79 lines
2.1 KiB
C++
79 lines
2.1 KiB
C++
/*
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* File: Circuit.cpp
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* Author: Christopher
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*
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* Created on December 12, 2013, 7:04 PM
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*/
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#include "Circuit.h"
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#include "trans.h"
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/*
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* Adds segment extendFrom, and all segments electrically connected to it.
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* This happens recursively, but we don't recurse past ground or voltage supply.
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*/
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void Circuit::extend(Segment* extendFrom) {
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auto ret = this->segs.insert(extendFrom);
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if (!ret.second) {
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/* We've already processed this segment. */
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return;
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}
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/* Don't recurse past ground or voltage supply. */
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if (extendFrom->vss || extendFrom->vcc) {
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return;
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}
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/*
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* For every ON transistor this seg is connected to via a leg (source or
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* drain), add the seg that's connected to the OTHER leg of the transistor.
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* This is a RECURSIVE addition.
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*
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* Also note that, upon system startup, all transistors are initialized
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* to OFF, so at the time of the very first recalcAll call, *no* other
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* segments will be added here.
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*/
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for (auto t : extendFrom->c1c2s) {
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if (t->on) {
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if (t->c1 == extendFrom) {
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extend(t->c2);
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} else if (t->c2 == extendFrom) {
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extend(t->c1);
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}
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}
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}
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}
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/*
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* Upon system startup, this will return the "pullup" value of
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* each segment, except for VCC and VSS (which will of course be
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* ON and OFF respectively).
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*/
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bool Circuit::getValue() {
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/* If group contains ground, it's OFF, */
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for (auto s : this->segs) {
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if (s->vss) {
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return false;
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}
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}
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/*
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* otherwise, if any segment in the group is not floating,
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* return that segment as the value, otherwise if any floating
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* segment is ON, then return ON as the value.
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*/
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for (auto s : this->segs) {
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if (s->pull != Pull::FLOAT) {
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return (s->pull == Pull::UP);
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} else if (s->on) {
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return true;
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}
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}
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/*
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* otherwise, if we get here, it means that all segments in the
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* group are floating and OFF, so return OFF as the value.
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*/
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return false;
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}
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