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Home Page: https://csdiy.wiki/en/%E4%BD%93%E7%B3%BB%E7%BB%93%E6%9E%84/N2T/

Scilab 8.45% Assembly 24.31% Hack 59.37% HTML 3.55% Batchfile 0.34% Shell 0.46% Python 3.51%
computer-system bulid-a-computer

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nand2tetris's Issues

[solved] Error occurred when I run `bash CPUEmulator.sh` to test `nand2tetris/projects/8/FunctionCalls/FibonacciElement/FibonacciElement.asm`

commit: dd9ce20

occupymars2025@occupymars2025:~/Downloads/Nand2Tetris/nand2tetris/tools$ Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at java.desktop/javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:245)
	at java.desktop/javax.swing.RepaintManager.paint(RepaintManager.java:1323)
	at java.desktop/javax.swing.JComponent._paintImmediately(JComponent.java:5203)
	at java.desktop/javax.swing.JComponent.paintImmediately(JComponent.java:5013)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:865)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:848)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:848)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:823)
	at java.desktop/javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:772)
	at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1890)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at java.desktop/javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:245)
	at java.desktop/javax.swing.RepaintManager.paint(RepaintManager.java:1323)
	at java.desktop/javax.swing.JComponent._paintImmediately(JComponent.java:5203)
	at java.desktop/javax.swing.JComponent.paintImmediately(JComponent.java:5013)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:865)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:848)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:848)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:823)
	at java.desktop/javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:772)
	at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1890)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Exception in thread "Thread-1389" java.lang.NullPointerException
	at java.desktop/javax.swing.BufferStrategyPaintManager.copyArea(BufferStrategyPaintManager.java:286)
	at java.desktop/javax.swing.RepaintManager.copyArea(RepaintManager.java:1338)
	at java.desktop/javax.swing.JViewport.blitDoubleBuffered(JViewport.java:1717)
	at java.desktop/javax.swing.JViewport.windowBlitPaint(JViewport.java:1680)
	at java.desktop/javax.swing.JViewport.setViewPosition(JViewport.java:1220)
	at java.desktop/javax.swing.JViewport.scrollRectToVisible(JViewport.java:446)
	at java.desktop/javax.swing.JComponent.scrollRectToVisible(JComponent.java:3133)
	at HackGUI.Utilities.tableCenterScroll(Unknown Source)
	at HackGUI.PointedMemoryComponent.setPointer(Unknown Source)
	at Hack.ComputerParts.PointedMemory.setPointerAddress(Unknown Source)
	at Hack.CPUEmulator.PointerAddressRegisterAdapter.setValueAt(Unknown Source)
	at Hack.CPUEmulator.CPU.executeInstruction(Unknown Source)
	at Hack.CPUEmulator.CPUEmulator.doCommand(Unknown Source)
	at Hack.Controller.HackController.miniStep(Unknown Source)
	at Hack.Controller.HackController.singleStep(Unknown Source)
	at Hack.Controller.HackController.access$000(Unknown Source)
	at Hack.Controller.HackController$SingleStepTask.run(Unknown Source)
	at java.base/java.lang.Thread.run(Thread.java:829)

[FYI] how the 16 bits of one instruction relate to the interface of the ALU ?

In Figure 4.5 (Hack instruction set), if you examine it carefully, you can find that the "cccccc" corresponds to the 6 input ports "zx nx zy ny f no" of the ALU exactly, that is, instruction[11] is connected to "zx" ..., this observation should greatly simplify your implementation of nand2tetris/projects/5/CPU.hdl

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