How to retain a 32bit real value on FLASH Memory in STM32L041x6

[dango.11]

Hi!

I am trying to store a real value in the flash memory of my STM32 but i am struggling to write it. Has anyone already done this in the same STM32L041x6 processor?

If so , how can i do it? also, is it possible to read it back?

Thanks in advance!!

[Tesla DeLorean]

Imagine it is just 4-bytes of data, and use pointers, casting or union/struct​

[S.Ma]

Ideally create a flash data sector in the linker config file so the address is fixed while your code grows. Use pointers as Clive mentionned.

[dango.11]

Thanks for the help! , do you know where could i find an example? I am really lost at this.

[RomainR. · Accepted solution]

Hello dango.1 (Community Member)

You can refer to the STM32Cube_FW_L0 example below:

\STM32Cube\Repository\STM32Cube_FW_L0_V1.12.1\Projects\NUCLEO-L031K6\Examples\FLASH\FLASH_EraseProgram.

It shows how to use Flash HAL function to first unlock the flash then erase a page and finally write a word.

However, you also have to check the flash erase/programming maximum cycle if it fits to your application ?

However, for user data, the STM32L041 (categorie 2) device embed 1 Kbyte of data EEPROM that is very suitable to store user data.

You can find the relative function to manage EEPROM located in stm32l0xx_hal_flash_ex.h / .c

Best regards,

Romain

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[dango.11]

Hi!

Thanks for the help!

My application is related to a brushless motor control ,i control its current and i wanted to implement a mode so i can change the intensity depending on the use but that if i turn off and on the microproccesor, that value is retained.

I will be trying the eeprom cause even though this mode will not be used many times,i don´t wanna waste the flash cycles.