Hl_st, thank you for your reply.
First, calls the following functions as initialization of RTC
・MX_RTC_Init
・Init_Rtc
・HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, RTC_WUT_TIME, (uint32_t)CFG_RTC_WUCKSEL_DIVIDER);
The code is given below.
===============================
static void MX_RTC_Init(void)
{
/** Initialize RTC Only
*/
hrtc.Instance = RTC;
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
hrtc.Init.AsynchPrediv = CFG_RTC_ASYNCH_PRESCALER;
hrtc.Init.SynchPrediv = CFG_RTC_SYNCH_PRESCALER;
hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
hrtc.Init.OutPutRemap = RTC_OUTPUT_REMAP_NONE;
if (HAL_RTC_Init(&hrtc) != HAL_OK)
{
Error_Handler();
}
/** Enable the WakeUp
*/
if (HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 0xFFFF, RTC_WAKEUPCLOCK_RTCCLK_DIV16) != HAL_OK)
{
Error_Handler();
}
}
static void Init_Rtc( void )
{
/* Disable RTC registers write protection */
LL_RTC_DisableWriteProtection(RTC);
LL_RTC_WAKEUP_SetClock(RTC, CFG_RTC_WUCKSEL_DIVIDER);
/* Enable RTC registers write protection */
LL_RTC_EnableWriteProtection(RTC);
return;
}
/* RTC_WUT_TIME is 16386U. CFG_RTC_WUCKSEL_DIVIDER is 3. */
HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, RTC_WUT_TIME, (uint32_t)CFG_RTC_WUCKSEL_DIVIDER);
===============================
Here is the code just before entering standby:
===============================
LL_PWR_EnableBkUpAccess();
/* Reset Internal Wake up flag */
LL_RTC_ClearFlag_WUT(RTC);
/* Check that PWR Internal Wake-up is enabled */
if (LL_PWR_IsEnabledInternWU() == 0U)
{
/* Need to enable the Internal Wake-up line */
LL_PWR_EnableInternWU();
}
/* Set Standby mode */
LL_PWR_SetPowerMode(LL_PWR_MODE_STANDBY);
/* Set Standby mode of CPU2 */
/* Note: On STM32WB, both CPU1 and CPU2 must be in Standby mode to set the entire system in Standby mode */
LL_C2_PWR_SetPowerMode(LL_PWR_MODE_STANDBY);
/* Retain SRAM2a */
LL_PWR_EnableSRAM2Retention();
/* Set SLEEPDEEP bit of Cortex System Control Register */
LL_LPM_EnableDeepSleep();
/* Request Wait For Interrupt */
__WFI();
===============================
