stm32 数据类型的定义
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在Keil MDK 开发环境里,比如一个 无符号32位整形数据会有很多种表示方法:1,unsigned int 32 (C语言标准表达方法) 2,uint32_t ;3 ,u32;这三种方式都是在表达同一个意思,可为什么ST的开发人员要搞的这么乱呢? 还有其他好多你可能看起来很陌生 ,很不好理解的表达方式,如:_IOint32_t他等同于vs32(这个你同样很陌生),不过他还等同于 volatile int32_t,还等同于 volatilesigned int 32;最后这种表达方式才是C语言的标准表达方式,够乱吧,能把初学者弄的晕头转向。
其实ST 搞这么多花样,无非是想开发人员在写代码时定义数据类型能少写几个符号,然后又因为前后版本升级,为了兼容旧版本(主要是V2.0)才会出现这么多表示方法。不管他怎么换,都是基于标准C来的,看清楚以下几个文件你就OK了:core_cm3.h;stm32f10x.h;stdint.h;其中每个文件大概作用如下:
stdint.h 这里放着C语言的标准表达方式
//第36行开始
typedefsignedchar int8_t;//标准表达方式 signed char 被等同于 int8_t;
typedefsigned shortint int16_t;
typedefsignedint int32_t;//在32位环境里,int代表4个字节32位!!
typedefsigned__int64 int64_t;
typedef unsignedchar uint8_t;
typedef unsigned shortint uint16_t;
typedef unsignedint uint32_t;
typedef unsigned__int64 uint64_t;
typedefsignedchar int_least8_t;
typedefsigned shortint int_least16_t;
typedefsignedint int_least32_t;
typedefsigned__int64 int_least64_t;
typedef unsignedchar uint_least8_t;
typedef unsigned shortint uint_least16_t;
typedef unsignedint uint_least32_t;
typedef unsigned__int64 uint_least64_t;
typedefsignedint int_fast8_t;
typedefsignedint int_fast16_t;
typedefsignedint int_fast32_t;
typedefsigned__int64 int_fast64_t;
typedef unsignedint uint_fast8_t;
typedef unsignedint uint_fast16_t;
typedef unsignedint uint_fast32_t;
typedef unsigned__int64 uint_fast64_t;
typedefsignedint intptr_t;
typedef unsignedint uintptr_t;
typedefsigned__int64 intmax_t;
typedef unsigned__int64 uintmax_t;
core_cm3.h 文件主要针对动态 静态 变量修饰符做出类型扩展
#ifdef __cplusplus
#define__Ivolatile
#else
#define__Ivolatile const
#endif
#define__Ovolatile
#define__IOvolatile
stm32f10x.h 这个文件主要是为了兼容旧版本吧
typedef int32_ts32;
typedef int16_t s16;
typedef int8_ts8;
typedef const int32_t sc32;
typedef const int16_t sc16;
typedef const int8_t sc8;
typedef __IO int32_tvs32;
typedef __IO int16_tvs16;
typedef __IO int8_tvs8;
typedef __I int32_t vsc32;
typedef __I int16_t vsc16;
typedef __I int8_t vsc8;
typedef uint32_tu32;
typedef uint16_t u16;
typedef uint8_tu8;
typedef const uint32_t uc32;
typedef const uint16_t uc16;
typedef const uint8_t uc8;
typedef __IO uint32_tvu32;
typedef __IO uint16_t vu16;
typedef __IO uint8_tvu8;
typedef __I uint32_t vuc32;
typedef __I uint16_t vuc16;
typedef __I uint8_t vuc8;