hades.models.pic
Class FastPic16F84

java.lang.Object
  hades.simulator.SimObject
      hades.models.pic.FastPic16F84

All Implemented Interfaces:

java.lang.Cloneable, ContextToolTip, java.io.Serializable, Simulatable, Wakeable

public class FastPic16F84

extends SimObject

implements Simulatable, Wakeable

A HADES simulation model for the Arizona Microchip PIC16x84 microcontroller. We use the hades.models.pic.PicExec with its helper classes for the processor core.

To reduce HADES event count for the PIC x4 input clock, this model uses an internally generated clock signal with regular wakeup events for the synchronisation with the simulation engine. As long as no external I/O activity occurs, this generates one HADES event per processor instruction cycle (which is much more efficient than using an external component like hades.models.io.ClockGen to feed the PIC clock input at 12 HADES events per processor instruction cycle).

However, note that the processor ignores its Clkin pin, and that internal processor cycles may desynchronize up to 1 clk-period with the rest of the external simulation. For example, sampling of the Port A/B inputs may occur 1/4 cycle too early, and also the timing of Port B interrupts detection differs a little from the real device. If exact timing is a requirement for your system, use the hades.models.Pic16C84 instead of the FastPic16C84.

As performance experiments indicated, that up to 70% of total simulation time was spent in the HADES interfacing in older versions of the Pic processor model, the current version uses several data structures to reduce costly and time-consuming interaction with HADES. These consist of four variables that store the last input values to the processor core and the last values written to the port A/B output registers by the processor itself.

These arrays/values are initialized on object construction and again on each elaborate() call. During simulation, the portInputA/B variables are updated on each evaluate() call, and the portOutputA/B variables are updated once the processor writes to its PORTA/B registers or the corresponding TRISA/B registers.

See Also:

Serialized Form

Field Summary

(package private) static boolean[]	_StdLogic1164ToBooleanTable
int[]	currentPortInputsA
int[]	currentPortInputsB
int[]	currentPortOutputsA
int[]	currentPortOutputsB
int	lastClk
int	lastOsc2
int[]	lastPortInputsB
int	lastT0cki
int	n_cycles
int	n_dirty_pa
int	n_dirty_pb
int	n_dirty_ta
int	n_dirty_tb
int	n_handledPortChanges
int	n_inputPortChanges
PicExec	pic
PortStdLogic1164[]	portA
PortStdLogic1164[]	portB
PortStdLogic1164	portClkin
PortStdLogic1164	portClkout
PortStdLogic1164	portMclr
PicPortReg	regPortA
PicPortReg	regPortB
PicWordReg	regTrisA
PicWordReg	regTrisB
boolean	resetActive
StringDialog	sd
ShowPic2	show
Signal[]	signalA
Signal[]	signalB
Signal	signalClkin
Signal	signalClkout
Signal	signalMclr
double	t_delay
StdLogic1164	value_0
StdLogic1164	value_1
StdLogic1164	value_Z

Fields inherited from class hades.simulator.SimObject

classloader, console, debug, editor, name, parent, ports, propertySheet, simulator, symbol, versionId, visible

Constructor Summary

FastPic16F84()

Method Summary

void	configure() create and display a 'ConfigDialog' to set the parameters for a SimObject.
boolean	convertToBoolean(int value)
boolean	convertToBoolean(StdLogic1164 value)
void	createClockPeriodGUI()
void	createPicExec()
void	createPorts()
void	doCheckBreakpoint()
void	doCheckIncrementTMR0()
void	doCheckPortsForInterrupt()
void	doPrintPortRegDirtyStatistics()
void	doReadPortsRaw()
void	doReset()
void	doSamplePorts()
void	doSetClkout(StdLogic1164 value, double t)
void	doSetPorts()
void	doUpdateShowPic()
void	elaborate(java.lang.Object arg) elaborate: initialize the FastPic16C84 model.
void	evaluate(java.lang.Object arg) evaluate(): called by the simulation engine on all events that concern this object.
void	finalize()
java.lang.String[]	getExternalResources() return a String[] array of length 1 with the program ROM init file.
java.awt.Component	getPropertySheet() return a reference to the 'property sheet' or configuration window for this SimObject.
java.lang.String	getToolTip(java.awt.Point position, long millis) construct a tool tip message (with the timing parameters)
boolean	initialize(java.lang.String s) initialize PicEprom from a String.
void	instructionCycle()
boolean	needsExternalResources() we use one external resource: the program ROM initialization file.
void	printPortBackupArrays()
void	readInputPorts() read the values of all StdLogic1164 signals connected to ports A/B and initialize the currentPortInputsA/B arrays.
java.lang.String	toString() toString: generate a text description for this SimObject.
void	wakeup(java.lang.Object event) wakeup: either the main clock-period or the watchdog-timer period has elapsed.
void	write(java.io.PrintWriter ps) write FastPIC configuration data to a HADES design file: versionID, clk4Period (instruction cycle time), program EPROM resource name

Methods inherited from class hades.simulator.SimObject

constructDynamicSymbol, copy, getBindkey, getClassLoader, getDebug, getEditor, getFullName, getName, getParent, getPort, getPorts, getResourceAsStream, getSimulator, getSymbol, getSymbolResourceName, getVersionId, isVisible, keyPressed, message, mousePressed, needsDynamicSymbol, setClassLoader, setConsole, setDebug, setEditor, setName, setParent, setPorts, setSimulator, setSymbol, setVersionId, setVisible, tearDown

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface hades.simulator.Simulatable

message

Field Detail

show

public ShowPic2 show

sd

public StringDialog sd

pic

public PicExec pic

regPortA

public PicPortReg regPortA

regPortB

public PicPortReg regPortB

regTrisA

public PicWordReg regTrisA

regTrisB

public PicWordReg regTrisB

portClkin

public PortStdLogic1164 portClkin

portClkout

public PortStdLogic1164 portClkout

portMclr

public PortStdLogic1164 portMclr

portA

public PortStdLogic1164[] portA

portB

public PortStdLogic1164[] portB

value_Z

public StdLogic1164 value_Z

value_0

public StdLogic1164 value_0

value_1

public StdLogic1164 value_1

signalClkin

public Signal signalClkin

signalClkout

public Signal signalClkout

signalMclr

public Signal signalMclr

signalA

public Signal[] signalA

signalB

public Signal[] signalB

currentPortInputsA

public int[] currentPortInputsA

currentPortInputsB

public int[] currentPortInputsB

lastPortInputsB

public int[] lastPortInputsB

currentPortOutputsA

public int[] currentPortOutputsA

currentPortOutputsB

public int[] currentPortOutputsB

n_inputPortChanges

public int n_inputPortChanges

n_handledPortChanges

public int n_handledPortChanges

n_cycles

public int n_cycles

n_dirty_pa

public int n_dirty_pa

n_dirty_ta

public int n_dirty_ta

n_dirty_pb

public int n_dirty_pb

n_dirty_tb

public int n_dirty_tb

lastClk

public int lastClk

lastOsc2

public int lastOsc2

lastT0cki

public int lastT0cki

resetActive

public boolean resetActive

t_delay

public double t_delay

_StdLogic1164ToBooleanTable

static boolean[] _StdLogic1164ToBooleanTable

Constructor Detail

FastPic16F84

public FastPic16F84()

Method Detail

createPicExec

public void createPicExec()

needsExternalResources

public boolean needsExternalResources()

we use one external resource: the program ROM initialization file.

Overrides:

needsExternalResources in class SimObject

getExternalResources

public java.lang.String[] getExternalResources()

return a String[] array of length 1 with the program ROM init file.

Overrides:

getExternalResources in class SimObject

toString

public java.lang.String toString()

Description copied from class: SimObject

toString: generate a text description for this SimObject. This method currently combines the class name for the SimObject (or subclass) and its full name in the current Hades Design, e.g. "hades.models.gates.And2: /uut/adder16/adder1/i3".

Overrides:

toString in class SimObject

getToolTip

public java.lang.String getToolTip(java.awt.Point position,
                                   long millis)

construct a tool tip message (with the timing parameters)

Specified by:

getToolTip in interface ContextToolTip

Overrides:

getToolTip in class SimObject

createPorts

public void createPorts()

initialize

public boolean initialize(java.lang.String s)

initialize PicEprom from a String. Currently, the String should contain the following things: the Pic16C84-versionId, and the filename of the RAM datafile to parse, e.g.

       1001 /home/rink/hades/models/pic/echo232.rom
    

Overrides:

initialize in class SimObject

write

public void write(java.io.PrintWriter ps)

write FastPIC configuration data to a HADES design file: versionID, clk4Period (instruction cycle time), program EPROM resource name

Overrides:

write in class SimObject

elaborate

public void elaborate(java.lang.Object arg)

elaborate: initialize the FastPic16C84 model. We schedule the initial wakeup-events of both the main processor clock and the watchdog timer.

Specified by:

elaborate in interface Simulatable

Overrides:

elaborate in class SimObject

wakeup

public void wakeup(java.lang.Object event)

wakeup: either the main clock-period or the watchdog-timer period has elapsed.

Specified by:

wakeup in interface Wakeable

printPortBackupArrays

public void printPortBackupArrays()

evaluate

public void evaluate(java.lang.Object arg)

Description copied from interface: Simulatable

evaluate(): called by the simulation engine on all events that concern this object. The object is responsible for updating its internal state and for scheduling all pending output events.

Specified by:

evaluate in interface Simulatable

Overrides:

evaluate in class SimObject

Parameters:

arg - an arbitrary object argument

doReset

public void doReset()

readInputPorts

public void readInputPorts()

read the values of all StdLogic1164 signals connected to ports A/B and initialize the currentPortInputsA/B arrays.

doCheckPortsForInterrupt

public void doCheckPortsForInterrupt()

doCheckIncrementTMR0

public void doCheckIncrementTMR0()

doReadPortsRaw

public void doReadPortsRaw()

doSamplePorts

public void doSamplePorts()

doSetPorts

public void doSetPorts()

doPrintPortRegDirtyStatistics

public void doPrintPortRegDirtyStatistics()

finalize

public void finalize()
              throws java.lang.Throwable

Throws:

java.lang.Throwable

doCheckBreakpoint

public void doCheckBreakpoint()

doUpdateShowPic

public void doUpdateShowPic()

doSetClkout

public void doSetClkout(StdLogic1164 value,
                        double t)

instructionCycle

public void instructionCycle()

getPropertySheet

public java.awt.Component getPropertySheet()

Description copied from class: SimObject

return a reference to the 'property sheet' or configuration window for this SimObject. We cast the return value to an AWT Component, but typically you can expect either a hades.gui.PropertySheet or an java.awt.Window (Dialog or Frame).

Overrides:

getPropertySheet in class SimObject

configure

public void configure()

Description copied from class: SimObject

create and display a 'ConfigDialog' to set the parameters for a SimObject. The default ConfigDialog for the base class (SimObject) itself is empty except for the 'instance name' of the SimObject.

Overrides:

configure in class SimObject

convertToBoolean

public final boolean convertToBoolean(int value)

convertToBoolean

public boolean convertToBoolean(StdLogic1164 value)

createClockPeriodGUI

public void createClockPeriodGUI()