How to read and write variables into Flash memory in STM32C092CCT6 (STM32C0 series)

[anuj18ap]

I am working with an STM32C092CCT6 (STM32C0 series) and I need help with reading and writing variables into Flash memory.

• I want to store a few configuration values (like integers or structures) that should persist after reset or power cycle.

• From what I understand, I need to erase a Flash page first and then program data at a specific address.

• I am not sure about the correct sequence for the C0 series (unlocking Flash, erasing, programming, and locking again).

• I would like to know the best practice for data alignment (word/halfword).

• Should I use HAL functions like  HAL_FLASH_Program() or is direct register access recommended for reliability?

• If anyone has a working example code snippet or reference for reading/writing user variables into Flash on STM32C0, it would be really helpful.

Thanks in advance!

[NesrynELMK]

Hello @anuj18ap ,

Please find below the steps for Flash Memory Operations:

Unlock Flash Memory:
Before performing any operation, the Flash memory must be unlocked. Use the HAL_FLASH_Unlock() function.

Erase Flash Page:
Flash memory must be erased prior to writing new data. Use the HAL_FLASHEx_Erase() function to erase a specific Flash page.

Program Flash Memory:
Write data to Flash memory using the HAL_FLASH_Program() function

Lock Flash Memory:
After completing all operations, lock the Flash memory by calling HAL_FLASH_Lock() to prevent accidental writes.

For a practical implementation, you can refer to the example FLASH_EraseProgram provided in the STM32CubeFW for the C0 series.

Kind regards,