SPI slave master DMA 4Mhz not working

aabba.1 · ‎2024-09-17

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 · ‎2024-09-17

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

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Thanks
Imen

TDK · ‎2024-09-17

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

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aabba.1 · ‎2024-09-17

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

aabba.1 · ‎2024-09-17

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

Thank you

Andrew Neil · ‎2024-09-17

@aabba.1 wrote:
sorry did want to approve as the best solution not sure how to revert

Instructions here:

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

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

TDK · ‎2024-09-17

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.

If you feel a post has answered your question, please click "Accept as Solution".