util.h

8051 interrupt assemble code

#ifndef UTIL_H
#define UTIL_H

#define NELEM(a) (sizeof(a)/sizeof((a)[0]))

#define HIGH_NIBBLE_SET(l,r) ((l) = (r)<<4 | (l)&0x0f)
#define LOW_NIBBLE_SET(l,r)  ((l) = (l)&0xf0 | (r))
#define HIGH_BYTE(x) ((x) >> 8)
#define LOW_BYTE(x) ((x) & 0xff)
#define FORM_WORD(h,l) (((int)(h))<<8 | (l))

#endif