STM32F746, STM32CubeIDE

[ADębs.1]

How to remember in STM32F746G-Disco uint32_t? Save after power off and recall when power is restored?

Andrzej

[Maurizio1]

Maybe you can use the SD card?

This tutorial is based on your board:

https://www.youtube.com/watch?v=I9KDN1o6924

Please use more more meaningful titles for your questions.

[TDK]

It takes some work if you want to store things on the chip itself. Dedicate a page of flash to storing user values. You must erase the entire page of flash to overwrite the values.

Otherwise use an external EEPROM/FRAM or SD card as Maurizio suggests.

[ADębs.1]

I need to save 4 bytes when power off.

Andrzej

[Maurizio1]

This is an application note describing the process of so-called "EEPROM emulation".

AN3969

[Edited to link the AN about devices that are more similar to the one used by the OP]

It does not require a SD card to be present in your system (which already has a SD drive), but it's relatively more complex to be organized, as you have to know the layout of the embedded flash memory in order to not overwrite your own code.

If you can handle that, "EEPROM emulation" is probably better for a fixed, simple data as a 4-byte unsigned integer.

[ADębs.1]

I want to write and read FLASH. Please send the sector addresses file STM32F7.

Andrzej

[ADębs.1]

When I use "HAL_FLASH_Program (FLASH_TYPEPROGRAM_WORD, FLASH_SECTOR_4, total_time);" I need to "FLASH_Erase_Sector (FLASH_SECTOR_4, FLASH_VOLTAGE_RANGE_3);" ?

Andrzej

[Maurizio1]

This YouTube tutorial should help you: STM32 FLASH Programming || SECTOR TYPE || M4, M7

[ADębs.1]

Thank you. I will write back.

Andrzej

[TDK]

See CubeMX examples for how to properly call HAL_FLASHEx_Erase and HAL_FLASH_Program.

https://github.com/STMicroelectronics/STM32CubeF7/blob/c7c5ec99c7482ea8bcdbf0a869c930af4547088f/Projects/STM32F769I_EVAL/Applications/EEPROM/EEPROM_Emulation/Src/eeprom.c

[ADębs.1]

Need:

1.after turning on the power, read the saved value from FLASH (uint32_t)

2.Unlock FLASH 2. delete the FLASH sector

3.Set the power drop interrupt in StartTask02

4. write one byte in the interrupt (uint32_t)

5.Lock FLASH

Will it work?

Andrzej

[Piranha]

Read the FLASH section in a reference manual and also the whole AN3969. Many current and future questions will be answered by that...