Bug STM32L452CEU6 Internal WakeUp using RTC using CubeMX

Hello @MHoh.1l​ 

First let me thank you for posting.

After investigation I was able to reproduce the same behavior using the same environment as you did.

As a temporary solution I propose that you add the following instructions in the void MX_RTC_Init(void) function in the rtc.c file:

 /* USER CODE BEGIN RTC_Init 2 */
 /** Enable the WakeUp
 */
 if (HAL_RTCEx_SetWakeUpTimer(&hrtc, 0, RTC_WAKEUPCLOCK_RTCCLK_DIV16) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE END RTC_Init 2 */

This is an example of implementation of the solution; you can set the wakeup clock divider and the counter value as you need and pass the values to HAL_RTCEx_SetWakeUpTimer function.

With this being said, this problem is raised internally to be reviewed. I'll keep you posted with the updates.

Internal ticket number: 138078 (This is an internal tracking number and is not accessible or usable by customers).

Thx

Semer.