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https://github.com/RobTillaart/Arduino.git
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108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
#pragma once
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//
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// FILE: fast_math.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.1
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// PURPOSE: Arduino library for fast math algorithms
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// DATE: 27 October 2013
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// URL: https://github.com/RobTillaart/fast_math
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#ifdef ESP_PLATFORM
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#include <math.h>
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#include <stdint.h>
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#include <stdbool.h>
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#else
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#include "Arduino.h"
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#endif
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#define FASTMATH_LIB_VERSION (F("0.2.1"))
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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//////////////////////////////////////////////////////////////////////////
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//
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// ROUTINE: divmod10
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// PURPOSE: fast routine that provides both / 10 and % 10 for integer math.
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// URL: https://forum.arduino.cc/t/divmod10-a-fast-replacement-for-10-and-10-unsigned/163586
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// AUTHORS: see URL
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// NOTE: assembler version for AVR exists (by Stimmer) - see URL
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//
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void divmod10(uint32_t in, uint32_t *div, uint8_t *mod);
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void divmod3(uint32_t in, uint32_t *div, uint8_t *mod);
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void divmod5(uint32_t in, uint32_t *div, uint8_t *mod);
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// for clocks
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void divmod12(uint32_t in, uint32_t *div, uint8_t *mod);
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void divmod24(uint32_t in, uint32_t *div, uint8_t *mod);
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void divmod60(uint32_t in, uint32_t *div, uint8_t *mod);
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//////////////////////////////////////////////////////////////////////////
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//
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// ROUTINE: dec2bcd and bcd2dec
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// PURPOSE: conversion
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//
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uint8_t dec2bcdRef(uint8_t value); // reference implementation.
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uint8_t dec2bcd(uint8_t value);
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uint8_t dec2bcdRTC(uint8_t value);
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uint8_t bcd2decRef(uint8_t value);
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uint8_t bcd2dec(uint8_t value);
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//////////////////////////////////////////////////////////////////////////
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//
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// ROUTINE: polynome
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// PURPOSE: routine to evaluate a polynome and be able to change weights runtime.
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//
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// assumes degree >= 1, and ar[0] exists, and could be 0.
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//
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// e.g y = 3x^2 + 5x + 7 ==> ar[] = { 7, 5, 3 }; degree = 2;
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//
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float polynome(float x, float ar[], uint8_t degree);
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//////////////////////////////////////////////////////////////////////////
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//
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// 16 BIT PING MATH - for distances up to ~10 meter
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//
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//////////////////////////////////////////////////////////
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//
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// ROUTINE: ping2cm
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// PURPOSE: fast routines to calculate the distance in cm / mm for a ping sensor
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//
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uint16_t ping2cm(uint16_t in);
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uint16_t ping2mm(uint16_t in); // smaller units are more accurate.
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uint16_t ping2inch(uint16_t in);
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uint16_t ping2quarter(uint16_t in);
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uint16_t ping2sixteenths(uint16_t in);
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//////////////////////////////////////////////////////////
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//
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// 32 BIT PING MATH - for distances > 10 meter (gaim ~10%)
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//
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uint32_t ping2cm32(uint32_t in);
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uint32_t ping2mm32(uint32_t in);
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// temperature compensated speed of sound distance
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float ping2cm_tempC(uint16_t duration, int Celsius);
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float ping2inch_tempC(uint16_t duration, int Celsius);
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float ping2inch_tempF(uint16_t duration, int Fahrenheit);
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#ifdef __cplusplus
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}
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#endif
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// -- END OF FILE --
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