About nRF5340 Audio I2S SCLK settings

[Junichi]

I want to edit the sample source (nRF5340 Audio) and program it on my own board.
The connection is CIS.
I am using NCS version 2.5.0.

I want to set the I2S clock as follows.
MCLK: 12.288MHz
BICLK: 3.072MHz
LRCK: 480kHz
Bit width: 32bit

What should I change and how?

[Junichi]

This is because I want to output a 12.288MHz MCLK to the IC on the other end of the I2S.

The IC I'm connecting to is an AK4432, and I want to output a 12.288MHz MCLK to it.

[dejans]

Hi,

I have requested more information on this internally. I expect to get back to you by the end of this week.

Best regards,
Dejan

[dejans]

Hi,

I have not got an update on this yet. I will try to provide an update during next week, but please note that it is summer vacation period and delayed replies can be expected during this period.

Best regards,
Dejan

[dejans]

Hi,

For getting exactly 12.288 MHz for MCLK you should use bypass mode which selects audio PLL as clock source. In this case MCKFREQ would be ignored.



Best regards,
Dejan