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Tasmota/lib/NewPing-1.9.1/src/NewPing.h

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// ---------------------------------------------------------------------------
// NewPing Library - v1.9.1 - 07/15/2018
//
// AUTHOR/LICENSE:
// Created by Tim Eckel - teckel@leethost.com
// Copyright 2018 License: Forks and derivitive works are NOT permitted without
// permission. Permission is only granted to use as-is for private and
// commercial use. If you wish to contribute, make changes, or enhancements,
// please create a pull request. I get a TON of support issues from this
// library, most of which comes from old versions, buggy forks or sites without
// proper documentation, just trying to wrangle this project together.
//
// LINKS:
// Project home: https://bitbucket.org/teckel12/arduino-new-ping/wiki/Home
// Blog: http://arduino.cc/forum/index.php/topic,106043.0.html
//
// DISCLAIMER:
// This software is furnished "as is", without technical support, and with no
// warranty, express or implied, as to its usefulness for any purpose.
//
// BACKGROUND:
// When I first received an ultrasonic sensor I was not happy with how poorly
// it worked. Quickly I realized the problem wasn't the sensor, it was the
// available ping and ultrasonic libraries causing the problem. The NewPing
// library totally fixes these problems, adds many new features, and breaths
// new life into these very affordable distance sensors.
//
// FEATURES:
// * Works with many different ultrasonic sensors: SR04, SRF05, SRF06, DYP-ME007, URM37 & Parallax PING)))™.
// * Compatible with the entire Arduino line-up (and clones), Teensy family (including $19.80 96Mhz 32 bit Teensy 3.2) and non-AVR microcontrollers.
// * Interface with all but the SRF06 sensor using only one Arduino pin.
// * Doesn't lag for a full second if no ping/echo is received.
// * Ping sensors consistently and reliably at up to 30 times per second.
// * Timer interrupt method for event-driven sketches.
// * Built-in digital filter method ping_median() for easy error correction.
// * Uses port registers for a faster pin interface and smaller code size.
// * Allows you to set a maximum distance where pings beyond that distance are read as no ping "clear".
// * Ease of using multiple sensors (example sketch with 15 sensors).
// * More accurate distance calculation (cm, inches & uS).
// * Doesn't use pulseIn, which is slow and gives incorrect results with some ultrasonic sensor models.
// * Actively developed with features being added and bugs/issues addressed.
//
// CONSTRUCTOR:
// NewPing sonar(trigger_pin, echo_pin [, max_cm_distance])
// trigger_pin & echo_pin - Arduino pins connected to sensor trigger and echo.
// NOTE: To use the same Arduino pin for trigger and echo, specify the same pin for both values.
// max_cm_distance - [Optional] Maximum distance you wish to sense. Default=500cm.
//
// METHODS:
// sonar.ping([max_cm_distance]) - Send a ping and get the echo time (in microseconds) as a result. [max_cm_distance] allows you to optionally set a new max distance.
// sonar.ping_in([max_cm_distance]) - Send a ping and get the distance in whole inches. [max_cm_distance] allows you to optionally set a new max distance.
// sonar.ping_cm([max_cm_distance]) - Send a ping and get the distance in whole centimeters. [max_cm_distance] allows you to optionally set a new max distance.
// sonar.ping_median(iterations [, max_cm_distance]) - Do multiple pings (default=5), discard out of range pings and return median in microseconds. [max_cm_distance] allows you to optionally set a new max distance.
// NewPing::convert_in(echoTime) - Convert echoTime from microseconds to inches (rounds to nearest inch).
// NewPing::convert_cm(echoTime) - Convert echoTime from microseconds to centimeters (rounds to nearest cm).
// sonar.ping_timer(function [, max_cm_distance]) - Send a ping and call function to test if ping is complete. [max_cm_distance] allows you to optionally set a new max distance.
// sonar.check_timer() - Check if ping has returned within the set distance limit.
// NewPing::timer_us(frequency, function) - Call function every frequency microseconds.
// NewPing::timer_ms(frequency, function) - Call function every frequency milliseconds.
// NewPing::timer_stop() - Stop the timer.
//
// HISTORY:
// 07/15/2018 v1.9.1 - Added support for ATtiny441 and ATtiny841
// microcontrollers.
// 12/09/2017 v1.9.0 - Added support for the ARM-based Particle devices. If
// other ARM-based microcontrollers adopt a similar timer method that the
// Particle and Teensy 3.x share, support for other ARM-based microcontrollers
// could be possible. Attempt to add to Arduino library manager. License
// changed.
// 07/30/2016 v1.8 - Added support for non-AVR microcontrollers. For non-AVR
// microcontrollers, advanced ping_timer() timer methods are disabled due to
// inconsistencies or no support at all between platforms. However, standard
// ping methods are all supported. Added new optional variable to ping(),
// ping_in(), ping_cm(), ping_median(), and ping_timer() methods which allows
// you to set a new maximum distance for each ping. Added support for the
// ATmega16, ATmega32 and ATmega8535 microcontrollers. Changed convert_cm()
// and convert_in() methods to static members. You can now call them without
// an object. For example: cm = NewPing::convert_cm(distance);
//
// 09/29/2015 v1.7 - Removed support for the Arduino Due and Zero because
// they're both 3.3 volt boards and are not 5 volt tolerant while the HC-SR04
// is a 5 volt sensor. Also, the Due and Zero don't support pin manipulation
// compatibility via port registers which can be done (see the Teensy 3.2).
//
// 06/17/2014 v1.6 - Corrected delay between pings when using ping_median()
// method. Added support for the URM37 sensor (must change URM37_ENABLED from
// false to true). Added support for Arduino microcontrollers like the $20
// 32 bit ARM Cortex-M4 based Teensy 3.2. Added automatic support for the
// Atmel ATtiny family of microcontrollers. Added timer support for the
// ATmega8 microcontroller. Rounding disabled by default, reduces compiled
// code size (can be turned on with ROUNDING_ENABLED switch). Added
// TIMER_ENABLED switch to get around compile-time "__vector_7" errors when
// using the Tone library, or you can use the toneAC, NewTone or
// TimerFreeTone libraries: https://bitbucket.org/teckel12/arduino-toneac/
// Other speed and compiled size optimizations.
//
// 08/15/2012 v1.5 - Added ping_median() method which does a user specified
// number of pings (default=5) and returns the median ping in microseconds
// (out of range pings ignored). This is a very effective digital filter.
// Optimized for smaller compiled size (even smaller than sketches that
// don't use a library).
//
// 07/14/2012 v1.4 - Added support for the Parallax PING)))<29> sensor. Interface
// with all but the SRF06 sensor using only one Arduino pin. You can also
// interface with the SRF06 using one pin if you install a 0.1uf capacitor
// on the trigger and echo pins of the sensor then tie the trigger pin to
// the Arduino pin (doesn't work with Teensy). To use the same Arduino pin
// for trigger and echo, specify the same pin for both values. Various bug
// fixes.
//
// 06/08/2012 v1.3 - Big feature addition, event-driven ping! Uses Timer2
// interrupt, so be mindful of PWM or timing conflicts messing with Timer2
// may cause (namely PWM on pins 3 & 11 on Arduino, PWM on pins 9 and 10 on
// Mega, and Tone library). Simple to use timer interrupt functions you can
// use in your sketches totally unrelated to ultrasonic sensors (don't use if
// you're also using NewPing's ping_timer because both use Timer2 interrupts).
// Loop counting ping method deleted in favor of timing ping method after
// inconsistent results kept surfacing with the loop timing ping method.
// Conversion to cm and inches now rounds to the nearest cm or inch. Code
// optimized to save program space and fixed a couple minor bugs here and
// there. Many new comments added as well as line spacing to group code
// sections for better source readability.
//
// 05/25/2012 v1.2 - Lots of code clean-up thanks to Arduino Forum members.
// Rebuilt the ping timing code from scratch, ditched the pulseIn code as it
// doesn't give correct results (at least with ping sensors). The NewPing
// library is now VERY accurate and the code was simplified as a bonus.
// Smaller and faster code as well. Fixed some issues with very close ping
// results when converting to inches. All functions now return 0 only when
// there's no ping echo (out of range) and a positive value for a successful
// ping. This can effectively be used to detect if something is out of range
// or in-range and at what distance. Now compatible with Arduino 0023.
//
// 05/16/2012 v1.1 - Changed all I/O functions to use low-level port registers
// for ultra-fast and lean code (saves from 174 to 394 bytes). Tested on both
// the Arduino Uno and Teensy 2.0 but should work on all Arduino-based
// platforms because it calls standard functions to retrieve port registers
// and bit masks. Also made a couple minor fixes to defines.
//
// 05/15/2012 v1.0 - Initial release.
// ---------------------------------------------------------------------------
#ifndef NewPing_h
#define NewPing_h
#if defined (ARDUINO) && ARDUINO >= 100
#include <Arduino.h>
#else
#include <WProgram.h>
#if defined (PARTICLE)
#include <SparkIntervalTimer.h>
#else
#include <pins_arduino.h>
#endif
#endif
#if defined (__AVR__)
#include <avr/io.h>
#include <avr/interrupt.h>
#endif
// Shouldn't need to change these values unless you have a specific need to do so.
#define MAX_SENSOR_DISTANCE 500 // Maximum sensor distance can be as high as 500cm, no reason to wait for ping longer than sound takes to travel this distance and back. Default=500
#define US_ROUNDTRIP_CM 57 // Microseconds (uS) it takes sound to travel round-trip 1cm (2cm total), uses integer to save compiled code space. Default=57
#define US_ROUNDTRIP_IN 146 // Microseconds (uS) it takes sound to travel round-trip 1 inch (2 inches total), uses integer to save compiled code space. Defalult=146
#define ONE_PIN_ENABLED true // Set to "false" to disable one pin mode which saves around 14-26 bytes of binary size. Default=true
#define ROUNDING_ENABLED false // Set to "true" to enable distance rounding which also adds 64 bytes to binary size. Default=false
#define URM37_ENABLED false // Set to "true" to enable support for the URM37 sensor in PWM mode. Default=false
#define TIMER_ENABLED true // Set to "false" to disable the timer ISR (if getting "__vector_7" compile errors set this to false). Default=true
// Probably shouldn't change these values unless you really know what you're doing.
#define NO_ECHO 0 // Value returned if there's no ping echo within the specified MAX_SENSOR_DISTANCE or max_cm_distance. Default=0
#define MAX_SENSOR_DELAY 5800 // Maximum uS it takes for sensor to start the ping. Default=5800
#define ECHO_TIMER_FREQ 24 // Frequency to check for a ping echo (every 24uS is about 0.4cm accuracy). Default=24
#define PING_MEDIAN_DELAY 29000 // Microsecond delay between pings in the ping_median method. Default=29000
#define PING_OVERHEAD 5 // Ping overhead in microseconds (uS). Default=5
#define PING_TIMER_OVERHEAD 13 // Ping timer overhead in microseconds (uS). Default=13
#if URM37_ENABLED == true
#undef US_ROUNDTRIP_CM
#undef US_ROUNDTRIP_IN
#define US_ROUNDTRIP_CM 50 // Every 50uS PWM signal is low indicates 1cm distance. Default=50
#define US_ROUNDTRIP_IN 127 // If 50uS is 1cm, 1 inch would be 127uS (50 x 2.54 = 127). Default=127
#endif
// Conversion from uS to distance (round result to nearest cm or inch).
#define NewPingConvert(echoTime, conversionFactor) (max(((unsigned int)echoTime + conversionFactor / 2) / conversionFactor, (echoTime ? 1 : 0)))
// Detect non-AVR microcontrollers (Teensy 3.x, Arduino DUE, etc.) and don't use port registers or timer interrupts as required.
#if (defined (__arm__) && (defined (TEENSYDUINO) || defined (PARTICLE)))
#undef PING_OVERHEAD
#define PING_OVERHEAD 1
#undef PING_TIMER_OVERHEAD
#define PING_TIMER_OVERHEAD 1
#define DO_BITWISE true
#elif !defined (__AVR__)
#undef PING_OVERHEAD
#define PING_OVERHEAD 1
#undef PING_TIMER_OVERHEAD
#define PING_TIMER_OVERHEAD 1
#undef TIMER_ENABLED
#define TIMER_ENABLED false
#define DO_BITWISE false
#else
#define DO_BITWISE true
#endif
// Disable the timer interrupts when using ATmega128 and all ATtiny microcontrollers.
#if defined (__AVR_ATmega128__) || defined (__AVR_ATtiny24__) || defined (__AVR_ATtiny44__) || defined (__AVR_ATtiny441__) || defined (__AVR_ATtiny84__) || defined (__AVR_ATtiny841__) || defined (__AVR_ATtiny25__) || defined (__AVR_ATtiny45__) || defined (__AVR_ATtiny85__) || defined (__AVR_ATtiny261__) || defined (__AVR_ATtiny461__) || defined (__AVR_ATtiny861__) || defined (__AVR_ATtiny43U__)
#undef TIMER_ENABLED
#define TIMER_ENABLED false
#endif
// Define timers when using ATmega8, ATmega16, ATmega32 and ATmega8535 microcontrollers.
#if defined (__AVR_ATmega8__) || defined (__AVR_ATmega16__) || defined (__AVR_ATmega32__) || defined (__AVR_ATmega8535__)
#define OCR2A OCR2
#define TIMSK2 TIMSK
#define OCIE2A OCIE2
#endif
class NewPing {
public:
NewPing(uint8_t trigger_pin, uint8_t echo_pin, unsigned int max_cm_distance = MAX_SENSOR_DISTANCE);
unsigned int ping(unsigned int max_cm_distance = 0);
unsigned long ping_cm(unsigned int max_cm_distance = 0);
unsigned long ping_in(unsigned int max_cm_distance = 0);
unsigned long ping_median(uint8_t it = 5, unsigned int max_cm_distance = 0);
static unsigned int convert_cm(unsigned int echoTime);
static unsigned int convert_in(unsigned int echoTime);
#if TIMER_ENABLED == true
void ping_timer(void (*userFunc)(void), unsigned int max_cm_distance = 0);
boolean check_timer();
unsigned long ping_result;
static void timer_us(unsigned int frequency, void (*userFunc)(void));
static void timer_ms(unsigned long frequency, void (*userFunc)(void));
static void timer_stop();
#endif
private:
boolean ping_trigger();
void set_max_distance(unsigned int max_cm_distance);
#if TIMER_ENABLED == true
boolean ping_trigger_timer(unsigned int trigger_delay);
boolean ping_wait_timer();
static void timer_setup();
static void timer_ms_cntdwn();
#endif
#if DO_BITWISE == true
uint8_t _triggerBit;
uint8_t _echoBit;
#if defined(PARTICLE)
#if !defined(portModeRegister)
#if defined (STM32F10X_MD)
#define portModeRegister(port) ( &(port->CRL) )
#elif defined (STM32F2XX)
#define portModeRegister(port) ( &(port->MODER) )
#endif
#endif
volatile uint32_t *_triggerOutput;
volatile uint32_t *_echoInput;
volatile uint32_t *_triggerMode;
#else
volatile uint8_t *_triggerOutput;
volatile uint8_t *_echoInput;
volatile uint8_t *_triggerMode;
#endif
#else
uint8_t _triggerPin;
uint8_t _echoPin;
#endif
unsigned int _maxEchoTime;
unsigned long _max_time;
};
#endif
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