flash的规则是，初始化时都是0xff, 写的时候你可以把1改为0，但是没法再从0改到1，需要重新擦除。而擦除需要按页擦除也就是2K一擦。
所以，使用协议栈的osal_nv.c 对flash有很好的管理。建议使用osal_nv的flash操作接口。代码都可见，自行研究。
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