STM32变量类型定义及延伸

注意：数据的运算可能会超过变量定义的类型 ，所以定义变量时要注意！

STM32F4内的变量类型定义：在stdint中

    /* exact-width signed integer types */

typedef   signed          char int8_t;

typedef   signed short     int int16_t;

typedef   signed           int int32_t;//在32位环境里，int代表4个字节32位

typedef   signed       __INT64 int64_t;

    /* exact-width unsigned integer types */

typedef unsigned          char uint8_t;

typedef unsigned short     int uint16_t;

typedef unsigned           int uint32_t;

typedef unsigned       __INT64 uint64_t;

    /* 7.18.1.2 */

    /* smallest type of at least n bits */

    /* minimum-width signed integer types */

typedef   signed          char int_least8_t;

typedef   signed short     int int_least16_t;

typedef   signed           int int_least32_t;

typedef   signed       __INT64 int_least64_t;

    /* minimum-width unsigned integer types */

typedef unsigned          char uint_least8_t;

typedef unsigned short     int uint_least16_t;

typedef unsigned           int uint_least32_t;

typedef unsigned       __INT64 uint_least64_t;

    /* 7.18.1.3 */

    /* fastest minimum-width signed integer types */

typedef   signed           int int_fast8_t;

typedef   signed           int int_fast16_t;

typedef   signed           int int_fast32_t;

typedef   signed       __INT64 int_fast64_t;

    /* fastest minimum-width unsigned integer types */

typedef unsigned           int uint_fast8_t;

typedef unsigned           int uint_fast16_t;

typedef unsigned           int uint_fast32_t;

typedef unsigned       __INT64 uint_fast64_t;

    /* 7.18.1.4 integer types capable of holding object pointers */

#if __sizeof_ptr == 8

typedef   signed       __INT64 intptr_t;

typedef unsigned       __INT64 uintptr_t;

#else

typedef   signed           int intptr_t;

typedef unsigned           int uintptr_t;

#endif

    /* 7.18.1.5 greatest-width integer types */

typedef   signed     __LONGLONG intmax_t;

typedef unsigned     __LONGLONG uintmax_t;

#if !defined(__cplusplus) || defined(__STDC_LIMIT_MACROS)

    /* 7.18.2.1 */

    /* minimum values of exact-width signed integer types */

#define INT8_MIN                   -128

#define INT16_MIN                -32768

#define INT32_MIN          (~0x7fffffff)   /* -2147483648 is unsigned */

#define INT64_MIN  __INT64_C(~0x7fffffffffffffff) /* -9223372036854775808 is unsigned */

    /* maximum values of exact-width signed integer types */

#define INT8_MAX                    127

#define INT16_MAX                 32767

#define INT32_MAX            2147483647

#define INT64_MAX  __INT64_C(9223372036854775807)

    /* maximum values of exact-width unsigned integer types */

#define UINT8_MAX                   255

#define UINT16_MAX                65535

#define UINT32_MAX           4294967295u

#define UINT64_MAX __UINT64_C(18446744073709551615)

 参考：https://blog.csdn.net/f1engmin11/article/details/70946471  和上述库文件中的一致