stm8 io位操作

只看该作者 · 2013-10-29 15:39

#define KEY2 PE3 比如这个语句可以吗，或者PE3应该怎么取。我这么直接预定义的话，调用KET2时候编译会报错。

只看该作者 · 2013-10-29 16:34

看你的编译器定义，与STM8S无关。

STM8S的汇编本身是有位指令操作的，你可以自定义，也可以用现成的。
在STM8S的库下面有个文件叫STM8S.H，里面已经帮你写好了。你可以直接调用

/*============================== Handling bits ====================================*/

/*-----------------------------------------------------------------------------

Method : I

Description : Handle the bit from the character variables.

Comments :    The different parameters of commands are

              - VAR : Name of the character variable where the bit is located.

              - Place : Bit position in the variable (7 6 5 4 3 2 1 0)

              - Value : Can be 0 (reset bit) or not 0 (set bit)

              The "MskBit" command allows to select some bits in a source

              variables and copy it in a destination var (return the value).

              The "ValBit" command returns the value of a bit in a char

              variable: the bit is reseted if it returns 0 else the bit is set.

              This method generates not an optimised code yet.

-----------------------------------------------------------------------------*/

#define SetBit(VAR,Place)         ( (VAR) |= (u8)((u8)1<<(u8)(Place)) )

#define ClrBit(VAR,Place)         ( (VAR) &= (u8)((u8)((u8)1<<(u8)(Place))^(u8)255) )



#define ChgBit(VAR,Place)         ( (VAR) ^= (u8)((u8)1<<(u8)(Place)) )

#define AffBit(VAR,Place,Value)   ((Value) ? \

                                   ((VAR) |= ((u8)1<<(Place))) : \

                                   ((VAR) &= (((u8)1<<(Place))^(u8)255)))

#define MskBit(Dest,Msk,Src)      ( (Dest) = ((Msk) & (Src)) | ((~(Msk)) & (Dest)) )



#define ValBit(VAR,Place)         ((u8)(VAR) & (u8)((u8)1<<(u8)(Place)))



#define BYTE_0(n)                 ((u8)((n) & (u8)0xFF))        /*!< Returns the low byte of the 32-bit value */

#define BYTE_1(n)                 ((u8)(BYTE_0((n) >> (u8)8)))  /*!< Returns the second byte of the 32-bit value */

#define BYTE_2(n)                 ((u8)(BYTE_0((n) >> (u8)16))) /*!< Returns the third byte of the 32-bit value */

#define BYTE_3(n)                 ((u8)(BYTE_0((n) >> (u8)24))) /*!< Returns the high byte of the 32-bit value */



/*============================== Assert Macros ====================================*/

#define IS_STATE_VALUE_OK(SensitivityValue) \

  (((SensitivityValue) == ENABLE) || \

   ((SensitivityValue) == DISABLE))



/*-----------------------------------------------------------------------------

Method : II

Description : Handle directly the bit.

Comments :    The idea is to handle directly with the bit name. For that, it is

              necessary to have RAM area descriptions (example: HW register...)

              and the following command line for each area.

              This method generates the most optimized code.

-----------------------------------------------------------------------------*/



#define AREA 0x00     /* The area of bits begins at address 0x10. */



#define BitClr(BIT)  ( *((unsigned char *) (AREA+(BIT)/8)) &= (~(1<<(7-(BIT)%8))) )

#define BitSet(BIT)  ( *((unsigned char *) (AREA+(BIT)/8)) |= (1<<(7-(BIT)%8)) )

#define BitVal(BIT)  ( *((unsigned char *) (AREA+(BIT)/8)) & (1<<(7-(BIT)%8)) )



/* Exported functions ------------------------------------------------------- */



#endif /* __STM8S_H */