#ifndef COMMON_H
#define COMMON_H

#define SET(X, Y)   X |= (1 << Y)
#define CLR(X, Y)   X &= ~(1 << Y)
#define CHK(X, Y)   X & (1 << Y)
#define TOG(X, Y)   X ^= (1 << Y)

#endif /* COMMON_H */