common.h 设置位

#ifndef __COMMON_H
#define __COMMON_H

#define vi *( volatile unsigned int * ) 

#define set_zero( addr, bit ) ( (vi addr) &= ( ~ ( 1 << (bit) ) ) )
#define set_one( addr, bit ) ( (vi addr) |= ( 1 << ( bit ) ) )

#define set_bit( addr, bit, val ) ( (vi addr) = (( vi addr)&=(~(1<<(bit))) ) | ( (val)<<(bit) ) )

#define set_2bit( addr, bit, val ) ( (vi addr) = (( vi addr)&(~(3<<(bit))) ) | ( (val)<<(bit) ) )

#define set_nbit( addr, bit, len,  val ) \
	( (vi addr) = ((( vi addr)&(~(( ((1<<(len))-1) )<<(bit))))  | ( (val)<<(bit) ) ))

#define get_bit( addr, bit ) ( (( vi addr ) & ( 1 << (bit) )) > 0  )

#define get_val( addr, val ) ( vi addr )
#define set_val( addr, val ) ( (vi addr) = (val) )
#define or_val( addr, val ) ( (vi addr) |= (val) ) 

///////////////////////////////

void delay( int sec );
int mydiv( int a, int b );

#endif /* __COMMON_H */