STM8S 头文件的 __near是什么意思
#define __IO_REG8_BIT(NAME, ADDRESS, ATTRIBUTE, BIT_STRUCT) \
__near __no_init volatile ATTRIBUTE union \
{ \
unsigned char NAME; \
BIT_STRUCT NAME ## _bit; \
} @ ADDRESS;
__near是什么意思求大神帮助 !
还有这 预定义替换 为什么动下都不行？ 我随便改成别的，然后再改回原来一模一样的也没用，就提示我一大堆错误
求大神帮助 !
求大神帮助 !
求大神帮助 !
求大神帮助 !
求大神帮助 !
__IO_REG8_BIT( SYS, 0xFFFFF802, __READ_WRITE )
#define __IO_REG8_BIT(NAME, ADDRESS, ATTRIBUTE) \
__near __no_init volatile ATTRIBUTE union \
{ \
unsigned char NAME; \
__BITS8 NAME ## _bit; \ // ## _bit ?? ## 可以连接前后
//比如 NAME 是 a，这句就//是 __BITS8 a_bit;
} @ ADDRESS;
typedef struct
{
unsigned char no0:1;
unsigned char no1:1;
unsigned char no2:1;
unsigned char no3:1;
unsigned char no4:1;
unsigned char no5:1;
unsigned char no6:1;
unsigned char no7:1;
} __BITS8;
__near
Syntax Follows the generic syntax rules for memory type attributes that can be used on data
objects, see Type attributes, page 193.
Description The __near memory attribute overrides the default storage of variables given by the
selected data model and places individual variables and constants in near memory. You
can also use the __near attribute to create a pointer explicitly pointing to an object
located in the near memory.
Storage information Address range: 0x0-07FFF and 0xFFFF8000-0xFFFFFFFF (64 Kbytes)
Example __near int x;
See also Memory types, page 13.
__no_init
Syntax Follows the generic syntax rules for object attributes, see Object attributes, page 195.
Description Use the __no_init keyword to place a data object in non-volatile memory. This means
that the initialization of the variable, for example at system startup, is suppressed.
Example __no_init int myarray;
#define PRERR SYS_bit.no0
以下转自http://renesasrulz.spaces.eepw.com.cn/articles/article/item/69883
__near会把宣告变量放在0x0-07FFF和0xFFFF8000-0xFFFFFFFF这两个靠近头尾的内存范围。
而__no_init会把变量放在非易失性存储器比如eeprom中，将其作为已初始化的变量来存储。 SInzo 发表于 2017-6-28 09:41
__near会把宣告变量放在0x0-07FFF和0xFFFF8000-0xFFFFFFFF这两个靠近头尾的内存范围。
而__no_init会把 ...
楼上说的对，就是这个意思
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