Available pins on the camera header when using LCD header - FRDM-MCXN947

cyberhelmer — Mon, 20 Oct 2025 06:57:21 GMT

I'm trying to figure out if the pins on the camera header (J9) can be used as GPIOs while also using the LCD header (J8) is used with the LCD-PAR-S035 display using smartdma or are they conflicting?

They don't show up as a conflict in config tools but I still do not seem to be able to read correctly when set as GPIO.

Can someone confirm (J9)pins can not be used as GPIOs simultaneously?

Thanks

Re: Available pins on the camera header when using LCD header - FRDM-MCXN947

Celeste_Liu — Tue, 21 Oct 2025 03:50:42 GMT

Hello @cyberhelmer ,

Thanks for your post.

I think you can refer to the user manual of frdm-mcxn947. It lists all the potential conflict for FlexIO and camera header.

Pins on J9 can technically be configured as GPIOs. However, if SmartDMA is actively using FlexIO for LCD, and J9 pins are shared with FlexIO or other active peripherals, then GPIO reads may fail due to bus contention or pin mux conflicts.

I recommend you check the pinmux in your project configuration, ensure J9 pins are not simultaneously assigned to FlexIO, CAN, I3C, or Ethernet. Also review and adjust solder jumpers if needed. You may disable SmartDMA temporarily and test GPIO reads from J9 to confirm they work independently.

Hope it helps.

Celeste

MCX MicrocontrollersのトピックAvailable pins on the camera header when using LCD header - FRDM-MCXN947

Available pins on the camera header when using LCD header - FRDM-MCXN947

Re: Available pins on the camera header when using LCD header - FRDM-MCXN947