MCLK Frequency not available?

[PS_d]

In SDK11 through 17, MCLK is limited to 16 selections. None of which match the 256 x LRCLK or 384 x LRCLK standard. I looked at the CLOCK, thinking I could assign it as a gpio, however it appears to be limited to 32Mhz only.

Is there a way to produce a 11,2896 12,288 16,9344 or 18,432Mhz clock from the 52832?

I prefer not to have to port everything back to a pre-sdk11 version.

Thank you again everyone,

Piet

[Kenneth]

Hello,

You can find in the nRF52832 I2S specification that the maximum value for fMCK is 4MHz:
https://infocenter.nordicsemi.com/topic/ps_nrf52840/i2s.html#unique_356353441 

In your use case you may consider using the nRF5340 instead, where maximum value for fMCK is 12.288MHz:
https://infocenter.nordicsemi.com/topic/ps_nrf5340/i2s.html#unique_653264788 

The nRF5340 also have an improved I2S interface since the MCLK can be dynamically adjusted on-the-fly without stopping/starting the I2S. From the I2S peripheral description of the nRF5340:

The MCK frequency can be adjusted on-the-fly:
- For PCLK32M, by using MCKFREQ
- For ACLK, by adjusting the audio clock source, see CLOCK — Clock control.

Best regards,
Kenneth

[PS_d]

Thanks for confirming, Ken.

We forwarded the issue up the chain earlier today.

Piet