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STM32N655 BKPSRAM

B.Kaya
Associate III

Hello,

In my project, I want to hold boot params in BKPSRAM so application project can also write and read this section easily. Therefore, I tried to write and read in this area some parameters. I can see the datas in "BKPSRAM_BASE_S" section while debugging but when I restart the debug session all fill with zero. I know that I am missing something but did not find it. 

	
#define BKP_SRAM_START_ADDRESS			((uint32_t)BKPSRAM_BASE_S)
#define BOOT_PARAMS_PTR         		((BootParameters_t*)BKP_SRAM_START_ADDRESS)

        /* USER CODE BEGIN Init */
	__HAL_RCC_BKPSRAM_MEM_CLK_ENABLE();
	HAL_PWREx_EnableBkupRAMRetention();
	HAL_PWR_EnableBkUpAccess();
	/* USER CODE END Init */

	/* Configure the system clock */
	SystemClock_Config();

	/* Configure the peripherals common clocks */
	PeriphCommonClock_Config();

	/* USER CODE BEGIN SysInit */
	SystemIsolation_Config();
	/* USER CODE END SysInit */

	/* Initialize all configured peripherals */
	MX_GPIO_Init();
	MX_HPDMA1_Init();
	MX_XSPI2_Init();
	/* USER CODE BEGIN 2 */
	MX_EXTMEM_MANAGER_Init();

	s_boot_params.o_boot_mode = TRUE;
	memcpy(&s_boot_params.ab_version[0], k_BOOTLOADER_VERSION, 4);

	/* Write to backup ram */
	memcpy((void*) BOOT_PARAMS_PTR, &s_boot_params, sizeof(BootParameters_t));

	/*Read from backup ram */
//	memcpy(&s_boot_params, (void*) BOOT_PARAMS_PTR, sizeof(BootParameters_t));


Any help appreciated.
Best Regards.

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