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DreamOnDirac
Associate III
September 18, 2023
Solved

Forcing a FLASH ECC error on a STM32G4

  • September 18, 2023
  • 3 replies
  • 2110 views

Hi

Earlier today I was demonstrating a IAP functionallity with dualbanking on a stm32G474RET. I was saying that it cannot fail as I check the written image with a CRC after it has been written to the new bank.

As I power of the system mid transfer and power it up again, I experience the what we now all expect. It obviously failed.

My system no longer boots normally and as i start to debug it i see that i get a NMI. Now, I unfortunately did not record all the relevant register values, but i am pretty sure that what was set was FLASH_ECCR, bit ECCD. I know this because i see that the NMI trigger as i am doing a boot blank check and CRC on both my banks and the NMI triggers while i am reading from the bank i was writing to.

I have now written a suitable NMI handler to deal with this situation in the future, but how can I intentionally force a double ECC error in a given address in flash?

Best regards

Martin

 

 

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3 replies

TDK
TDKBest answer
September 18, 2023

Some discussion and good ideas here:

https://community.st.com/t5/stm32-mcus-products/stm32l476-how-can-i-create-an-ecc-error-to-test-my-error/td-p/396688

 

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DreamOnDiracAuthor
Associate III
September 26, 2023

Hi TDK and thanks for the suggestion.

I ended up doing the same thing as that thread suggested. After around 60 attempts cut power while programming the flash, the error triggered.

I got "lucky" after that and the next time i needed to trigger it it took only 27 attempts.

 

// Martin

TDK
TDK
September 26, 2023

Haha, well thanks for reporting back. Good to know it works even if it's a bit time consuming to test. Wonder if it's a timing thing, where if you cut power at the exact same time relative to programming, it would happen every time. Just guessing.

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