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linux之alarm函数
1. alarm函数 [cpp] view plain copy [1] 引用头文件：#include ; [2] 函数标准式：unsigned int alarm(
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stm32f4 discovery RTC Alarm
手册中注意几个地方：RTC_SetAlarm() :The Alarm register can only be written when the corresponding Alarm is disabled (Use the RTC_AlarmCmd(DISABLE)).All RTC interrupts are connected to the EXTI control
