[stm32f439] I have a question regarding DCMI AV camera capture with TW9912

[nanoeye2023]

The configuration and operation settings are as follows
H/W : STM32F429<====TW9912<====AV CAMERA
TW9912 is renesas video decoder

The pixel clock was confirmed to be 54mhz. Verified vsync/hsync operation.
There was no problem with the tw9912 settings.

Question 1) When I do the Hsync Line Count, line 525 is correct and
the 60hz image detect status has been displayed since the status register was read. I checked and at this time, I know it is 1440 bytes from the Line Start Code (SAV), but it becomes 1588.
I don't know why?

Question 2) Since Vsync is applied twice, I think I should use ODD field once and EVEN field once.
I try to capture it, but it doesn't reach 240 lines. The number of lines is different each time.
Please help me!!!
Thank you for reading

[KDJEM.1]

Hello @nanoeye2023  and welcome to the community 🙂,

Are you using Embedded data synchronization mode: mode1?

If yes, note that the frame structure using this mode is shown below:

but it doesn't reach 240 lines. The number of lines is different each time. 

How many lines you've reached? Are you using Image resizing feature?

Thank you

Kaouthar