/*
  Copyright (c) 2011 Arduino.  All right reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef _WIRING_CONSTANTS_
#define _WIRING_CONSTANTS_

#include <stdbool.h>
#include <stdint.h>
#include "wiring_private.h"

#define HIGH          0x1
#define LOW           0x0
#define INPUT         0x0
#define OUTPUT        0x1
#define INPUT_PULLUP  0x2
#define NC            0xFFFFFFFF // Not connected

#define PI            3.1415926535897932384626433832795
#define HALF_PI       1.5707963267948966192313216916398
#define TWO_PI        6.283185307179586476925286766559
#define DEG_TO_RAD    0.017453292519943295769236907684886
#define RAD_TO_DEG    57.295779513082320876798154814105
#define EULER         2.718281828459045235360287471352

#define SERIAL        0x0
#define DISPLAY       0x1

enum BitOrder 
{
  LSBFIRST = 0,
  MSBFIRST = 1
};

// interrupts mode
#define CHANGE        0x2
#define FALLING       0x3
#define RISING        0x4

#define DEFAULT       1
#define EXTERNAL      0
#define NOT_AN_INTERRUPT -1

// Math
#include <stdlib.h>
// undefine stdlib's abs if encountered
#ifdef abs
#undef abs
#endif
#ifndef abs
  #define abs(x) ((x)>0?(x):-(x))
#endif // abs

#ifndef min
  #define min(a,b) ((a)<(b)?(a):(b))
#endif // min

#ifndef max
  #define max(a,b) ((a)>(b)?(a):(b))
#endif // max

#define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
#define radians(deg)  ((deg)*DEG_TO_RAD)
#define degrees(rad)  ((rad)*RAD_TO_DEG)
#define sq(x)         ((x)*(x))

// Bits and Bytes
#define _BV(bit)    (1 << (bit)) // from avr-gcc (some arduino libs uses it)
#define bit(b)      (1UL << (b))
#define lowByte(w)  ((uint8_t) ((w) & 0xff))
#define highByte(w) ((uint8_t) ((w) >> 8))

#define bitRead(value, bit)   (((value) >> (bit)) & 0x01)
#define bitSet(value, bit)    ((value) |= (1UL << (bit)))
#define bitClear(value, bit)  ((value) &= ~(1UL << (bit)))
#define bitWrite(value, bit, bitvalue) ((bitvalue) ? bitSet((value), (bit)) : bitClear((value), (bit) ))


// typedefs for compatibility
typedef unsigned int word;
typedef bool boolean __attribute__((deprecated));
typedef uint8_t byte ;

#endif /* _WIRING_CONSTANTS_ */