marlin/Marlin/macros.h

/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef MACROS_H
#define MACROS_H

#define NUM_AXIS 4
#define XYZE 4
#define ABC  3
#define XYZ  3

#define FORCE_INLINE __attribute__((always_inline)) inline

// Bracket code that shouldn't be interrupted
#ifndef CRITICAL_SECTION_START
  #define CRITICAL_SECTION_START  unsigned char _sreg = SREG; cli();
  #define CRITICAL_SECTION_END    SREG = _sreg;
#endif

// Clock speed factor
#define CYCLES_PER_MICROSECOND (F_CPU / 1000000UL) // 16 or 20

// Remove compiler warning on an unused variable
#define UNUSED(x) (void) (x)

// Macros to make a string from a macro
#define STRINGIFY_(M) #M
#define STRINGIFY(M) STRINGIFY_(M)

// Macros for bit masks
#define TEST(n,b) (((n)&_BV(b))!=0)
#define SBI(n,b) (n |= _BV(b))
#define CBI(n,b) (n &= ~_BV(b))
#define SET_BIT(n,b,value) (n) ^= ((-value)^(n)) & (_BV(b))

// Macros for maths shortcuts
#ifndef M_PI
  #define M_PI 3.14159265358979323846
#endif
#define RADIANS(d) ((d)*M_PI/180.0)
#define DEGREES(r) ((r)*180.0/M_PI)
#define HYPOT2(x,y) (sq(x)+sq(y))
#define HYPOT(x,y) sqrt(HYPOT2(x,y))

// Macros to contrain values
#define NOLESS(v,n) do{ if (v < n) v = n; }while(0)
#define NOMORE(v,n) do{ if (v > n) v = n; }while(0)

// Macros to support option testing
#define _CAT(a, ...) a ## __VA_ARGS__
#define SWITCH_ENABLED_false 0
#define SWITCH_ENABLED_true  1
#define SWITCH_ENABLED_0     0
#define SWITCH_ENABLED_1     1
#define SWITCH_ENABLED_      1
#define ENABLED(b) _CAT(SWITCH_ENABLED_, b)
#define DISABLED(b) (!_CAT(SWITCH_ENABLED_, b))

#define NUMERIC(a) ((a) >= '0' && '9' >= (a))
#define NUMERIC_SIGNED(a) (NUMERIC(a) || (a) == '-')
#define COUNT(a) (sizeof(a)/sizeof(*a))
#define ZERO(a) memset(a,0,sizeof(a))

// Macros for initializing arrays
#define ARRAY_6(v1, v2, v3, v4, v5, v6, ...) { v1, v2, v3, v4, v5, v6 }
#define ARRAY_5(v1, v2, v3, v4, v5, ...)     { v1, v2, v3, v4, v5 }
#define ARRAY_4(v1, v2, v3, v4, ...)         { v1, v2, v3, v4 }
#define ARRAY_3(v1, v2, v3, ...)             { v1, v2, v3 }
#define ARRAY_2(v1, v2, ...)                 { v1, v2 }
#define ARRAY_1(v1, ...)                     { v1 }

#define _ARRAY_N(N, ...) ARRAY_ ##N(__VA_ARGS__)
#define ARRAY_N(N, ...) _ARRAY_N(N, __VA_ARGS__)

// Macros for adding
#define INC_0 1
#define INC_1 2
#define INC_2 3
#define INC_3 4
#define INC_4 5
#define INC_5 6
#define INC_6 7
#define INC_7 8
#define INC_8 9
#define INCREMENT_(n) INC_ ##n
#define INCREMENT(n) INCREMENT_(n)

// Macros for subtracting
#define DEC_1 0
#define DEC_2 1
#define DEC_3 2
#define DEC_4 3
#define DEC_5 4
#define DEC_6 5
#define DEC_7 6
#define DEC_8 7
#define DEC_9 8
#define DECREMENT_(n) DEC_ ##n
#define DECREMENT(n) DECREMENT_(n)

#define PIN_EXISTS(PN) (defined(PN ##_PIN) && PN ##_PIN >= 0)

#define PENDING(NOW,SOON) ((long)(NOW-(SOON))<0)
#define ELAPSED(NOW,SOON) (!PENDING(NOW,SOON))

#define NOOP do{} while(0)

#define CEILING(x,y) (((x) + (y) - 1) / (y))

#define MAX3(a, b, c)    max(max(a, b), c)
#define MAX4(a, b, c, d) max(max(max(a, b), c), d)

#define UNEAR_ZERO(x) ((x) < 0.000001)
#define NEAR_ZERO(x) ((x) > -0.000001 && (x) < 0.000001)
#define NEAR(x,y) NEAR_ZERO((x)-(y))

#define RECIPROCAL(x) (NEAR_ZERO(x) ? 0.0 : 1.0 / (x))

#endif //__MACROS_H