Only the 1v8 pin seems to be outputting 2V (why 2V?). On a separate note, can you please explain what the difference is between 1V2 and 1V8 is?[/quote]

That is odd, it should output 1.2v and 1.8v there. Are you comparing to ground? Are you powering it from USB? Have you shorted anything on it? Where exactly are you measuring?

I guess we can start with this. I see you also want more detailed instructions on how to connect an external HW codec, but we can get back to that.

Regards,

Elfving

RE: nRF5340 Audio Dev Kit Output I2S to External HW Codec (MAX98357A)

Elfving — Fri, 24 Feb 2023 14:32:34 GMT

Hello Elray,

I will have to get back to you on this next week.

Regards,

Elfving