Graphic Accelerator Example in EmWiz13

Question

Hello,

In graphics accelerator example; 

• I downloaded the latest platform package from your website regarding NXP Imxrt1170-VGLite EmWiz13. 
• I have two boards. One is NXP-Imxrt1170-EVK and another one is my custom board.

I  tested (RGBA8888 package) both boards with Graphic Accelerator example. Both gives me almost the similar output. However, while “Alpha 8 Bitmap Caption” is being displayed, my custom board and eval board gives different views. My custom board gives 12Fps Refresh Rate unlike eval board, gives 30Fps. 

See below SS. Why is it different from each other? Is there something that I missed? Thanks in advance.

https://ask.embedded-wizard.de/?qa=blob&qa_blobid=13045233422138711063

 

 

Answer 1

Hello,

it is difficult to say what is causing the differences, without knowing the schematics and all details. Typically the available memory bandwidth is different - so the data throughput to SDRAM and Flash could be different. In case the displays are different (either in resolution or in timing), the requested memory bandwidth could be different.

Please consider, that if a frame is missed, the system has to wait for the next one, e,g, if an animation takes more than 16ms, 60 FPS cannot be achieved and the result will be 30 FPS.

Best regards,

Manfred.

Comments

Hi Manfred,

Normally, I thought as you said. However, if it would indeed be reasoned form memory bandwidth, then I would have seen the same lower FPS values in other "Native Bitmap", "RGB565 Bitmap", "Rectangle Fill" captions, but I do not. Except from "Alpha 8 Bitmap", the other all bitmap animations in Graphic Accelerator example is OK. Even my board gives higher FPS output (35-40 Fps) in Rectangle Blend than Eval Board(19-20 Fps). That is why I need to ask you if there is any special consideration about Alpha8 format.

Now I understand nothing special situation exists.Thank you very much. Best regards