include/bcd.h

   1 /* Permission is hereby granted to copy, modify and redistribute this code
   2  * in terms of the GNU Library General Public License, Version 2 or later,
   3  * at your option.
   4  */
   5
   6 /* macros to translate to/from binary and binary-coded decimal (frequently
   7  * found in RTC chips).
   8  */
   9
  10 #ifndef _BCD_H
  11 #define _BCD_H
  12
  13 #define BCD2BIN(val)    (((val) & 0x0f) + ((val)>>4)*10)
  14 #define BIN2BCD(val)    ((((val)/10)<<4) + (val)%10)
  15
  16 /* backwards compat */
  17 #define BCD_TO_BIN(val) ((val)=BCD2BIN(val))
  18 #define BIN_TO_BCD(val) ((val)=BIN2BCD(val))
  19
  20 #endif /* _BCD_H */