/**
* @brief Enters STANDBY mode.
* @param None
* @retval None
*/
void PWR_EnterSTANDBYMode(void) {
/* Clear Wake-up flag */
PWR->CR |= CR_CWUF_Set;
/* Select STANDBY mode */
PWR->CR |= CR_PDDS_Set;
/* Set SLEEPDEEP bit of Cortex System Control Register */
*(__IO uint32_t*)SCB_SysCtrl |= SysCtrl_SLEEPDEEP_Set;
/* This option is used to ensure that store operations are completed */
#if defined(__CC_ARM)
__force_stores();
#endif
/* Request Wait For Interrupt */
__WFI();
}
/**
* @brief Enters Standby mode.
* @note In Standby mode, all I/O pins are high impedance except for:
* - Reset pad (still available)
* - RTC_AF1 pin (PC13) if configured for tamper, time-stamp, RTC
* Alarm out, or RTC clock calibration out.
* - RTC_AF2 pin (PI8) if configured for tamper or time-stamp.
* - WKUP pins if enabled.
* @retval None
*/
void HAL_PWR_EnterSTANDBYMode(void)
{
/* Select Standby mode */
PWR->CR1 |= PWR_CR1_PDDS;
/* Set SLEEPDEEP bit of Cortex System Control Register */
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
/* This option is used to ensure that store operations are completed */
#if defined ( __CC_ARM)
__force_stores();
#endif
/* Request Wait For Interrupt */
__WFI();
}
/**
* @brief Enter Standby mode.
* @note In Standby mode, the PLL, the HSI, the MSI and the HSE oscillators are switched
* off. The voltage regulator is disabled, except when SRAM2 content is preserved
* in which case the regulator is in low-power mode.
* SRAM1 and register contents are lost except for registers in the Backup domain and
* Standby circuitry. SRAM2 content can be preserved if the bit RRS is set in PWR_CR3 register.
* To enable this feature, the user can resort to HAL_PWREx_EnableSRAM2ContentRetention() API
* to set RRS bit.
* The BOR is available.
* @note The I/Os can be configured either with a pull-up or pull-down or can be kept in analog state.
* HAL_PWREx_EnableGPIOPullUp() and HAL_PWREx_EnableGPIOPullDown() respectively enable Pull Up and
* Pull Down state, HAL_PWREx_DisableGPIOPullUp() and HAL_PWREx_DisableGPIOPullDown() disable the
* same.
* These states are effective in Standby mode only if APC bit is set through
* HAL_PWREx_EnablePullUpPullDownConfig() API.
* @retval None
*/
void HAL_PWR_EnterSTANDBYMode(void)
{
/* Set Stand-by mode */
MODIFY_REG(PWR->CR1, PWR_CR1_LPMS, PWR_CR1_LPMS_STANDBY);
/* Set SLEEPDEEP bit of Cortex System Control Register */
SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
/* This option is used to ensure that store operations are completed */
#if defined ( __CC_ARM)
__force_stores();
#endif
/* Request Wait For Interrupt */
__WFI();
}
/**
* @brief Enter the system to STANDBY mode.
* @note The system enters Standby mode only when the D1, D2 and D3 domains are in DStandby.
* @note When the System exit STANDBY mode by issuing an interrupt or a wakeup event,
* the HSI RC oscillator is selected as system clock.
* @retval None.
*/
void HAL_PWR_EnterSTANDBYMode(void)
{
/* Keep DSTANDBY mode when D1 domain enters Deepsleep */
SET_BIT(PWR->CPUCR, PWR_CPUCR_PDDS_D1);
/* Keep DSTANDBY mode when D2 domain enters Deepsleep */
SET_BIT(PWR->CPUCR, PWR_CPUCR_PDDS_D2);
/* Keep DSTANDBY mode when D3 domain enters Deepsleep */
SET_BIT(PWR->CPUCR, PWR_CPUCR_PDDS_D3);
/* Set SLEEPDEEP bit of Cortex System Control Register */
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
/* This option is used to ensure that store operations are completed */
#if defined ( __CC_ARM)
__force_stores();
#endif
/* Request Wait For Interrupt */
__WFI();
}
