nRF5340 I2S microphone in Zephyr

RE: nRF5340 I2S microphone in Zephyr

Johnny Nguyen — Wed, 08 Nov 2023 16:19:54 GMT

I see.

I would advise starting a separate ticket on this and provide your NCS version and hardware when you do.

RE: nRF5340 I2S microphone in Zephyr

Lokesh Mahajan — Wed, 08 Nov 2023 06:41:07 GMT

I am try with this example as well but get this output in log console.

[00:00:00.282,897] <err> os: Data Access Violation
[00:00:00.282,897] <err> os: MMFAR Address: 0x0
[00:00:00.282,928] <err> os: r0/a1: 0x20000220 r1/a2: 0x20003b40 r2/a3: 0x20002880
[00:00:00.282,928] <err> os: r3/a4: 0x00000000 r12/ip: 0x0000000e r14/lr: 0x000006ed
[00:00:00.282,958] <err> os: xpsr: 0x01000000
[00:00:00.282,989] <err> os: Faulting instruction address (r15/pc): 0x0000cff4
[00:00:00.283,020] <err> os: >>> ZEPHYR FATAL ERROR 19: Unknown error on CPU 0
[00:00:00.283,050] <err> os: Current thread: 0x20000870 (main)
[00:00:00.540,985] <err> fatal_error: Resetting system

RE: nRF5340 I2S microphone in Zephyr

Johnny Nguyen — Tue, 07 Nov 2023 18:15:31 GMT

Does this help?

zephyr/samples/drivers/audio/dmic at main · zephyrproject-rtos/zephyr (github.com)

RE: nRF5340 I2S microphone in Zephyr

Lokesh Mahajan — Tue, 07 Nov 2023 07:14:51 GMT

Can you give me the idea how can you use the pdm instead of the i2s

RE: nRF5340 I2S microphone in Zephyr

leadrover — Tue, 17 Oct 2023 02:25:06 GMT

I used a PDM microphone instead of the I2S interface.

RE: nRF5340 I2S microphone in Zephyr

Lokesh Mahajan — Fri, 13 Oct 2023 04:44:12 GMT

Thanks for your reply leadrover Can you just give me idea which different interface you use to solve the problem, Because I can't able to find the solution for doing that.

RE: nRF5340 I2S microphone in Zephyr

leadrover — Thu, 12 Oct 2023 18:15:17 GMT

G'day Lakesh,
I did try to update the block count to be a multiple of the slab align value, but this did not resolve the issues I was having. I've also tried reducing the block size while increasing the block counts but this didn't work either. Unfortunately I've not had the time I was hoping to have to just dive into this issue. I've switched to a different interface for what we needed and it just worked.

I'm open to other suggestions on how to fix this, but so far this still doesn't work.

Cheers,

RE: nRF5340 I2S microphone in Zephyr

Lokesh Mahajan — Thu, 12 Oct 2023 10:57:35 GMT

Hello,

I am getting the same issue for my code. Are you able to solve the problem, If yes can you please share the solution.

RE: nRF5340 I2S microphone in Zephyr

Maria Gilje — Mon, 04 Sep 2023 11:03:14 GMT

Hello,

Welcome back!

Let me know if the update works.

Best regards,

Maria

RE: nRF5340 I2S microphone in Zephyr

leadrover — Wed, 30 Aug 2023 16:48:01 GMT

Thanks Maria! Sorry for the delayed response I've been out of office. I'll update my code and see if that resolves the issues.

RE: nRF5340 I2S microphone in Zephyr

Maria Gilje — Thu, 17 Aug 2023 11:37:39 GMT

Hello.

Thank you for your patience.

[quote user="leadrover"]I've already got a block size of 35280 bytes, across 5 blocks.[/quote]

According to the documentation for K_MEM_SLAB_DEFINE_STATIC, the block number (slab_num_blocks) needs to be a multiple of the memory slab's buffer (slab_align) to. In your code I can see that slab_num_blocks = 5 and slab_align = 4.
If you need the boundary alignment, you need to make sure that the block count is a multiple of slab_align.

Best regards,

Maria

RE: nRF5340 I2S microphone in Zephyr

leadrover — Fri, 04 Aug 2023 14:58:24 GMT

Thanks for the suggestions Susheel,
I've already got a block size of 35280 bytes, across 5 blocks. At this point it's impractical for my application to have anything larger when I can use the PDM with significantly smaller blocks. I do want to understand why this isn't working though.
Do you have any additional suggestions into why I'm getting this error? I understand the stack size is not directly related, I was doing that just in-case there was a temporary buffer for handling the allocations that was being thrown on the stack during the process.

RE: nRF5340 I2S microphone in Zephyr

Susheel Nuguru — Fri, 04 Aug 2023 11:20:59 GMT

Hi Trevor,

[quote user=""]However, after the first memory block is filled (35280 bytes) the I2S clocks stop and I don't get any more data. I do get IO errors, or failed to allocate next RX Buffer: -ENOMEM errors. I've tried to bump the thread memory, main processor memory, stack size for the thread but I'm missing something.[/quote]

The unavailability of TX buffers have nothing to do with the Thread stack size. You need to increase the BLOCK_COUNT and probably BLOCK_SIZE to fit more_in_count/bigger incoming RX data while defining your mem_slab.