topic Re: I2S secondary channel support in LPC Microcontrollers

I2S secondary channel support

PatrickLai — Fri, 06 Mar 2026 02:30:56 GMT

Hi,

I'm using I2S to receive 6 channel audio data on LPC55S28. After setting FSL_FEATURE_I2S_SUPPORT_SECONDARY_CHANNEL to 1, I got the compile error: "drivers/fsl_i2s.h:424:9: error: 'I2S_Type' has no member named 'SECCHANNEL'". The SDK version is MCUXpressoIDE_24.12.148. Please help to check if it supports the I2S secondary channel feature or how to support it.

Best regards,

Patrick

Re: I2S secondary channel support

Alice_Yang — Fri, 06 Mar 2026 08:48:15 GMT

Hello @PatrickLai

The LPC55S28 does not support the I2S Secondary Channel (SECCHANNEL) feature.
There is no SECCHANNEL register in the LPC55S28 I2S peripheral module.
If you need to use multiple I2S channels on the LPC55S28, please use multiple I2S modules combined with TDM mode.
For details, please refer to Section 35.6.1 — I2S Signal Sharing in the LPC55S28 User Manual.

Hope it helps.

Thank you.

Alice

Re: I2S secondary channel support

PatrickLai — Mon, 09 Mar 2026 01:45:57 GMT

Hi Alice,

Thank you for your reply. Could you please also guide me how to find the lpc55s28 user manual? The one I found in the community seems not containing "Section 35.6.1 — I2S Signal Sharing".

Best regards,

Patrick

Re: I2S secondary channel support

Alice_Yang — Tue, 10 Mar 2026 02:10:11 GMT

Hello @PatrickLai

Please download the LPC55S28 User Manual from: https://www.nxp.com/webapp/Download?colCode=UM11126
You can find all materials related to NXP products on the NXP website: https://www.nxp.com/

If you cannot find the information you need, please feel free to contact us without any hesitate.

Thank you.

Alice