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原来想用rtc时间命名保存图片名称着，IDE里面有产生随机数的函数吗？我想用随机数来命名下
。。。板子上没有纽扣电池。也不占多大地方，建议改版可以加上。。不可能总上电的，断了即使保存，不运行，时间也不准啊。
RTC时间是否可以保存？为何每次上电都是2015.1.1开始算起的？