WMath.cpp

/* -*- mode: jde; c-basic-offset: 2; indent-tabs-mode: nil -*- */

/*
 Part of the Wiring project - http://wiring.org.co
 Copyright (c) 2004-06 Hernando Barragan
 Modified 13 August 2006, David A. Mellis for Arduino - http://www.arduino.cc/

 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., 59 Temple Place, Suite 330,
 Boston, MA 02111-1307 USA

 $Id$
*/

extern"C" {
#include<stdlib.h>
#include"esp_system.h"
}
#include"esp32-hal-log.h"
#include"esp_random.h"

// Allows the user to choose between Real Hardware
// or Software Pseudo random generators for the
// Arduino random() functions
staticbool s_useRandomHW = true;
voiduseRealRandomGenerator(bool useRandomHW) {
 s_useRandomHW = useRandomHW;
}

// Calling randomSeed() will force the
// Pseudo Random generator like in
// Arduino mainstream API
voidrandomSeed(unsignedlong seed) {
if (seed != 0) {
srand(seed);
 s_useRandomHW = false;
 }
}

longrandom(long howsmall, long howbig);
longrandom(long howbig) {
if (howbig == 0) {
return0;
 }
if (howbig < 0) {
return (random(0, -howbig));
 }
// if randomSeed was called, fall back to software PRNG
uint32_t val = (s_useRandomHW) ? esp_random() : rand();
return val % howbig;
}

longrandom(long howsmall, long howbig) {
if (howsmall >= howbig) {
return howsmall;
 }
long diff = howbig - howsmall;
returnrandom(diff) + howsmall;
}

longmap(long x, long in_min, long in_max, long out_min, long out_max) {
constlong run = in_max - in_min;
if (run == 0) {
log_e("map(): Invalid input range, min == max");
return -1; // AVR returns -1, SAM returns 0
 }
constlong rise = out_max - out_min;
constlong delta = x - in_min;
return (delta * rise) / run + out_min;
}

uint16_tmakeWord(uint16_t w) {
return w;
}

uint16_tmakeWord(uint8_t h, uint8_t l) {
return (h << 8) | l;
}