STM32F407 Backup SRAM backup regulator needed ?

Forum|Forum|5 years ago
February 22, 2021
2 replies
789 views

Hi

i would like to use the backup SRAM of the STM32F407 MCU to share boot flags between the bootloader and main firmware.

The flag should be used to signal a "boot into bootloader" requested by the main firmware.

To boot into the bootloader the main firmware will set the boot flag in the SRAM memory and afterwards execute NVIC_SystemReset() to perform a soft reset.

Is it necessary to enable the SRAM backup regulator if the MCU is only reset by a software reset while VCC stays stable ?

Is the backup SRAM powered from VCC as long as the backup SRAM regulator is disabled ?

Best regards

Yannic

STM32F4 series

This topic has been closed for replies.

waclawek.jan

Super User

JW

GLASS

Visitor II

You can also use the SRam instead of BackupRam. You only need to allocate a dedicated section in LD file of both bootloader and app, so asm startup will not erase those variables. Be carefull, you also need to put attribut in C declaration of flags so they will be located in this New section. This code must not rely on C initialisation...

See resulting map file to be sure you got the correct mapping.

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