MCX MicrocontrollersのトピックRe: FRDM-MCXN947 : smartdma_camera_flexio_mculcd demo example issue : only one line on LCD

FRDM-MCXN947 : smartdma_camera_flexio_mculcd demo example issue : only one line on LCD

tgrandpi — Wed, 16 Apr 2025 10:12:48 GMT

Hello,

I successfully solder and connect my FRDM-MCXN947 to OV7670 camera and LCD PAR-LCD-S035 since I am able to run the demo "Multiple face detection on MCXN947" provided using MCUXpresso Projects from Application Code Hub.

My problem is that I encounter the following issue executing the "frdmmcxn947_smartdma_camera_flexio_mculcd example" : only one line of the camera is displayed on the top of the LCD display.

I am running the latest MCUXpresso version (24.12)

I get the "frdmmcxn947_smartdma_camera_flexio_mculcd example" directly from MCUXpresso using "Welcome"->Import SDK Examples ->Go straight to the Wizard" then frdmmcxn947 board (SDK 2.x_MCXN947/version 2.16.100/Manifest 3.14.00), then "display_examples" then "smartdma_camera_flexio_mculcd".

This project compiles, download and executes correctly but I get a black lcd screen with only one line updated by the camera.

I read the doc given on AN14191.pdf ( on https://docs.nxp.com/bundle/AN14191/page/topics/software.html#topic_30f829c2-0650-45e1-ab55-320979025292__fig_xmg_lpv_c1c" ) but that doesn't help much to understand the poorly commented code of the example.

Many thanks for your help,

Thierry

Re: FRDM-MCXN947 : smartdma_camera_flexio_mculcd demo example issue : only one line on LCD

Alice_Yang — Mon, 21 Apr 2025 02:58:45 GMT

Hello @tgrandpi

Please rework your board according to the following picture:

Alice

Re: FRDM-MCXN947 : smartdma_camera_flexio_mculcd demo example issue : only one line on LCD

tgrandpi — Mon, 21 Apr 2025 05:57:13 GMT

Thank you Alice, but I already did that 3 modifications in order to run successfully the "Multiple face detection" demo.

So this is not a hardware problem since that demo work.

Thank you for your help.

Re: FRDM-MCXN947 : smartdma_camera_flexio_mculcd demo example issue : only one line on LCD

Alice_Yang — Thu, 24 Apr 2025 04:16:07 GMT

Hello @tgrandpi

Please download the code from the AN14191 resource https://www.nxp.com/docs/en/application-note-software/AN14191SW.zip .

I've tested it on my end, it works well.

Thank you.

Alice

Re: FRDM-MCXN947 : smartdma_camera_flexio_mculcd demo example issue : only one line on LCD

tgrandpi — Mon, 28 Apr 2025 08:31:52 GMT

Dear Alice,

Thank you so much, it works now : the problem was the source code example :

I used the one provided from the MCUxpresso interface (Import SDK Examples ->Go straight to the Wizard" then frdmmcxn947 board (SDK 2.x_MCXN947/version 2.16.100/Manifest 3.14.00), then "display_examples" then "smartdma_camera_flexio_mculcd")

which is faulty.

The AN14191SW.zip is perfect ! (and totaly different).

Have a nice day !