设备通过pmu_to_standbymode进入standby mode，
按下按键，RTC都可以唤醒
但是如果在唤醒之后判断当前是何种方式唤醒的呢？
RTC_INT_FLAG_ALARM这个试了不行
- /*!
- \brief get RTC interrupt flag status
- \param[in] flag: specify which flag status to get
- only one parameter can be selected which is shown as below:
- \arg RTC_INT_FLAG_SECOND: second interrupt flag
- \arg RTC_INT_FLAG_ALARM: alarm interrupt flag
- \arg RTC_INT_FLAG_OVERFLOW: overflow interrupt flag
- \param[out] none
- \retval SET or RESET
- */
- FlagStatus rtc_interrupt_flag_get(uint32_t flag)
- {
- if(RESET != (RTC_CTL & flag)){
- return SET;
- }else{
- return RESET;
- }
- }
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