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bbit.c File Reference

Detailed Description

Functions for performing bit-level operations.

Definition in file bbit.c.

#include "../include/beeos.h"
#include "../include/bbit.h"

Include dependency graph for bbit.c:

Include dependency graph

Go to the source code of this file.

Functions

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

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

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

Function Documentation

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 }

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 }

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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