PhaseCompElm.java

import java.awt.*;
import java.util.StringTokenizer;

class PhaseCompElm extends ChipElm {
    public PhaseCompElm(int xx, int yy) { super(xx, yy); }
    public PhaseCompElm(int xa, int ya, int xb, int yb, int f,
			StringTokenizer st) {
	super(xa, ya, xb, yb, f, st);
    }
    String getChipName() { return "phase comparator"; }
    void setupPins() {
	sizeX = 2;
	sizeY = 2;
	pins = new Pin[3];
	pins[0] = new Pin(0, SIDE_W, "I1");
	pins[1] = new Pin(1, SIDE_W, "I2");
	pins[2] = new Pin(0, SIDE_E, "O");
	pins[2].output = true;
    }
    boolean nonLinear() { return true; }
    void stamp() {
	int vn = sim.nodeList.size()+pins[2].voltSource;
	sim.stampNonLinear(vn);
	sim.stampNonLinear(0);
	sim.stampNonLinear(nodes[2]);
    }
    boolean ff1, ff2;
    void doStep() {
	boolean v1 = volts[0] > 2.5;
	boolean v2 = volts[1] > 2.5;
	if (v1 && !pins[0].value)
	    ff1 = true;
	if (v2 && !pins[1].value)
	    ff2 = true;
	if (ff1 && ff2)
	    ff1 = ff2 = false;
	double out = (ff1) ? 5 : (ff2) ? 0 : -1;
	//System.out.println(out + " " + v1 + " " + v2);
	if (out != -1)
	    sim.stampVoltageSource(0, nodes[2], pins[2].voltSource, out);
	else {
	    // tie current through output pin to 0
	    int vn = sim.nodeList.size()+pins[2].voltSource;
	    sim.stampMatrix(vn, vn, 1);
	}
	pins[0].value = v1;
	pins[1].value = v2;
    }
    int getPostCount() { return 3; }
    int getVoltageSourceCount() { return 1; }
    int getDumpType() { return 161; }
}