stdint.h 这里放着C语言的标准表达方式
typedef signed char int8_t; typedef signed short int int16_t;typedef signed int int32_t;typedef signed __int64 int64_t;
typedef unsigned char uint8_t;typedef unsigned short int uint16_t;typedef unsigned int uint32_t;typedef unsigned __int64 uint64_t;
stm32f10x.h 这个文件主要是为了兼容旧版本
typedef uint32_t u32; ///32位typedef uint16_t u16; ///16位typedef uint8_t u8; ///8位
u8 最大255 , u16最大65535 , 就这个意思u8 a=255 a+1=0 , u16 b=255 b+1=256