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tingting
tingting
Associate III
October 9, 2015
Question

STM32L0 eeprom writting issue after a page erase

  • October 9, 2015
  • 4 replies
  • 855 views
Posted on October 09, 2015 at 13:14

Hi,

I cannot  write any data into the eeprom after a Erase_page.

HAL_FLASH_Program(..) and FLASH_Erase_Page(...) work fine independently. But if HAL_FLASH_Program(...) is called just after FLASH_Erase_Page(), HAL_FLASH_Program is not working. The data written are always 0x00.

Despite a 10 ms delay after the FLASH_Erase_Page, it is not working.

Thanks.
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    4 replies

    e1369008
    e1369008
    Associate
    October 9, 2015
    Posted on October 09, 2015 at 13:31

    You shouldn't just wait for x milliseconds, you should wait until the busy flag is cleared from the FLASH_SR register, then check for the error flags, if everything is OK only then process to the next operation with the EEPROM.

    What library are you using? HAL, Snippets?
    tingting
    tingtingAuthor
    Associate III
    October 9, 2015
    Posted on October 09, 2015 at 13:47

    I am using HAL library.  The HAL_FLASH_Program implements an instruction to wait for last operation to be completed.

    e1369008
    e1369008
    Associate
    October 9, 2015
    Posted on October 09, 2015 at 13:51

    Then why are you using HAL_FLASH_Program(..) and FLASH_Erase_Page(..) function to porgram the EEPROM? Shouldn't you use the EEPROM functions. I'm not using HAL but here are the functions I could find related to the EEPROM:

    HAL_FLASHEx_DATAEEPROM_Unlock

    HAL_FLASHEx_DATAEEPROM_Lock

    HAL_FLASHEx_DATAEEPROM_Erase

    HAL_FLASHEx_DATAEEPROM_Program

    ..and some others..

    tingting
    tingtingAuthor
    Associate III
    October 9, 2015
    Posted on October 09, 2015 at 14:04

    you're right!

    Indeed ,these functions work fine!

    Thank you very much.

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