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https://github.com/DCC-EX/CommandStation-EX.git
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105 lines
3.6 KiB
C++
105 lines
3.6 KiB
C++
/*
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* © 2024 Chris Harlow
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* All rights reserved.
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*
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* This file is part of CommandStation-EX
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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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/**********************************************************************
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EXRAILSensor represents a sensor that should be monitored in order
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to call an exrail ONBUTTON or ONCHANGE handler.
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These are created at EXRAIL startup and thus need no delete or listing
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capability.
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The basic logic is similar to that found in the Sensor class
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except that on the relevant change an EXRAIL thread is started.
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**********************************************************************/
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#include "EXRAILSensor.h"
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#include "EXRAIL2.h"
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void EXRAILSensor::checkAll() {
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if (firstSensor == NULL) return; // No sensors to be scanned
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if (readingSensor == NULL) {
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// Not currently scanning sensor list
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unsigned long thisTime = micros();
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if (thisTime - lastReadCycle < cycleInterval) return;
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// Required time has elapsed since last read cycle started,
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// so initiate new scan through the sensor list
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readingSensor = firstSensor;
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lastReadCycle = thisTime;
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}
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// Loop until either end of list is encountered or we pause for some reason
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byte sensorCount = 0;
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while (readingSensor != NULL) {
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bool pause=readingSensor->check();
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// Move to next sensor in list.
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readingSensor = readingSensor->nextSensor;
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// Currently process max of 16 sensors per entry.
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// Performance measurements taken during development indicate that, with 128 sensors configured
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// on 8x 16-pin MCP23017 GPIO expanders with polling (no change notification), all inputs can be read from the devices
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// within 1.4ms (400Mhz I2C bus speed), and a full cycle of checking 128 sensors for changes takes under a millisecond.
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if (pause || (++sensorCount)>=16) return;
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}
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}
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bool EXRAILSensor::check() {
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// check for debounced change in this sensor
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inputState = RMFT2::readSensor(pin);
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// Check if changed since last time, and process changes.
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if (inputState == active) {// no change
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latchDelay = minReadCount; // Reset counter
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return false; // no change
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}
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// Change detected ... has it stayed changed for long enough
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if (latchDelay > 0) {
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latchDelay--;
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return false;
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}
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// change validated, act on it.
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active = inputState;
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latchDelay = minReadCount; // Reset debounce counter
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if (onChange || active) {
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new RMFT2(progCounter);
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return true; // Don't check any more sensors on this entry
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}
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return false;
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}
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EXRAILSensor::EXRAILSensor(VPIN _pin, int _progCounter, bool _onChange) {
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// Add to the start of the list
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//DIAG(F("ONthing vpin=%d at %d"), _pin, _progCounter);
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nextSensor = firstSensor;
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firstSensor = this;
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pin=_pin;
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progCounter=_progCounter;
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onChange=_onChange;
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IODevice::configureInput(pin, true);
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active = IODevice::read(pin);
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inputState = active;
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latchDelay = minReadCount;
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}
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EXRAILSensor *EXRAILSensor::firstSensor=NULL;
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EXRAILSensor *EXRAILSensor::readingSensor=NULL;
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unsigned long EXRAILSensor::lastReadCycle=0;
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