File indexing completed on 2025-04-13 11:19:28

 /***************************************************************************
  *   Copyright (C) 2005 by David Saxton                                    *
  *   david@bluehaze.org                                                    *
  *                                                                         *
  *   This program 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 2 of the License, or     *
  *   (at your option) any later version.                                   *
  ***************************************************************************/
 
 #include <cmath>
 #include <stdlib.h> // for rand
 #include <time.h>
 
 #include <QTimer>
 
 #include "circuitdocument.h"
 #include "component.h"
 #include "ecnode.h"
 #include "pin.h"
 #include "resistance.h"
 #include "simulator.h"
 #include "switch.h"
 
 #include <ktechlab_debug.h>
 
 Switch::Switch(Component *parent, Pin *p1, Pin *p2, State state)
 {
     m_bouncePeriod_ms = 5;
     m_bBounce = false;
     m_bounceStart = 0;
     m_pBounceResistance = nullptr;
     m_pP1 = p1;
     m_pP2 = p2;
     m_pComponent = parent;
     m_pStopBouncingTimer = new QTimer(this);
     connect(m_pStopBouncingTimer, SIGNAL(timeout()), this, SLOT(stopBouncing()));
 
     // Force update
     m_state = (state == Open) ? Closed : Open;
     setState(state);
 }
 
 Switch::~Switch()
 {
     if (m_pP1)
         m_pP1->setSwitchConnected(m_pP2, false);
     if (m_pP2)
         m_pP2->setSwitchConnected(m_pP1, false);
 }
 
 void Switch::setState(State state)
 {
     if (m_state == state)
         return;
 
     m_state = state;
 
     if (m_bBounce)
         startBouncing();
     else {
         // I'm being lazy...calling stopBouncing will connect the stuff
         stopBouncing();
     }
 }
 
 void Switch::setBounce(bool bounce, int msec)
 {
     m_bBounce = bounce;
     m_bouncePeriod_ms = msec;
 }
 
 void Switch::startBouncing()
 {
     if (m_pBounceResistance) {
         // Already active?
         return;
     }
 
     if (!m_pComponent->circuitDocument())
         return;
 
     //  qCDebug(KTL_LOG);
 
     m_pBounceResistance = m_pComponent->createResistance(m_pP1, m_pP2, 10000);
     m_bounceStart = Simulator::self()->time();
 
     // FIXME: I broke the bounce feature when I cleaned this out of the simulator,
     // should probably be put into circuit document or some other solution which doesn't
     // contaminate that many other classes.
 
     //  Simulator::self()->attachSwitch( this );
     //  qCDebug(KTL_LOG) << "m_bounceStart="<<m_bounceStart<<" m_bouncePeriod_ms="<<m_bouncePeriod_ms;
 
     // initialize random generator
     srand(time(nullptr));
 
     // Give our bounce resistor an initial value
     bounce();
 }
 
 void Switch::bounce()
 {
     int bounced_ms = ((Simulator::self()->time() - m_bounceStart) * 1000) / LOGIC_UPDATE_RATE;
 
     if (bounced_ms >= m_bouncePeriod_ms) {
         if (!m_pStopBouncingTimer->isActive()) {
             m_pStopBouncingTimer->setSingleShot(true);
             m_pStopBouncingTimer->start(0 /*, true */);
         }
 
         return;
     }
 
     double g = double(rand()) / double(RAND_MAX);
 
     // 4th power of the conductance seems to give a nice distribution
     g = pow(g, 4);
     m_pBounceResistance->setConductance(g);
 }
 
 void Switch::stopBouncing()
 {
     //  Simulator::self()->detachSwitch( this );
     m_pComponent->removeElement(m_pBounceResistance, true);
     m_pBounceResistance = nullptr;
 
     bool connected = (m_state == Closed);
 
     if (m_pP1 && m_pP2) {
         m_pP1->setSwitchConnected(m_pP2, connected);
         m_pP2->setSwitchConnected(m_pP1, connected);
     }
 
     if (CircuitDocument *cd = m_pComponent->circuitDocument())
         cd->requestAssignCircuits();
 }
 
 bool Switch::calculateCurrent()
 {
     if (!m_pP1 || !m_pP2)
         return false;
 
     if (state() == Open) {
         m_pP1->setSwitchCurrentKnown(this);
         m_pP2->setSwitchCurrentKnown(this);
         return true;
     }
 
     Pin *pins[2] = {m_pP1, m_pP2};
 
     double current = 0.0;
     bool currentKnown = false;
     int pol;
 
     for (unsigned i = 0; i < 2; ++i) {
         pol = (i == 0) ? 1 : -1;
 
         const WireList inputs = pins[i]->inputWireList();
         const WireList outputs = pins[i]->outputWireList();
 
         currentKnown = true;
         current = 0.0;
 
         WireList::const_iterator end = inputs.end();
 
         for (WireList::const_iterator it = inputs.begin(); it != end; ++it) {
             if (!(*it))
                 continue;
 
             if (!(*it)->currentIsKnown()) {
                 currentKnown = false;
                 break;
             }
 
             current += (*it)->current();
         }
 
         if (!currentKnown)
             continue;
 
         end = outputs.end();
 
         for (WireList::const_iterator it = outputs.begin(); it != end; ++it) {
             if (!(*it))
                 continue;
 
             if (!(*it)->currentIsKnown()) {
                 currentKnown = false;
                 break;
             }
 
             current -= (*it)->current();
         }
 
         if (currentKnown)
             break;
     }
 
     if (!currentKnown)
         return false;
 
     m_pP1->setSwitchCurrentKnown(this);
     m_pP2->setSwitchCurrentKnown(this);
     m_pP1->mergeCurrent(-current * pol);
     m_pP2->mergeCurrent(current * pol);
 
     return true;
 }
 
 #include "moc_switch.cpp"