编程区分CPU大小端

CodeAllen嵌入式编程发布时间：2020-07-04 16:30:32 ，浏览量：1

编程区分CPU大小端

- - - 编写一段代码判断系统中的CPU是小端还是大端模式？
    - - 方法1：将一个字节的数据和一个整型数据存放于同样的内存的开始地址
        
        方法2；union成员本身被存在相同的内存空间（共享内存）
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编写一段代码判断系统中的CPU是小端还是大端模式？方法1：将一个字节的数据和一个整型数据存放于同样的内存的开始地址

通过读取整数数据，分析字节在整型数据的高位还是地位来判断CPU工作于小端还是大端

        大端认为第一个字节是最高位字节（按照从低地址到高地址的顺序存放数据的高位字节到低位字节）
        小端正相反，认为第一个字节是最低位字节（低地址到高地址存放数据的低位字节到高位字节）

一般来说X86是小端字节序（常见），PowerPC是大端

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