mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
/*
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* © 2021 Neil McKechnie
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* © 2020-2021 Harald Barth
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* © 2020-2021 Chris Harlow
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* All rights reserved.
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*
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* This file is part of Asbelos DCC API
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef Sensor_h
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#define Sensor_h
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#include "Arduino.h"
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#include "IODevice.h"
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// Uncomment the following #define statement to use callback notification
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// where the driver supports it.
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// The principle of callback notification is to avoid the Sensor class
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// having to poll the device driver cyclically for input values, and then scan
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// for changes. Instead, when the driver scans the inputs, if it detects
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// a change it invokes a callback function in the Sensor class. In the current
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// implementation, the advantages are limited because (a) the Sensor class
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// performs debounce checks, and (b) the Sensor class does not have a
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// static reference to the output stream for sending <Q>/<q> messages
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// when a change is detected. These restrictions mean that the checkAll()
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// method still has to iterate through all of the Sensor objects looking
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// for changes.
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#define USE_NOTIFY
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struct SensorData {
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int snum;
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VPIN pin;
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uint8_t pullUp;
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};
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class Sensor{
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// The sensor list is a linked list where each sensor's 'nextSensor' field points to the next.
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// The pointer is null in the last on the list.
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public:
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SensorData data;
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struct {
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uint8_t active:1;
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uint8_t inputState:1;
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uint8_t latchDelay:6;
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}; // bit 7=active; bit 6=input state; bits 5-0=latchDelay
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static Sensor *firstSensor;
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#ifdef USE_NOTIFY
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static Sensor *firstPollSensor;
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static Sensor *lastSensor;
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#endif
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// readingSensor points to the next sensor to be polled, or null if the poll cycle is completed for
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// the period.
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static Sensor *readingSensor;
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// Constructor
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Sensor();
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Sensor *nextSensor;
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void setState(int state);
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#ifndef DISABLE_EEPROM
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static void load();
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static void store();
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#endif
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static Sensor *create(int id, VPIN vpin, int pullUp);
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static Sensor* get(int id);
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static bool remove(int id);
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static void checkAll();
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static void printAll(Print *stream);
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static unsigned long lastReadCycle; // value of micros at start of last read cycle
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static const unsigned int cycleInterval = 10000; // min time between consecutive reads of each sensor in microsecs.
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// should not be less than device scan cycle time.
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static const unsigned int minReadCount = 1; // number of additional scans before acting on change
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// E.g. 1 means that a change is ignored for one scan and actioned on the next.
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// Max value is 63
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bool pollingRequired = true;
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#ifdef USE_NOTIFY
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static void inputChangeCallback(VPIN vpin, int state);
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static bool inputChangeCallbackRegistered;
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#endif
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}; // Sensor
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#endif
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