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bbit.h File Reference

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Defines

#define bitmclr(var, bitm)
#define bitmset(var, bitm)

Functions

__inline__ void bitnclr (uchar *addr, uchar bitn)
 Clears bit @ addr (bit is 0..7).

__inline__ void bitnset (uchar *addr, uchar bitn)
 Sets bit @ addr (bit is 0..7).

__inline__ bool bitncheck (uchar *addr, uchar bitn)
 Checks bit @ addr (bit is 0..7).

Define Documentation

#define bitmclr (  var,
bitm   ) 
 

Value:

do { \
    __asm__ __volatile__ ( \
        "bclr %0, %1" \
        :                           /* Output */ \
        : "p" (&var), "n" (bitm)    /* Input */ \
        : "%ccr"                    /* Clobbered */ \
    ); \
 \
} while (0);

Definition at line 8 of file bbit.h.

#define bitmset (  var,
bitm   ) 
 

Value:

do { \
    __asm__ __volatile__ ( \
        "bset %0, %1" \
        :                           /* Output */ \
        : "p" (&var), "n" (bitm)    /* Input */ \
        : "%ccr"                    /* Clobbered */ \
    ); \
 \
} while (0);

Definition at line 19 of file bbit.h.

Function Documentation

__inline__ bool bitncheck (  uchar *  addr,
uchar  bitn
) 
 

Checks bit @ addr (bit is 0..7).

Parameters:
addr char pointer to byte being tested
bitn char value (0..7) representing bit to check.
Return values:
bool Matches the state of bit @ addr

Definition at line 61 of file bbit.c.

References uchar.

Referenced by btnscan_chk(). 

00063 {
00064     if ((*addr & (0x01<<bitn)) != '\0') return true;
00065         else return false;
00066 }

__inline__ void bitnclr (  uchar *  addr,
uchar  bitn
) 
 

Clears bit @ addr (bit is 0..7).

Parameters:
addr char pointer to byte being manipulated
bitn char value (0..7) representing bit to clear.

Definition at line 32 of file bbit.c.

References uchar. 

00034 {
00035     *addr &= ~(0x01<<bitn);
00036 
00037     return;
00038 }

__inline__ void bitnset (  uchar *  addr,
uchar  bitn
) 
 

Sets bit @ addr (bit is 0..7).

Parameters:
addr char pointer to byte being manipulated
bitn char value (0..7) representing bit to set.

Definition at line 46 of file bbit.c.

References uchar. 

00048 {
00049     *addr |= 0x01<<bitn;
00050     
00051     return;
00052 }

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