STM32L0 eeprom writting issue after a page erase

tingting · ‎2015-10-09

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.

e1369008 · ‎2015-10-09

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 · ‎2015-10-09

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 · ‎2015-10-09

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 · ‎2015-10-09

Posted on October 09, 2015 at 14:04

you're right!

Indeed ,these functions work fine!

Thank you very much.