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STM32L151中RTC_WakeUpCmd（）函数带来了系统延时
ErrorStatus RTC_WakeUpCmd(FunctionalState NewState){__IO uint32_t wutcounter = 0x00;uint32_t wutwfstatus = 0x00;ErrorStatus status = ERROR;assert_param(IS_FUNCTIONAL_STATE(NewState));RTC->WPR = 0xCA;R
ErrorStatus RTC_WakeUpCmd(FunctionalState NewState){__IO uint32_t wutcounter = 0x00;uint32_t wutwfstatus = 0x00;ErrorStatus status = ERROR;assert_param(IS_FUNCTIONAL_STATE(NewState));RTC->WPR = 0xCA;R
