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MSPM0L1228: How to erase flash 8 bytes at a time?

Sho Takayama
Intellectual 360 points
Part Number: MSPM0L1228

Tool/software:

Hi,

I try to erase 8 bytes of flash at a time, but the result is that one sector (1024 bytes) is erased.

Is there anything wrong with the code?

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bool FLS_EraseOneWord(const uint32_t addr)
{
bool flashStat;
DL_FlashCTL_executeClearStatus(FLASHCTL);
DL_FlashCTL_unprotectSector(FLASHCTL, addr, DL_FLASHCTL_REGION_SELECT_MAIN);
DL_FlashCTL_eraseMemory(FLASHCTL, addr, DL_FLASHCTL_COMMAND_SIZE_ONE_WORD);
flashStat = DL_FlashCTL_waitForCmdDone(FLASHCTL);
return flashStat;
}
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Best Regards!
  • +1
    TI__Mastermind 23450 points

    Hi Sho,

    A sector is the smallest area which can be erased in MSPM0 the sector sizes are 1kB, so you won't be able to erase less than 1kB.

    If you want to give more information to the use case of the 8 bytes I might be able to offer a couple different ideas/solutions to the memory management.

    Regards,
    Luke

  • 0 in reply to Luke Ledbetter
    Intellectual 360 points

    Hi

    Thanks for your reply soon.
    I also find it in datasheet.



    Luke Ledbetter said:
    If you want to give more information to the use case of the 8 bytes I might be able to offer a couple different ideas/solutions to the memory management.

    Yes, please show me the ideas/solutions.

  • 0 in reply to Sho Takayama
    TI__Mastermind 23450 points

    Hi Sho,

    If you can spare the memory space then you can increase the usage of your memory and simply cycle the data through a whole sector. Start your address at the beginning of the sector and increment the address when you perform an update. This wastes a sector of memory but it is faster than erasing and rewriting the sector every time, this also helps with the memory endurance.

    If memory restricted, then you'll need to copy the sector into RAM, erase the sector, then write the previous data while masking the 8-bytes. You can then program your 8-bytes in afterwards.

    Regards,
    Luke

  • 0 in reply to Luke Ledbetter
    Intellectual 360 points

    Hi

    Thanks for your solution.