TMS320F28379D: FAPI: write on the same address multiple times without erase

Adria Perez Martinez

Expert 1280 points

Part Number: TMS320F28379D

Hi,

Given the next sequence:

1. Seize FLASH pump semaphore.

2. EALLOW.

3. Fapi_initializeAPI.

4. Fapi_setActiveFlashBank.

5. Read from FLASH.

6. Erase FLASH sector.

7. Write something in FLASH sector.

8. while (Fapi_checkFsmForReady() == Fapi_Status_FsmBusy).

9. if (0 == Fapi_getFsmStatus())

10. Verify it.

11. EDIS

12. Release FLASH pump semaphore.

It works with no problem. But if I don't execute step 6, then the second time I execute the whole sequence I get an error in step 9, specifically API Fapi_getFsmStatus() returns 0x30 intead of 0. I don't know what it means.

Is it possible to rewrite on an already written address without erasing the sector? How?

Best regards,

Adria

over 6 years ago

0 Rajaravi Krishna Katta over 6 years ago

TI__Expert 6795 points

Hi Adria,

It is not possible to change the date written in the flash sector without erasing it.
You need to erase the sector before writing.

Please refer to the thread - e2e.ti.com/.../701009
for more information.

Thanks,
Katta

0 Vamsi Gudivada over 6 years ago

TI__Guru* 87155 points

Adria,

Adding to what Katta said, please note that there is a max limit on the number of erase/program cycles that you can perform on Flash. It is mentioned in "Table 5-20. Flash Parameters" of the datasheet. Please note this when you develop your application.

Thanks and regards,
Vamsi

0 Adria Perez Martinez over 6 years ago in reply to Vamsi Gudivada

Expert 1280 points

Hi Katta and Vamsi,

Thanks you both for your answers.

Best regards,

Adria

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TMS320F28379D: FAPI: write on the same address multiple times without erase