[riot-notifications] [RIOT-OS/RIOT] cpu/stm32: make backup SRAM available (#16870)

fabian18 notifications at github.com
Thu Sep 23 14:15:01 CEST 2021

@fabian18 commented on this pull request.

> +void backup_ram_init(void);
+ * @brief   Check whether the backup RAM regulator is on and backup RAM
+ *          content is retained while asleep
+ */
+bool backup_ram_is_retained(void);
+ * @brief   Enable the backup RAM regulator to retain it´s content
+ *          during standby mode
+ */
+void backup_ram_sleep(void);
+ * @brief   Disable the backup RAM regulator

Option 1:
You mean I should measure the current when the regulator is on and when it is off?
So if the current does not increase significantly, we keep the regulator enabled all the time?

Option 2:
To really know if the regulator is required when the board is powered only by `V_Bat`, I think I would have to remove solder bridge (156) that connects `V_DD` with `V_Bat` on my `nucleo-f767zi` and then connect a coin cell with `GND` and `V_Bat` pin to power the board.

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