Vertical scrolling Issue on LCD, source is Camera interfaced with DCMI interface.

Uc.2361 · ‎2019-12-04

I have an issue with the vertical scrolling on the LCD. The video is not being stable on the screen. LCD resolution is 480*272.

Camera Decoder used ADV7180.

Source is from Camera which is interfaced with DCMI interface.

I have attached the Video , Please point me where exactly I am going wrong.

Tesla DeLorean · ‎2019-12-05

Can't watch the video from device I'm using but would guess a disparity in the line totals or synchronization.

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Uc.2361 · ‎2019-12-06

Thank you for the quick response but I have checked the DCMI configurations and even configurations of the decoder. But not finding any clue where its going wrong.

After adjusting crop settings, now its scrolling down slowly.

waclawek.jan · ‎2019-12-06

VSYNC not connected or pin misconfigured in GPIO?

Measure waveform directly on VSYNC input pin of mcu (touching physically the pin itself - I am aiming at bad solder joints); read out and check content of respective GPIO pin.

I don't use DCMI so don't know how exactly it detects the syncs, if it's not edge- but level-sensitive, then maybe also VSYNC polarity is incorrectly set.

JW