Yes, this mode is defined: STANDBY_RTC_LSI_MODE
This is example code I used for my project.
#elif defined (STANDBY_RTC_LSI_MODE)
void StandbyRTCLSIMode_Measure(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIOs clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC, ENABLE);
/* Configure the LED_pin as output push-pull for LD3 & LD4 usage*/
GPIO_InitStructure.GPIO_Pin = LD_GREEN_GPIO_PIN | LD_BLUE_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(LD_GPIO_PORT, &GPIO_InitStructure);
/* Force a low level on LEDs*/
GPIO_LOW(LD_GPIO_PORT,LD_GREEN_GPIO_PIN);
GPIO_LOW(LD_GPIO_PORT,LD_BLUE_GPIO_PIN);
// /* Wait Until Key button pressed */
/* Enable the RTC Wakeup Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = RTC_WKUP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Allow access to RTC */
PWR_RTCAccessCmd(ENABLE);
/*!< LSI Enable */
RCC_LSICmd(ENABLE);
/*!< Wait till LSI is ready */
while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
{}
/*!< RTC Clock Source Selection */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
/* Enable the RTC Clock */
RCC_RTCCLKCmd(ENABLE);
/* Wait for RTC APB registers synchronisation */
RTC_WaitForSynchro();
/* Enable Ultra low power mode */
PWR_UltraLowPowerCmd(ENABLE);
/* RTC Wakeup Interrupt Generation: Clock Source: RTCCLK_Div16, Wakeup Time Base: ~4s
RTC Clock Source LSI ~37KHz
*/
RTC_WakeUpClockConfig(RTC_WakeUpClock_RTCCLK_Div16);
RTC_SetWakeUpCounter(0x2421);
/* Clear PWR WakeUp flag */
PWR_ClearFlag(PWR_FLAG_WU);
/* Clear RTC WakeUp (WUTF) flag */
RTC_ClearFlag(RTC_FLAG_WUTF);
/* Enable the Wakeup Interrupt */
RTC_ITConfig(RTC_IT_WUT, ENABLE);
/* Enable Wakeup Counter */
RTC_WakeUpCmd(ENABLE);
/* Request to enter STANDBY mode */
PWR_EnterSTANDBYMode();
/* Infinite loop */
while (1)
{
/* Toggle The LED1 */
GPIO_TOGGLE(LD_GPIO_PORT,LD_GREEN_GPIO_PIN);
/* Inserted Delay */
for(index = 0; index < 0x5FF; index++);
}
}
Now, I change to STOP_RTC_LSI_MODE, but I won't better. because I deal with other problem here. I actually got stuck with this. I used MSP430 TI chip before, I work exactly as the code reference.
I have STM32L152c-discovery kit. In the reference design, ST use pin PA.0 to wake up source, that why I can test in real project use RTC wake up source.
