bit.h

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#ifndef bit_h
#define bit_h
 
#define BIT(V, X)       (  !!(V &  (1 << X)))
#define SET_BIT(R, X)   (R = (R |  (1 << X)))
#define RESET_BIT(R, X) (R = (R & ~(1 << X)))
 
/* uses manual notation */
/* [ 4 | 3 | 2 | 1 ] for 16 bits and [ 2 | 1 ] for 8 bits */
#define NIBBLE_MASK(X)  (0xf << ((X-1)*4))
 
#endif