STM32F767 flash programming problem

[gsaru.1]

Hi everyone,

We are trying to program the MCU flash memory to write and save some data on it.

After successfully writing to a single sector, we can't delete the sector content anymore.

We are using HAL_FLASHEx_Erase to delete the sector.

In particular, we use the ideas in this article https://controllerstech.com/flash-programming-in-stm32/

Thanks in advance.

[Tesla DeLorean]

Are you asking a Question, or making a statement?

Well the HAL FLASH functions do work properly on the F767's, so perhaps review the Reference Manual, or looks at the examples provided in CubeF7 for the board..

[gsaru.1]

Asking a question...

Correction to the original post - after a single write(that might have failed) to a sector, when we try to write/overwrite the same sector we fail. Already read the Reference Manual (and I'm sure the HAL FLASH functions work properly), hence looking for advice on how to proceed from here/ things to think about that we might have missed.

[Javier1]

every time you want to write FLASH, the entire flash page needs to be erased.

https://community.st.com/s/question/0D53W00001hkN4aSAE/hardfault-when-i-try-to-program-in-the-flash-memory

What i usually end up doing is:

1. copy entire flash page to ram buffer
2. modify the part of the ram buffer i want
3. erase flash page
4. copy back RAM buffer into erased flash page

[Javier1]

Recomended reading RM0410

I have never used an F7, what about the single/dual bank bits?

[jbake_uni]

For dual bank information you can use this resource:

STM32F7 Series Flash memory dual bank mode, software expansion for STM32Cube (AN4826)