SPI slave master DMA 4Mhz not working

[aabba.1]

Hi,
I am using a STM32H5 as SPI slave DMA (the main clock is at 250Mhz and SPI clock is at 160Mhz)... I am trying to receive data (2072 Bytes) from a master with a clock of 4Mhz and I am having some OVVERUN is this normal. When the master clock is at 2Mhz I don't have any issue.

 

Thank you

[Imen.D]

Hello @aabba.1 

Did you check the Datasheet on SPI characteristics and tips of maximum clock frequency?

SPI maximum clock frequency for STM32H5 MCUs devic... - STMicroelectronics Community

[aabba.1]

sorry did want to approuve as the best solution not sure how to revert back

[Andrew Neil]

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@aabba.1 wrote:

sorry did want to approve as the best solution not sure how to revert 

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Instructions here: 

https://community.st.com/t5/community-guidelines/help-others-to-solve-their-issues/ta-p/575256

[TDK]

No it's not normal. The DMA can easily keep up at a 4 MHz clock speed. Probably a code bug.

[aabba.1]

I am using it with some other task FreeRtos... Do you have any idea what can be the problem?

Thank you

[TDK]

Yeah, a code bug. If you showed your code, maybe something more precise could be said. Guessing at problems is not useful. Be objective, debug the code.