STM32H750VBT6 DCMI USART

[Shiina]

With DCMI (with DMA) and USART only 1.5FPS, why is the frame rate really low?

The output is set to QVGA and formatted as JPEG.

[Tesla DeLorean]

Probably because the bandwidth of.the UART is very low?

[Shiina]

I set the baudrate to 912600, and the camera output is JPEG, so I don't think USART is too slow.

[KDJEM.1]

Hello @Shiina ,

Which camera sensor are you using? Are you encountering the same behavior with RGB? 

Please take a look at How to improve DCMI frame rate: An example using a ov5640 camera module may help you to increase the DCMI frame rate.

Thank you.

Kaouthar

[Tesla DeLorean]

Depends on image size and efficiency. Frame rate suggests images about 60KB

[Shiina]

Thanks, I'm using ov2640, which outputs the jpeg directly.

[Shiina]

Since I set QVGA, the output jpeg size is generally 4000-5000 bytes.

[KDJEM.1]

Hello @Shiina ,

I advise you to take a look at JPEG data capture section in AN5020 may help you to check the DCMI configuration.

Do you have the same issue with a different mode and image size?

Thank you.

Kaouthar

[Shiina]

Thank you. I haven't tested anything else yet.