I interfaced Camera to the STM 32f746G . i used pixelData widget to show the camera feed and created GUI above it. the problem is that i have tearing when i am using GUI on top of the pixel widget. I think its synchronization problem

[MSale]

..

[Martin KJELDSEN]

You need to sync your frames with TouchGFX. The camera is maybe producing frames at a different rate, and you could be displaying the current screen while you're transferring data from the camera to the memory area of the pixel data widget.

/Martin

[MSale]

@Martin KJELDSEN​ 

The frame rate from the camera is 30 fps. Is there an application note how to synchronize the TouchGFX rate with the camera frame rate?

[Martin KJELDSEN]

Hi @Community member​,

I'm affraid not. It's a very application specific issue. Can you confirm this is what's happening?

What you need to do is to protect the memory area defined for the pixel data widget using a semaphore unless you implement some other layer where the pixel data widget can get the next available frame (there may be multiple frames queued up). If you sync with TouchGFX your farmerate will most likely drop because the application won't run as fast as your camera is producing frames - Especially with additional gui on top.

This is where a second layer would come in handy - It's not something we support, officially, but it would be incredibly powerful to configure an additional layer to show output from a camera, and then a layer to show the TouchGFX gui application.

/Martin

[MSale]

Hi @Martin KJELDSEN​ 

Thanks for the information. i tried with the 2 layers but i have problem . when i put the camera frame buffer in layer 1 and GUI in layer 2 the camera freeze. when i change the order its working fine but the GUI widgets are very transparent. Do you think its related to external SDRAM?

Regards

Mahmoud

[MSale]

@Martin KJELDSEN​ 

The camera totally dissapear after executing touchgfx::HAL::getInstance()->taskEntry(); but this happen when the camera at 1st layer and touchgfx on second. also the live video is running well before starting the touchgx task vut once it start its gone and only the gui visible.

the frame of the camera is 261120.

i think the layer does not updating but for what reason thats i dont know yet.

the strange thing its running when i reverse the layer locations

Thanks in adcvance

Regards

Mahmoud

[MSale]

@Martin KJELDSEN​ 

Camera frame is 480*272*2 and its located at the 0xc0000000

touchgfx frame is at 0xc0400000

[MSale]

@Martin KJELDSEN​ 

Hi Martin,

I solved the problem and its working fine now bottom layer live video at 30fps without tearing and top layer the gui. thanks for your help really appreciated it.

Regards

Mahmoud

[Martin KJELDSEN]

Glad to hear that. How did you end up solving it?

/Martin

[MSale]

@Martin KJELDSEN​ 

I made touchgfx update the 2 layers instead of 1.

i have another issue which is that i want to display the live video with alpha = 255 but for the widgets its not possible because it will override the live video. is there way to not blend the whole top layer, only the widgets

[Kli.1]

can I ask how to config 2 layer LTDC by useing CUBEMX for TOUCHGFX? CUBEMX warning me touchgfx can‘t use 2 layer config