FUOTA: Facing issues while using flash memory instead of UnfragmentedData[FRAG_MAX_NB * FRAG_MAX_SIZE] (SRAM buffer).

[shabaz-git]

Hi,

We are using B-L072Z-LRWAN1 board to perform the FUOTA.
The way we changed the current implementation:

1. In FragDecoderWrite function in main.c we added a function to write the fragments to the flash memory.
   FlashMemHandler_Write((void *)(FLASH_BANK2_BASE + addr), (uint8_t *)UnfragmentedData, size);
2. to read the same fragmented data from flash we added below function in function FragDecoderRead:
   FlashMemHandler_Read(/*destination*/ (uint8_t *)data,/*Source addr*/ (void *)(FLASH_BANK2_BASE + addr), size);

You can get the function definitions in the attached text file. We got these things from the stm32 i-cube-lrwan example.
Our aim is to utilize the FLASH instead of the SRAM.

FlashMemHandler.txt

We are facing the problem when there is loss of fragments in function FragDecoderProcess.
And while it's trying to perform GetRow() operation while handling the lost frames, the board is going into unknown state like infinite while loop.
Can you suspect any cause for this?

[shabaz-git]

I think I was able to solve my problem. As the fragment loss handler will write to the fragment location multiple times. In this process, as it tries to write the non-zero area error is coming.

So, I am erasing the flash location before writing to that location. With this, the problem got solved.