CCS/C2000WARE: Piccolo Microcontroller - Flash ECC test

Hi Bhageerathreddy,

If I understand correctly, you are able to confirm that the bit flip got introduced using the linker output.

You are wondering why the error did not get reported when you access the variable in your application - correct?  If yes, could you answer below questions to help you further on this:

1) Did you check the Flash ECC error registers after you access the corrupted variable?  And you did not see the error getting captured in the registers?

2) What is the error threshold that you are using for single bit errors (your description sounded like you introduced single bit error)?

3) Did you enable interrupt for single bit errors and defined an ISR for the same?  

Thanks and regards,

Vamsi

Hello Vamsi,

Thanks for the reply.

yes, single bit error introduced but not captured in ECC registers.

1. yes, single bit error is not captured in Flash ECC registers when i access it.

2. I selected threshold as zero, but i hope irrespective of the threshold single bit error should get captured, interrupt will not be triggered.

3. yes , i enabled the interrupt and ISR is defined.

Thanks & Regards,
Bhageerath.

Bhageerath,

Thank you for providing the details.

Is ECC enabled (please check ECC_ENABLE reigster) when you access the corrupted memory location?

How did you confirm that the single bit flip got programmed in to the Flash? Did you check it in the memory window after you load the code to Flash?

Thanks and regards,
Vamsi

Hi Vamshi,

yes, Flash ECC is enabled.

I have declared the constant variable with value as 10 and after setting the single bit flip the constant variable value has been changed( i observed on memory window also).

Thanks and Regards,
Bhageerath.

Bhageerath,

To reproduce this, can I use the project that you attached in your first post in this thread?
Did you try to insert a double bit error as well? Did that work?

Thanks and regards,
Vamsi

Hello Vamshi,

I tried both double and single bit errors. both didn't work.
yes, please use the project I attached.

Thank you.
Regards,
Bhageerath.

Bhageerath,

Do you AutoEccGeneration enabled in the Flash Plugin GUI (CCS Debug view -> Tools menu -> On-Chip Flash GUI window) when you load the code?

Thanks and regards,
Vamsi

Bhageerath,

If you have it enabled, can you disable and try? Let me know if that works.

Thanks and regards,
Vamsi

Hi Vamsi,

Sorry for the delay.
Right now I don't have the board with me to test. I will update you in a week.

Thank you.
Regards,
Bhageerath.

Bhageerath,

Did you get a chance to try with AutoEccGeneration disabled in the On-Chip Flash Plugin GUI?

Thanks and regards,
Vamsi

Bhageerath,

Since I did not hear from you in the last two weeks, I am closing this thread for now.

Please click on "Ask a related question" button at the top right corner of this page and start a new post if you have further questions related to this.

Thanks and regards,
Vamsi