mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-11-24 00:26:13 +01:00
105 lines
3.6 KiB
C++
105 lines
3.6 KiB
C++
/*
|
|
* © 2024 Chris Harlow
|
|
* All rights reserved.
|
|
*
|
|
* This file is part of CommandStation-EX
|
|
*
|
|
* This is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* It 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/**********************************************************************
|
|
EXRAILSensor represents a sensor that should be monitored in order
|
|
to call an exrail ONBUTTON or ONCHANGE handler.
|
|
These are created at EXRAIL startup and thus need no delete or listing
|
|
capability.
|
|
The basic logic is similar to that found in the Sensor class
|
|
except that on the relevant change an EXRAIL thread is started.
|
|
**********************************************************************/
|
|
|
|
#include "EXRAILSensor.h"
|
|
#include "EXRAIL2.h"
|
|
|
|
void EXRAILSensor::checkAll() {
|
|
if (firstSensor == NULL) return; // No sensors to be scanned
|
|
if (readingSensor == NULL) {
|
|
// Not currently scanning sensor list
|
|
unsigned long thisTime = micros();
|
|
if (thisTime - lastReadCycle < cycleInterval) return;
|
|
// Required time has elapsed since last read cycle started,
|
|
// so initiate new scan through the sensor list
|
|
readingSensor = firstSensor;
|
|
lastReadCycle = thisTime;
|
|
}
|
|
|
|
// Loop until either end of list is encountered or we pause for some reason
|
|
byte sensorCount = 0;
|
|
|
|
while (readingSensor != NULL) {
|
|
bool pause=readingSensor->check();
|
|
// Move to next sensor in list.
|
|
readingSensor = readingSensor->nextSensor;
|
|
// Currently process max of 16 sensors per entry.
|
|
// Performance measurements taken during development indicate that, with 128 sensors configured
|
|
// on 8x 16-pin MCP23017 GPIO expanders with polling (no change notification), all inputs can be read from the devices
|
|
// within 1.4ms (400Mhz I2C bus speed), and a full cycle of checking 128 sensors for changes takes under a millisecond.
|
|
if (pause || (++sensorCount)>=16) return;
|
|
}
|
|
}
|
|
|
|
bool EXRAILSensor::check() {
|
|
// check for debounced change in this sensor
|
|
inputState = RMFT2::readSensor(pin);
|
|
|
|
// Check if changed since last time, and process changes.
|
|
if (inputState == active) {// no change
|
|
latchDelay = minReadCount; // Reset counter
|
|
return false; // no change
|
|
}
|
|
|
|
// Change detected ... has it stayed changed for long enough
|
|
if (latchDelay > 0) {
|
|
latchDelay--;
|
|
return false;
|
|
}
|
|
|
|
// change validated, act on it.
|
|
active = inputState;
|
|
latchDelay = minReadCount; // Reset debounce counter
|
|
if (onChange || active) {
|
|
new RMFT2(progCounter);
|
|
return true; // Don't check any more sensors on this entry
|
|
}
|
|
return false;
|
|
}
|
|
|
|
EXRAILSensor::EXRAILSensor(VPIN _pin, int _progCounter, bool _onChange) {
|
|
// Add to the start of the list
|
|
//DIAG(F("ONthing vpin=%d at %d"), _pin, _progCounter);
|
|
nextSensor = firstSensor;
|
|
firstSensor = this;
|
|
|
|
pin=_pin;
|
|
progCounter=_progCounter;
|
|
onChange=_onChange;
|
|
|
|
IODevice::configureInput(pin, true);
|
|
active = IODevice::read(pin);
|
|
inputState = active;
|
|
latchDelay = minReadCount;
|
|
}
|
|
|
|
EXRAILSensor *EXRAILSensor::firstSensor=NULL;
|
|
EXRAILSensor *EXRAILSensor::readingSensor=NULL;
|
|
unsigned long EXRAILSensor::lastReadCycle=0;
|