there is a delay between caling dcmi_start_dma function and data being actually received in dcmi_dr

[kanuz_khan]

there is a delay between caling dcmi_start_dma function and data being actually received in dcmi_dr in stm32l4r9discovery the pixel clock is 24 mhz 

[KDJEM.1 · Accepted solution]

Hello @kanuz_khan ,

If, I have understood your question correctly, yes I confirm, there is an delay between the dcmi_start_dma and the moment when the data are packed into a 32-bit data register (DCMI_DR). This delay depends on:

- VSYNC, HSYNC, PIXCLK

- Software optimization

- Data formats: Monochrome, RGB, YCbCr.......

- Length 

- DMA configuration

Thank you.

Kaouthar

[KDJEM.1]

Hi @kanuz_khan ,

Has your request been answered?

If you need further clarification, please do not hesitate to share it :).

Thank you.

Kaouthar.