嵌入式编程中的uintX_t

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其实uintX_t就是通过typedef定义的，利用预编译和typedef可提高效率也方便代码移植。

在MDK5编译器中的stdint.h文件夹中，详细定义了uintX_t的各种类型，如下所示：

/*
 * 'signed' is redundant below, except for 'signed char' and if
 * the typedef is used to declare a bitfield.
 * '__int64' is used instead of 'long long' so that this header
 * can be used in --strict mode.
 */

    /* 7.18.1.1 */

    /* exact-width signed integer types */
typedef   signed          char int8_t;						//ÓзûºÅ8λÊý
typedef   signed short     int int16_t;						//ÓзûºÅ16λÊý
typedef   signed           int int32_t;						//ÓзûºÅ32λÊý
typedef   signed       __int64 int64_t;						//ÓзûºÅ63λÊý

    /* exact-width unsigned integer types */
typedef unsigned          char uint8_t;						//ÎÞ·ûºÅ8λÊý
typedef unsigned short     int uint16_t;					//ÎÞ·ûºÅ16λÊý
typedef unsigned           int uint32_t;					//ÎÞ·ûºÅ32λÊý
typedef unsigned       __int64 uint64_t;					//ÎÞ·ûºÅ64λÊý