metal.h

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#ifndef __METAL_H
#define __METAL_H
 
#include <stdint.h>
#include <stddef.h>
 
/* ================ Memory register attributes ================ */
#ifdef __cplusplus
  #define   __I     volatile             
#else
  #define   __I     volatile const       
#endif
#define     __O     volatile             
#define     __IO    volatile             
/* following defines should be used for structure members */
#define     __IM     volatile const      
#define     __OM     volatile            
#define     __IOM    volatile            
/* ================ Bit Operation definitions ================ */
#define SET_BITS(REG, BIT)                    ((REG) |= (BIT))
#define CLEAR_BITS(REG, BIT)                  ((REG) &= ~(BIT))
#define READ_BITS(REG, BIT)                   ((REG) & (BIT))
#define WRITE_BITS(REG, CLEARMASK, SETMASK)   ((REG) = (((REG) & (~(CLEARMASK))) | (SETMASK)))
 
 
/* ================ Common definitions ================ */
typedef enum {
  RESET = 0UL,
  SET   = !RESET,
 
  DISABLE = RESET,
  ENABLE  = SET,
  
  LOW   = RESET,
  HIGH  = SET,
} State;
 
typedef enum {
  OK = 0U,
  ERROR,
  BUSY,
  TIMEOUT
} Status;
 
#endif /* __METAL_H */