Need fastest possible LVGL graphics VGLite or PXP on iMX RT1176?

[application_ninja]

I'm looking to achieve the fastest possible graphics, i.e. scrolling, animations, etc... on the iMX RT1176, running in landscape 720x1280. What settings / example LVGL demo could I reference? Right now I'm using the MIMXRT1170-EVKB and RK055HDMIPI4MA0 5.5" inch screen.

Also using FreeRTOS, not bare metal...

Thank you,

Scott

[jingpan]

Hi @application_ninja ,

Please use GUI Guider. It's base on LVGL and is optimized for RT1176 and PXP.

https://www.nxp.com/design/software/development-software/gui-guider:GUI-GUIDER

Regards,

Jing 

[application_ninja]

I have tried GUI Guider and the results are still slow, this is why I am asking what are the optimal settings that can be used to achieve the best results? I would think a dual core 1Ghz processor should produce lighting fast graphics, but that's just not the case. Running the example "benchmark" LVGL programs result in less than 15fps, is this normal / expected?

[jingpan · Accepted solution]

Hi @application_ninja ,

The original example report 20FPS on my board. If you set compile optimization level to -O2, it will be 34FPS. 

The example use VGLite to off-load CPU work load. If you set  LV_USE_GPU_NXP_VG_LITE to 0, the weighted FPS is 24. And if you set compile optimization to -O2, it will be 47FPS.

Regards,

Jing

[burhanhagi]

Hi @jingpan, @application_ninja 

I am working on a LVGL to understand if I can use it in my project. That is why, I am using SDK examples and GUI Guider. 

I have both MIMXRT1166 and MIMXRT1170 EVK Board. I run all examples in SDK and over GUI Guider directly. I especially focused on ScreenTransition Example in GUI Guider v1.9.0. 

Till now, I tried many many possible scenarios to reach FPS values greater than 25-30FPS. However, I could not see it even though I enable GPU, which is VG-Lite or PXP or both of that.

I experienced running UI just with CPU is working much better than enabling & using VGLite or PXP.  If CPU usage were too low levels, I will continue to my workings with only using CPU. However CPU usage for ScreenTransition Example in Gui Guider reaches over %90. So when my BSP involving later, I could not run and manage my project. That is why I focused to use VGLite. But surprisingly, using VGlite does not work at all. Just dropped CPU usage %70 levels but cause FPS values to 6-7 fps levels. 

While I searching what else I can do more to improve UI Fps performance, I found your ticket. You mentioned that you reached 47fps levels on a 720 x 1280  display panel. So your experience is the exact my focus subject. As you read in below link, I tried many things but not close to 30fps or even 20-25 fps values at an acceptable CPU consuming usage. So, I really need your help how you obtained to reach 47fps levels? 

I also opened a ticket for finding solution of the problem to GUI Guider side. Here is the link. You can read all the details what I have done so far to improve performance of LVGL UI. https://community.nxp.com/t5/GUI-Guider/LVGL-Demo-Example-Working-too-slowly-problem/td-p/2164492 

Waiting your comments. Thanks in advance

[application_ninja]

-O2 does help, but still not the performance I'd expect from this device.