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WNguy.1
WNguy.1
Associate II
January 30, 2020
Solved

Help on storing live/changed data into STM32F4 board and retrieving it in it in its own code

  • January 30, 2020
  • 4 replies
  • 1405 views

Hi fellow programmers! I need assistance on where I would start in trying to flash/store live new data into an STM32 micro controller and then retrieving it to use again in the case that it resets or turns Off/On.

Any key words or directions would be greatly appreciated!

This topic has been closed for replies.
Best answer by Andrew Neil

"I need assistance on where I would start"

For a start, you will need to be a competent 'C' programmer, with at least a working understanding of microcontroller architecture.

Assuming you have that, the first place to start with any new device is always to go to the manufacturer's Product Page - there you will find specifications, application notes, examples, tools, etc, etc, ...

https://www.avrfreaks.net/comment/2839426#comment-2839426

You haven't said which particular STM32F4 you're considering, so here's one at random:

https://www.st.com/en/microcontrollers-microprocessors/stm32f401.html

On the 'Resources' Tab, choose 'Technical Literature' and then 'Application Notes'

Spend some time browsing those - there's loads of useful stuff!

Juts to be awkward, it seems that the App Note you require is not listed!

:persevering_face:

AN3969: EEPROM emulation in STM32F40x/STM32F41x microcontrollers

https://www.st.com/content/ccc/resource/technical/document/application_note/ec/dd/8e/a8/39/49/4f/e5/DM00036065.pdf/files/DM00036065.pdf/jcr:content/translations/en.DM00036065.pdf

See also:

https://www.st.com/en/embedded-software/stsw-stm32066.html

https://community.st.com/s/question/0D50X00009XkhQn/stm32f4-eeprom-emulation-hal-library

4 replies

Tesla DeLorean
Tesla DeLorean
Guru
January 30, 2020

Start with the Reference Manual, and the description of the FLASH subsystem and registers

Example, try this

STM32Cube_FW_F4_V1.24.1\Projects\STM32F413ZH-Nucleo\Examples\FLASH\FLASH_EraseProgram

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TDK
TDK
Super User
January 30, 2020

To expand a little further, it is common to use the last page of flash to store program settings that you can read out and re-write during program execution. Note that flash isn't like RAM--you need to erase the entire page before you can write to any of it.

"If you feel a post has answered your question, please click ""Accept as Solution""."
Andrew Neil
Andrew NeilAnswer
Super User
January 30, 2020

"I need assistance on where I would start"

For a start, you will need to be a competent 'C' programmer, with at least a working understanding of microcontroller architecture.

Assuming you have that, the first place to start with any new device is always to go to the manufacturer's Product Page - there you will find specifications, application notes, examples, tools, etc, etc, ...

https://www.avrfreaks.net/comment/2839426#comment-2839426

You haven't said which particular STM32F4 you're considering, so here's one at random:

https://www.st.com/en/microcontrollers-microprocessors/stm32f401.html

On the 'Resources' Tab, choose 'Technical Literature' and then 'Application Notes'

Spend some time browsing those - there's loads of useful stuff!

Juts to be awkward, it seems that the App Note you require is not listed!

:persevering_face:

AN3969: EEPROM emulation in STM32F40x/STM32F41x microcontrollers

https://www.st.com/content/ccc/resource/technical/document/application_note/ec/dd/8e/a8/39/49/4f/e5/DM00036065.pdf/files/DM00036065.pdf/jcr:content/translations/en.DM00036065.pdf

See also:

https://www.st.com/en/embedded-software/stsw-stm32066.html

https://community.st.com/s/question/0D50X00009XkhQn/stm32f4-eeprom-emulation-hal-library

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
WNguy.1
WNguy.1Author
Associate II
January 30, 2020

Wow, amazing, thanks so much for the great advice and help! I'm using the Nucleo-F413ZH and programmed a CAN bus interface with a motor, in case of a power failure or general functionality, I'd want it to store its most recent position. I should be able to find the most optimal scenario if it'd be flashing the memory or using EEPROM for example.

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