SysTick_Init();// 开始rtcalarm计数并使能rtcalarm中断SysTick_Enable();// 先设置默认的RTC预分频系数(rtc tike = ~1ms)RTC_SetPrescaler(DEF_RTC_PRESCALER);/* Enable RTC Clock */RCC_RTCCLKCmd(ENABLE);/* Wait for RTC registers synchronization */RTC_WaitForSynchro();/* Wait until last write...