/**
* @brief This function configures the system to enter Standby mode with RTC
* clocked by LSE or LSI and with Backup SRAM ON for current consumption
* measurement purpose.
* STANDBY Mode with RTC clocked by LSE/LSI and BKPSRAM
* ====================================================
* - RTC Clocked by LSE or LSI
* - Backup SRAM ON
* - IWDG OFF
* - Automatic Wakeup using RTC clocked by LSE/LSI (after ~20s)
* @param None
* @retval None
*/
void StandbyRTCBKPSRAMMode_Measure(void)
{
/*## Configure the RTC peripheral###########################################*/
/* Configure RTC prescaler and RTC data registers as follow:
- Hour Format = Format 24
- Asynch Prediv = Value according to source clock
- Synch Prediv = Value according to source clock
- OutPut = Output Disable
- OutPutPolarity = High Polarity
- OutPutType = Open Drain */
RTCHandle.Instance = RTC;
RTCHandle.Init.HourFormat = RTC_HOURFORMAT_24;
RTCHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
RTCHandle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
RTCHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
RTCHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
RTCHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
if(HAL_RTC_Init(&RTCHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/*## Configure the Wake up timer ###########################################*/
/* RTC Wakeup Interrupt Generation:
Wakeup Time Base = (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSE or LSI))
Wakeup Time = Wakeup Time Base * WakeUpCounter
= (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSE or LSI)) * WakeUpCounter
==> WakeUpCounter = Wakeup Time / Wakeup Time Base
To configure the wake up timer to 20s the WakeUpCounter is set to 0xA017:
RTC_WAKEUPCLOCK_RTCCLK_DIV = RTCCLK_Div16 = 16
Wakeup Time Base = 16 /(~32.768KHz) = ~0,488 ms
Wakeup Time = ~20s = 0,488ms * WakeUpCounter
==> WakeUpCounter = ~20s/0,488ms = 40983 = 0xA017 */
/* Disable Wake-up timer */
HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle);
/*## Clear all related wakeup flags ########################################*/
/* Clear PWR wake up Flag */
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
/* Clear RTC Wake Up timer Flag */
__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&RTCHandle, RTC_FLAG_WUTF);
/*## Setting the Wake up time ##############################################*/
HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, (0xA000-1), RTC_WAKEUPCLOCK_RTCCLK_DIV16);
/* Enable BKPRAM Clock */
__HAL_RCC_BKPSRAM_CLK_ENABLE();
/* Enable the Backup SRAM low power Regulator */
HAL_PWREx_EnableBkUpReg();
/*## Enter Standby Mode ####################################################*/
/* Request to enter STANDBY mode */
HAL_PWR_EnterSTANDBYMode();
}
/**
* @brief This function configures the system to enter Standby mode with
* backup SRAM ON for current consumption measurement purpose.
* STANDBY Mode
* ============
* - RTC OFF
* - IWDG and LSI OFF
* - Backup SRAM ON
* - Wakeup using WakeUp Pin (PI.11)
* @param None
* @retval None
*/
void StandbyBKPSRAMMode_Measure(void)
{
/* Enable Power Clock*/
__HAL_RCC_PWR_CLK_ENABLE();
/* Allow access to Backup */
HAL_PWR_EnableBkUpAccess();
/* Reset RTC Domain */
__HAL_RCC_BACKUPRESET_FORCE();
__HAL_RCC_BACKUPRESET_RELEASE();
/* Disable all used wakeup sources: Pin6(PI.11) */
HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN6);
/* Clear all related wakeup flags */
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
/* Re-enable all used wakeup sources: Pin6(PI.11) */
HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN6);
/* Enable BKPRAM Clock */
__HAL_RCC_BKPSRAM_CLK_ENABLE();
/* Enable the Backup SRAM low power Regulator */
HAL_PWREx_EnableBkUpReg();
/* Request to enter STANDBY mode */
HAL_PWR_EnterSTANDBYMode();
}
/**
* @brief This function configures the system to enter Standby mode with RTC
* clocked by LSE or LSI and with Backup SRAM ON for current consumption
* measurement purpose.
* STANDBY Mode with RTC clocked by LSE/LSI and BKPSRAM
* ====================================================
* - RTC Clocked by LSE or LSI
* - Backup SRAM ON
* - IWDG OFF
* - Automatic Wakeup using RTC clocked by LSE/LSI (after ~20s)
* @param None
* @retval None
*/
void StandbyRTCBKPSRAMMode_Measure(void)
{
// /*rtc_init */
// rtc_init();
// /*wake up timer*/
// rtc_wake_up_timer_config(0x5000);
/* Enable BKPRAM Clock */
__HAL_RCC_BKPSRAM_CLK_ENABLE();
/* Enable the Backup SRAM low power Regulator */
HAL_PWREx_EnableBkUpReg();
/*## Enter Standby Mode ####################################################*/
/* Request to enter STANDBY mode */
HAL_PWR_EnterSTANDBYMode();
}