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Allow runtime selection of CPU speed

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This commit is contained in:
Seth Morabito 2015-12-30 10:56:03 -08:00
parent 84e5c5ad56
commit 6267d1d777
2 changed files with 77 additions and 9 deletions
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23
src/main/java/com/loomcom/symon/Cpu.java
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@ -58,8 +58,10 @@ public class Cpu implements InstructionTable {
public static final int IRQ_VECTOR_L = 0xfffe;
public static final int IRQ_VECTOR_H = 0xffff;
// Simulated speed is 1 MHz
private static final long CLOCK_IN_NS = 1000;
public static final long DEFAULT_CLOCK_PERIOD_IN_NS = 1000;
/* Simulated clock speed (default is 1MHz) */
private long clockPeriodInNs = DEFAULT_CLOCK_PERIOD_IN_NS;
/* Simulated behavior */
private CpuBehavior behavior;
@ -901,6 +903,21 @@ public class Cpu implements InstructionTable {
return result;
}
/**
* @param clockPeriodInNs The simulated clock period, in nanoseconds
*/
public void setClockPeriodInNs(long clockPeriodInNs) {
logger.debug("Setting simulated clock period to {} ns.", clockPeriodInNs);
this.clockPeriodInNs = clockPeriodInNs;
}
/**
* @return The simulated clock period, in nanoseconds
*/
public long getClockPeriodInNs() {
return clockPeriodInNs;
}
/**
* Return the current Cpu State.
*
@ -1344,7 +1361,7 @@ public class Cpu implements InstructionTable {
return;
}
long interval = clockSteps * CLOCK_IN_NS;
long interval = clockSteps * clockPeriodInNs;
long end;
do {

63
src/main/java/com/loomcom/symon/Simulator.java
View File

@ -57,6 +57,9 @@ public class Simulator {
private static final Font DEFAULT_FONT = new Font(Font.MONOSPACED, Font.PLAIN, DEFAULT_FONT_SIZE);
private static final int CONSOLE_BORDER_WIDTH = 10;
// Clock periods, in NS, for each speed. 0MHz, 1MHz, 2MHz, 3MHz, 4MHz, 5MHz, 6MHz, 7MHz, 8MHz.
private static final long[] CLOCK_PERIODS = {0, 1000, 500, 333, 250, 200, 167, 143, 125};
// Since it is very expensive to update the UI with Swing's Event Dispatch Thread, we can't afford
// to refresh the status view on every simulated clock cycle. Instead, we will only refresh the status view
// after this number of steps when running normally.
@ -597,7 +600,7 @@ public class Simulator {
public SetFontAction(int size) {
super(Integer.toString(size) + " pt", null);
this.size = size;
putValue(SHORT_DESCRIPTION, "Set font to " + Integer.toString(size) + "pt.");
putValue(SHORT_DESCRIPTION, "Set font to " + size + "pt.");
}
public void actionPerformed(ActionEvent actionEvent) {
@ -608,6 +611,25 @@ public class Simulator {
}
}
class SetSpeedAction extends AbstractAction {
private int speed;
public SetSpeedAction(int speed) {
super(Integer.toString(speed) + " MHz", null);
this.speed = speed;
putValue(SHORT_DESCRIPTION, "Set simulated speed to " + speed + " MHz.");
}
@Override
public void actionPerformed(ActionEvent actionEvent) {
if (speed < 1 || speed > CLOCK_PERIODS.length - 1) {
return;
}
machine.getCpu().setClockPeriodInNs(CLOCK_PERIODS[speed]);
}
}
class ToggleTraceWindowAction extends AbstractAction {
public ToggleTraceWindowAction() {
super("Trace Log", null);
@ -712,9 +734,6 @@ public class Simulator {
JMenuItem prefsItem = new JMenuItem(new ShowPrefsAction());
fileMenu.add(prefsItem);
JMenuItem selectMachineItem = new JMenuItem(new SelectMachineAction());
fileMenu.add(selectMachineItem);
JMenuItem quitItem = new JMenuItem(new QuitAction());
fileMenu.add(quitItem);
@ -772,14 +791,46 @@ public class Simulator {
}
add(viewMenu);
/*
* Simulator Menu
*/
JMenu simulatorMenu = new JMenu("Simulator");
JMenu speedSubMenu = new JMenu("Clock Speed");
ButtonGroup speedGroup = new ButtonGroup();
makeSpeedMenuItem(1, speedSubMenu, speedGroup);
makeSpeedMenuItem(2, speedSubMenu, speedGroup);
makeSpeedMenuItem(4, speedSubMenu, speedGroup);
makeSpeedMenuItem(8, speedSubMenu, speedGroup);
simulatorMenu.add(speedSubMenu);
JMenuItem selectMachineItem = new JMenuItem(new SelectMachineAction());
simulatorMenu.add(selectMachineItem);
add(simulatorMenu);
}
private void makeFontSizeMenuItem(int size, JMenu fontSubMenu, ButtonGroup group) {
private void makeFontSizeMenuItem(int size, JMenu subMenu, ButtonGroup group) {
Action action = new SetFontAction(size);
JCheckBoxMenuItem item = new JCheckBoxMenuItem(action);
item.setSelected(size == DEFAULT_FONT_SIZE);
fontSubMenu.add(item);
subMenu.add(item);
group.add(item);
}
private void makeSpeedMenuItem(int speed, JMenu subMenu, ButtonGroup group) {
if (speed < 1 || speed > CLOCK_PERIODS.length - 1) {
return;
}
Action action = new SetSpeedAction(speed);
JCheckBoxMenuItem item = new JCheckBoxMenuItem(action);
item.setSelected(CLOCK_PERIODS[speed] == Cpu.DEFAULT_CLOCK_PERIOD_IN_NS);
subMenu.add(item);
group.add(item);
}
}