STM32H750VBT6 DCMI USART
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‎2024-07-10 03:35 AM - last edited on ‎2024-07-11 02:48 AM by SofLit
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.
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STM32H7 Series
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UART-USART
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‎2024-07-10 03:57 AM
Probably because the bandwidth of.the UART is very low?
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‎2024-07-10 04:10 AM
I set the baudrate to 912600, and the camera output is JPEG, so I don't think USART is too slow.
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‎2024-07-10 05:34 AM - edited ‎2024-07-10 08:03 AM
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
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‎2024-07-10 11:22 AM
Depends on image size and efficiency. Frame rate suggests images about 60KB
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‎2024-07-10 06:56 PM
Thanks, I'm using ov2640, which outputs the jpeg directly.
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‎2024-07-10 06:57 PM
Since I set QVGA, the output jpeg size is generally 4000-5000 bytes.
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‎2024-07-11 12:31 AM
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
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‎2024-07-11 06:30 AM
Thank you. I haven't tested anything else yet.
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