teensy-core-4.1/include/wiring.h

/* Teensyduino Core Library
 * http://www.pjrc.com/teensy/
 * Copyright (c) 2017 PJRC.COM, LLC.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * 1. The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * 2. If the Software is incorporated into a build system that allows
 * selection among a list of target devices, then similar target
 * devices manufactured by PJRC.COM must be included in the list of
 * target devices and selectable in the same manner.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef Wiring_h
#define Wiring_h

#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include "binary.h"
#include "core_id.h"
#include "core_pins.h"

// type_traits interferes with min() and other defines
// include it early, so we can define these later
// for Arduino compatibility
#ifdef __cplusplus
#include <type_traits>
// when the input number is an integer type, do all math as 32 bit signed long
template <class T, class A, class B, class C, class D>
long map(T _x, A _in_min, B _in_max, C _out_min, D _out_max, typename std::enable_if<std::is_integral<T>::value >::type* = 0)
{
	long x = _x, in_min = _in_min, in_max = _in_max, out_min = _out_min, out_max = _out_max;
	// Arduino's traditional algorithm
#if 0
	return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
#endif
#if 0
	// st42's suggestion: https://github.com/arduino/Arduino/issues/2466#issuecomment-69873889
	if ((in_max - in_min) > (out_max - out_min)) {
		return (x - in_min) * (out_max - out_min+1) / (in_max - in_min+1) + out_min;
	} else {
		return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
	}
#endif
	// first compute the ranges and check if input doesn't matter
	long in_range = in_max - in_min;
	long out_range = out_max - out_min;
	if (in_range == 0) return out_min + out_range / 2;
	// compute the numerator
	long num = (x - in_min) * out_range;
	// before dividing, add extra for proper round off (towards zero)
	if (out_range >= 0) {
		num += in_range / 2;
	} else {
		num -= in_range / 2;
	}
	// divide by input range and add output offset to complete map() compute
	long result = num / in_range + out_min;
	// fix "a strange behaviour with negative numbers" (see ArduinoCore-API issue #51)
	//   this step can be deleted if you don't care about non-linear output
	//   behavior extrapolating slightly beyond the mapped input & output range
	if (out_range >= 0) {
		if (in_range * num < 0) return result - 1;
	} else {
		if (in_range * num >= 0) return result + 1;
	}
	return result;
	// more conversation:
	// https://forum.pjrc.com/threads/44503-map()-function-improvements
}
// when the input is a float or double, do all math using the input's type
template <class T, class A, class B, class C, class D>
T map(T x, A in_min, B in_max, C out_min, D out_max, typename std::enable_if<std::is_floating_point<T>::value >::type* = 0)
{
	return (x - (T)in_min) * ((T)out_max - (T)out_min) / ((T)in_max - (T)in_min) + (T)out_min;
}
//#include <algorithm> // this isn't really needed, is it?  (slows down compiling)
#include <utility>
// https://forum.pjrc.com/threads/44596-Teensyduino-1-37-Beta-2-(Arduino-1-8-3-support)?p=145150&viewfull=1#post145150
template<class A, class B>
constexpr auto min(A&& a, B&& b) -> decltype(a < b ? std::forward<A>(a) : std::forward<B>(b)) {
  return a < b ? std::forward<A>(a) : std::forward<B>(b);
}
template<class A, class B>
constexpr auto max(A&& a, B&& b) -> decltype(a < b ? std::forward<A>(a) : std::forward<B>(b)) {
  return a >= b ? std::forward<A>(a) : std::forward<B>(b);
}
#else // not C++
#define min(a, b) ({ \
  typeof(a) _a = (a); \
  typeof(b) _b = (b); \
  (_a < _b) ? _a : _b; \
})
#define max(a, b) ({ \
  typeof(a) _a = (a); \
  typeof(b) _b = (b); \
  (_a > _b) ? _a : _b; \
})
#endif


#ifdef PI
#undef PI
#endif
#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

#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795
#endif
#ifndef M_SQRT2
#define M_SQRT2 1.4142135623730950488016887
#endif

#define SERIAL  0
#define DISPLAY 1

// undefine stdlib's abs if encountered
#ifdef abs
#undef abs
#endif

#if __cplusplus >= 201103L && defined(__STRICT_ANSI__)
#define typeof(a) decltype(a)
#endif

#if !defined(__cplusplus) || __cplusplus < 201703L
#define abs(x) ({ \
  typeof(x) _x = (x); \
  (_x > 0) ? _x : -_x; \
})
#define round(x) ({ \
  typeof(x) _x = (x); \
  (_x>=0) ? (long)(_x+0.5) : (long)(_x-0.5); \
})
#endif /* __cplusplus < 201703L */

#define constrain(amt, low, high) ({ \
  typeof(amt) _amt = (amt); \
  typeof(low) _low = (low); \
  typeof(high) _high = (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) ({ \
  typeof(x) _x = (x); \
  _x * _x; \
})

#ifdef __cplusplus
extern "C"{
#endif

extern double exp10(double x);
extern float exp10f(float x);
extern long double exp10l(long double x);
extern double pow10(double x);
extern float pow10f(float x);
extern long double pow10l(long double x);

#define stricmp(a, b) strcasecmp(a, b)

#define sei() __enable_irq()
#define cli() __disable_irq()
#define interrupts() __enable_irq()
#define noInterrupts() __disable_irq()

#define clockCyclesPerMicrosecond() ( F_CPU_ACTUAL / 1000000L )
#define clockCyclesToMicroseconds(a) ( (a) / clockCyclesPerMicrosecond() )
#define microsecondsToClockCycles(a) ( (a) * clockCyclesPerMicrosecond() )

#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)))

typedef unsigned int word;

#define bit(b) (1UL << (b))

typedef uint8_t byte;

uint32_t pulseIn(uint8_t pin, uint8_t state, uint32_t timeout);
void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, byte val);

void setup(void);
void loop(void);

void *extmem_malloc(size_t size);
void extmem_free(void *ptr);
void *extmem_calloc(size_t nmemb, size_t size);
void *extmem_realloc(void *ptr, size_t size);

#ifdef __cplusplus
} // extern "C"
#endif

// fix C++ boolean issue
// https://github.com/arduino/Arduino/pull/2151
#ifdef __cplusplus
typedef bool boolean;
#else
typedef uint8_t boolean;
#endif

#endif