Active tampering event as a wakeup source in Standby mode

[leonahi]

Hello,

 

Can you please share an example code where active tampering is enabled in Standby mode and tamper event (disconnect loop) is used to wake up the MCU.

I would like to know how we can configure the TAMP as a wakeup source during Standby. 

If you can show configuration in terms of STM HAL driver that would be great. Let me know if you need more context.

 

Kind Regards,

[OOUAD]

Hello leonahi,

You can refer to the example in STM32Cube_FW_WBA for tamper initialization at:
STM32Cube_FW_WBA_V1.7.0\Projects\STM32WBA55G-DK1\Examples_LL\RTC\RTC_Tamper_Init

You also need to add the tamper wakeup source configuration and the standby mode entry function as follows:

/* USER CODE BEGIN 2 */

/* @brief Enable the wake up line functionality. PWR_WAKEUP_PIN8_HIGH_3 < TAMP : Wakeup pin 8 (high polarity) */
HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN8_HIGH_3)
/* @brief Enter the whole system to Standby mode.*/
HAL_PWR_EnterSTANDBYMode();
/* USER CODE END 2 */

 

BRs

[leonahi]

Thanks for the answer.

One follow-up question:

I enabled two active tampering loops (TAMP_IN1 - TAMP_OUT5 and TAMP_IN6 - TAMP_OUT4) in standby and the measured current is around ~0.35uA, which is something similar to what is mentioned in datasheet for "standby with RTC".

I would like to know whether this behavior is expected when active tamper is enabled? Since TAMP is part of the RTC, I understand that the full RTC module is enabled.

Does this also depend on how many active tamper loops are enabled because I can see similar current irrespective of one or two loops are enabled?

Thanks in advance.