STM32U575 SRAM data retention in Standby mode

[Istillaga]

Hello,

I am trying to make a program in which the micro stm32u5 is stored in ram memory some data after activating the Sleep Mode.For this I have defined in the flash file the SRAM2 memory that is supposed to be in charge of this and I have saved it as noload so that it keeps its values:

SRAM2 (xrw) : ORIGIN = 0x20030000, LENGTH = 64K

.ram2 (NOLOAD):

{

_sram2 = ..;

*(.ram2*)

. = ALIGN(4);

_eram2 = ;

} >SRAM2

Once SRAM2 is defined, I have saved a structure in that section of  srram2 memory:

NODEconf_TypeDef NODE_conf __attribute__((section(".ram2")));

When I run the code I can see in Memory that this structure is well stored in memory, but when I run the Standby Mode and it is awakened by the RTC alarm, all the parameters of the structure are erased.

void SLEEP_mode(void)
{
	HAL_PWREx_EnableSRAM2ContentStandbyRetention(PWR_SRAM2_PAGE1_STANDBY);

	HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN7_HIGH_3);
	HAL_PWR_EnterSTANDBYMode();
}

Any help?

[Istillaga · Accepted solution]

The problem was that I was using the stm32u5xx_hal_timebase_rtc_alarm_template.c library, and a part of the code triggered a forced reset of the memory.