How can I get a feedback to know that the screen has been painted?

Hi

We want to get a feedback to know that the screen has been painted. We are using a custom S5D9 board with SSP1.2 and e2studio 5.3.1.

Reading the SSP Manual I have seen that it could be used the GLCDC Callbacks and the Line detection interrupt. I can guess that i have to use the event DISPLAY_EVENT_LINE_DETECTION, but I am finding a bit hard.

Can you send me an example that uses those callbacks?

Thank you for your attention.

 Amaia