fertige Lösung zur Analyse

2023-03-30 20:26:18 +02:00
parent 45480d6712
commit 87fc2ea2d7
3 changed files with 85 additions and 0 deletions
--- a/projects/04/tests/hackviaki2.asm
+++ b/projects/04/tests/hackviaki2.asm
@@ -0,0 +1,47 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/04/Fill.asm
+
+// Runs an infinite loop that listens to the keyboard input. 
+// When a key is pressed (any key), the program blackens the screen,
+// i.e. writes "black" in every pixel. When no key is pressed, the
+// program clears the screen, i.e. writes "white" in every pixel.
+
+
+(INIT)  	//initializes i - index that runs on the screen's pixels
+	@8192	 // 32 * 256 number of 16 bit pixel lines to cover the entire screen
+	D=A
+	@i                   //initializes the index variable to 8192, this is the remaining address left to color onscreen
+	M=D
+
+(LOOP)	           //progresses the index backwards. 
+	@i
+	M=M-1
+	D=M
+	@INIT
+	D;JLT               //if index<0 - go to INDEX INITIALIZER to reset it
+	@KBD	            //loads the keyboard's address
+	D=M
+	@WHITE		        //if (Memory at keyboard address == 0) - meaning no key is pressed - go to WHITE, else go to BLACK
+	D;JEQ
+	@BLACK
+	0;JMP
+
+(BLACK)             
+	@SCREEN            //loads the screen's first address - 16384 (0x4000)
+	D=A
+	@i
+	A=D+M              //adds the current index to the screen's first address in order to color the current set of 16 pixels
+	M=-1               //sets value in current address to -1, so that the whole word 1...1 (16bits long),  meaning - all 16 pixels will be "painted" black.
+	@LOOP              //jumps back to indexer in order to progress the index backwards.
+	0;JMP
+
+(WHITE)
+	@SCREEN            //loads the screen's first address - 16384 (0x4000)
+	D=A                
+	@i        
+	A=D+M              //adds the current index to the screen's first address in order to color the current set of 16 pixels
+	M=0                //sets value in current address to 0, so that the whole word will be 0....0 (16bits long), meaning - all 16 pixels will be "painted" white.
+	@LOOP           //jumps back to indexer in order to progress the index backwards.
+	0;JMP