HW4 Finished

29 files changed, 607 insertions, 95 deletions

diff --git a/ExamPrepTwo/ASM_layout.hwl b/ExamPrepTwo/ASM_layout.hwl
new file mode 100644
index 0000000..af05bda
--- /dev/null
+++ b/ExamPrepTwo/ASM_layout.hwl
@@ -0,0 +1,18 @@
+OPEN source 0 0 60 42
+Source < attributes MARKS off
+OPEN assembly 60 0 40 30
+Assembly < attributes ADR on,CODE off,ABSADR on,SYMB off,TOPPC 0xF800
+OPEN procedure 60 60 40 17
+Procedure < attributes VALUES on,TYPES off
+OPEN register 60 30 40 30
+Register < attributes FORMAT AUTO,COMPLEMENT None
+OPEN memory 60 77 40 23
+Memory < attributes FORMAT hex,COMPLEMENT None,WORD 1,ASC on,ADR on,ADDRESS 0x80
+OPEN data 0 42 60 28
+Data < attributes SCOPE global,COMPLEMENT None,FORMAT Symb,MODE automatic,UPDATERATE 10,NAMEWIDTH 16
+OPEN command 0 70 60 30
+Command < attributes CACHESIZE 1000
+bckcolor 50331647
+font 'Courier New' 9 BLACK
+AUTOSIZE on
+ACTIVATE Assembly Memory Register Command Data Source Procedure
diff --git a/ExamPrepTwo/Default.mem b/ExamPrepTwo/Default.mem
new file mode 100644
index 0000000..bf49148
--- /dev/null
+++ b/ExamPrepTwo/Default.mem
diff --git a/ExamPrepTwo/ExamPrepTwo.mcp b/ExamPrepTwo/ExamPrepTwo.mcp
new file mode 100644
index 0000000..69554d2
--- /dev/null
+++ b/ExamPrepTwo/ExamPrepTwo.mcp
diff --git a/ExamPrepTwo/ExamPrepTwo_Data/CWSettingsWindows.stg b/ExamPrepTwo/ExamPrepTwo_Data/CWSettingsWindows.stg
new file mode 100644
index 0000000..db4777a
--- /dev/null
+++ b/ExamPrepTwo/ExamPrepTwo_Data/CWSettingsWindows.stg
diff --git a/ExamPrepTwo/ExamPrepTwo_Data/Standard/ObjectCode/main.asm.o b/ExamPrepTwo/ExamPrepTwo_Data/Standard/ObjectCode/main.asm.o
new file mode 100644
index 0000000..f0db289
--- /dev/null
+++ b/ExamPrepTwo/ExamPrepTwo_Data/Standard/ObjectCode/main.asm.o
diff --git a/ExamPrepTwo/ExamPrepTwo_Data/Standard/ObjectCode/main.asm.sx b/ExamPrepTwo/ExamPrepTwo_Data/Standard/ObjectCode/main.asm.sx
new file mode 100644
index 0000000..cccac41
--- /dev/null
+++ b/ExamPrepTwo/ExamPrepTwo_Data/Standard/ObjectCode/main.asm.sx
@@ -0,0 +1,5 @@
+S0700000433A5C55736572735C4A61636F62204D63446F6E6E656C6C5C446F63756D656E74735C434D50454E2D3437322D48575C4578616D5072657054776F5C4578616D5072657054776F5F446174615C5374616E646172645C4F626A656374436F64655C6D61696E2E61736D2E70726D69
+S104300000CB
+S12331008646C63C1806A7863CC6BA1806A786C4C6BA1816A78646C6C41816A7F63000B66B
+S108312030004326FD10
+S9033100CB
diff --git a/ExamPrepTwo/ExamPrepTwo_Data/Standard/TargetDataWindows.tdt b/ExamPrepTwo/ExamPrepTwo_Data/Standard/TargetDataWindows.tdt
new file mode 100644
index 0000000..f8b9e74
--- /dev/null
+++ b/ExamPrepTwo/ExamPrepTwo_Data/Standard/TargetDataWindows.tdt
diff --git a/ExamPrepTwo/Full_Chip_Simulation.ini b/ExamPrepTwo/Full_Chip_Simulation.ini
new file mode 100644
index 0000000..6a37f67
--- /dev/null
+++ b/ExamPrepTwo/Full_Chip_Simulation.ini
@@ -0,0 +1,27 @@
+[Environment Variables]
+GENPATH={Project}Sources;{Compiler}lib\hc12c\src;{Compiler}lib\hc12c\include;{Compiler}lib\hc12c\lib;{Compiler}lib\xgatec\src;{Compiler}lib\xgatec\include;{Compiler}lib\xgatec\lib
+LIBPATH={Compiler}lib\hc12c\include;{Compiler}lib\xgatec\include
+OBJPATH={Project}bin
+TEXTPATH={Project}bin
+ABSPATH={Project}bin
+
+[HI-WAVE]
+Target=sim
+Layout=ASM_layout.hwl
+LoadDialogOptions=AUTOERASEANDFLASH NORUNAFTERLOAD
+CPU=HC12
+MainFrame=2,3,-1,-1,-1,-1,130,130,2050,1153
+TOOLBAR=57600 57601 32795 0 57635 57634 57637 0 57671 57669 0 32777 32776 32782 32780 32781 32778 0 32806
+
+
+
+[Simulator]
+CMDFILE0=CMDFILE STARTUP ON ".\cmd\Full_Chip_Simulation_startup.cmd"
+
+[Simulator HC12]
+CMDFILE0=CMDFILE RESET ON ".\cmd\Full_Chip_Simulation_reset.cmd"
+CMDFILE1=CMDFILE PRELOAD ON ".\cmd\Full_Chip_Simulation_preload.cmd"
+CMDFILE2=CMDFILE POSTLOAD ON ".\cmd\Full_Chip_Simulation_postload.cmd"
+CMDFILE3=CMDFILE SETCPU ON ".\cmd\Full_Chip_Simulation_setcpu.cmd"
+HCS12_SUPPORT=1
+FCS=MC9S12C32
diff --git a/ExamPrepTwo/Sources/derivative.inc b/ExamPrepTwo/Sources/derivative.inc
new file mode 100644
index 0000000..988343b
--- /dev/null
+++ b/ExamPrepTwo/Sources/derivative.inc
@@ -0,0 +1,10 @@
+
+ ; Note: This file is recreated by the project wizard whenever the MCU is
+ ;       changed and should not be edited by hand
+ ;
+
+			; include derivative specific macros
+            INCLUDE 'mc9s12c32.inc'
+
+		
+
diff --git a/ExamPrepTwo/Sources/main.asm b/ExamPrepTwo/Sources/main.asm
new file mode 100644
index 0000000..fc86659
--- /dev/null
+++ b/ExamPrepTwo/Sources/main.asm
@@ -0,0 +1,56 @@
+**************************************************************************
+* Parameter Declearation Section
+*
+* Export Symbols
+            xdef        pgstart         ; export 'pgstart' symbol
+            absentry    pgstart         ; for assembly entry point
+
+* Symbols and Macros
+PORTA       equ         $0000           ; i/o port A addresses
+DDRA        equ         $0002           ; data direction register for PORTA
+PORTB       equ         $0001           ; i/o port B addresses
+DDRB        equ         $0003           ; data direction register for PORTB
+
+**************************************************************************
+* Data Section: address used [ $3000 to $30FF ] RAM Memory
+*
+            org         $3000           ; Reserved RAM memory starting address
+                                        ;   for Data for CMPEN 472 class
+num         dc.b        0
+
+*
+**************************************************************************
+* Program Section: address used [ $3100 to $3FFF ] RAM Memory
+*
+            org         $3100           ; Program start address, in RAM
+pgstart     ldaa        #70
+            ldab        #60
+            aba
+            nop
+            
+            ldaa        #60
+            ldab        #-70
+            aba
+            nop
+            
+            ldaa        #-60
+            ldab        #-70
+            sba
+            nop
+            
+            ldaa        #70
+            ldab        #-60
+            sba
+            nop
+            
+            ldab        num
+            
+dly         ldaa        num
+loop        deca
+            bne         loop
+            
+*
+**************************************************************************
+
+done        
+            end                         ; Last line of the file
\ No newline at end of file
diff --git a/ExamPrepTwo/bin/Project.abs b/ExamPrepTwo/bin/Project.abs
new file mode 100644
index 0000000..f0db289
--- /dev/null
+++ b/ExamPrepTwo/bin/Project.abs
diff --git a/ExamPrepTwo/bin/Project.abs.phy b/ExamPrepTwo/bin/Project.abs.phy
new file mode 100644
index 0000000..c781cf8
--- /dev/null
+++ b/ExamPrepTwo/bin/Project.abs.phy
@@ -0,0 +1,2 @@
+S04E0000433A5C55736572735C4A61636F62204D63446F6E6E656C6C5C446F63756D656E74735C434D50454E2D3437322D48575C4578616D5072657054776F5C62696E5C50726F6A6563742E61627398
+S9030000FC
diff --git a/ExamPrepTwo/bin/Project.abs.s19 b/ExamPrepTwo/bin/Project.abs.s19
new file mode 100644
index 0000000..287233e
--- /dev/null
+++ b/ExamPrepTwo/bin/Project.abs.s19
@@ -0,0 +1,5 @@
+S04E0000433A5C55736572735C4A61636F62204D63446F6E6E656C6C5C446F63756D656E74735C434D50454E2D3437322D48575C4578616D5072657054776F5C62696E5C50726F6A6563742E61627398
+S104300000CB
+S12331008646C63C1806A7863CC6BA1806A786C4C6BA1816A78646C6C41816A7F63000B66B
+S108312030004326FD10
+S9030000FC
diff --git a/ExamPrepTwo/bin/main.dbg b/ExamPrepTwo/bin/main.dbg
new file mode 100644
index 0000000..f284c7d
--- /dev/null
+++ b/ExamPrepTwo/bin/main.dbg
@@ -0,0 +1,55 @@
+**************************************************************************
+* Parameter Declearation Section
+*
+* Export Symbols
+            xdef        pgstart         ; export 'pgstart' symbol
+            absentry    pgstart         ; for assembly entry point
+
+* Symbols and Macros
+PORTA       equ         $0000           ; i/o port A addresses
+DDRA        equ         $0002           ; data direction register for PORTA
+PORTB       equ         $0001           ; i/o port B addresses
+DDRB        equ         $0003           ; data direction register for PORTB
+
+**************************************************************************
+* Data Section: address used [ $3000 to $30FF ] RAM Memory
+*
+            org         $3000           ; Reserved RAM memory starting address
+                                        ;   for Data for CMPEN 472 class
+num         dc.b        0
+
+*
+**************************************************************************
+* Program Section: address used [ $3100 to $3FFF ] RAM Memory
+*
+            org         $3100           ; Program start address, in RAM
+pgstart     ldaa        #70
+            ldab        #60
+            aba
+            nop
+            
+            ldaa        #60
+            ldab        #-70
+            aba
+            nop
+            
+            ldaa        #-60
+            ldab        #-70
+            sba
+            nop
+            
+            ldaa        #70
+            ldab        #-60
+            sba
+            nop
+            
+            ldab        num
+            
+dly         ldaa        num
+loop        deca
+            bne         loop
+            
+*
+**************************************************************************
+
+done        
diff --git a/ExamPrepTwo/cmd/Full_Chip_Simulation_Postload.cmd b/ExamPrepTwo/cmd/Full_Chip_Simulation_Postload.cmd
new file mode 100644
index 0000000..ac4d359
--- /dev/null
+++ b/ExamPrepTwo/cmd/Full_Chip_Simulation_Postload.cmd
@@ -0,0 +1 @@
+// After load the commands written below will be executed
diff --git a/ExamPrepTwo/cmd/Full_Chip_Simulation_Preload.cmd b/ExamPrepTwo/cmd/Full_Chip_Simulation_Preload.cmd
new file mode 100644
index 0000000..0bed464
--- /dev/null
+++ b/ExamPrepTwo/cmd/Full_Chip_Simulation_Preload.cmd
@@ -0,0 +1 @@
+// Before load the commands written below will be executed
diff --git a/ExamPrepTwo/cmd/Full_Chip_Simulation_Reset.cmd b/ExamPrepTwo/cmd/Full_Chip_Simulation_Reset.cmd
new file mode 100644
index 0000000..bf55944
--- /dev/null
+++ b/ExamPrepTwo/cmd/Full_Chip_Simulation_Reset.cmd
@@ -0,0 +1 @@
+// After reset the commands written below will be executed
diff --git a/ExamPrepTwo/cmd/Full_Chip_Simulation_SetCPU.cmd b/ExamPrepTwo/cmd/Full_Chip_Simulation_SetCPU.cmd
new file mode 100644
index 0000000..6a1549a
--- /dev/null
+++ b/ExamPrepTwo/cmd/Full_Chip_Simulation_SetCPU.cmd
@@ -0,0 +1 @@
+// At startup the commands written below will be executed
diff --git a/ExamPrepTwo/cmd/Full_Chip_Simulation_Startup.cmd b/ExamPrepTwo/cmd/Full_Chip_Simulation_Startup.cmd
new file mode 100644
index 0000000..6a1549a
--- /dev/null
+++ b/ExamPrepTwo/cmd/Full_Chip_Simulation_Startup.cmd
@@ -0,0 +1 @@
+// At startup the commands written below will be executed
diff --git a/ExamPrepTwo/prm/burner.bbl b/ExamPrepTwo/prm/burner.bbl
new file mode 100644
index 0000000..0c57619
--- /dev/null
+++ b/ExamPrepTwo/prm/burner.bbl
@@ -0,0 +1,157 @@
+/* logical s-record file */
+OPENFILE "%ABS_FILE%.s19"
+format=motorola
+busWidth=1
+origin=0
+len=0x1000000
+destination=0
+SRECORD=Sx
+SENDBYTE 1 "%ABS_FILE%"
+CLOSE
+
+
+/* physical s-record file */
+OPENFILE "%ABS_FILE%.phy"
+format = motorola
+busWidth = 1
+len = 0x4000
+
+/* logical non banked flash at $4000 and $C000 to physical */
+origin = 0x004000
+destination = 0x0F8000
+SENDBYTE 1 "%ABS_FILE%"
+
+origin = 0x00C000
+destination = 0x0FC000
+SENDBYTE 1 "%ABS_FILE%"
+
+/* physical FTS512K flash window to physical 
+origin = 0x008000
+destination = 0x080000 
+SENDBYTE 1 "%ABS_FILE%"
+*/
+
+/* physical FTS256K parts flash window to physical 
+origin = 0x008000
+destination = 0x0C0000 
+SENDBYTE 1 "%ABS_FILE%"
+*/
+
+/* physical FTS128K parts flash window to physical 
+origin = 0x008000
+destination = 0x0E0000 
+SENDBYTE 1 "%ABS_FILE%"
+*/
+
+/* physical FTS64K parts flash window to physical 
+origin = 0x008000
+destination = 0x0F0000 
+SENDBYTE 1 "%ABS_FILE%"
+*/
+
+/* physical FTS32K parts flash window to physical 
+origin = 0x008000
+destination = 0x0F8000 
+SENDBYTE 1 "%ABS_FILE%"
+*/
+
+/* logical 512 kB banked flash to physical */
+origin = 0x208000
+destination = 0x080000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x218000
+destination = 0x084000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x228000
+destination = 0x088000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x238000
+destination = 0x08C000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x248000
+destination = 0x090000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x258000
+destination = 0x094000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x268000
+destination = 0x098000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x278000
+destination = 0x09C000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x288000
+destination = 0x0A0000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x298000
+destination = 0x0A4000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x2A8000
+destination = 0x0A8000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x2B8000
+destination = 0x0AC000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x2C8000
+destination = 0x0B0000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x2D8000
+destination = 0x0B4000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x2E8000
+destination = 0x0B8000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x2F8000
+destination = 0x0BC000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x308000
+destination = 0x0C0000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x318000
+destination = 0x0C4000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x328000
+destination = 0x0C8000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x338000
+destination = 0x0CC000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x348000
+destination = 0x0D0000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x358000
+destination = 0x0D4000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x368000
+destination = 0x0D8000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x378000
+destination = 0x0DC000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x388000
+destination = 0x0E0000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x398000
+destination = 0x0E4000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x3A8000
+destination = 0x0E8000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x3B8000
+destination = 0x0EC000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x3C8000
+destination = 0x0F0000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x3D8000
+destination = 0x0F4000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x3E8000
+destination = 0x0F8000
+SENDBYTE 1 "%ABS_FILE%"
+origin = 0x3F8000
+destination = 0x0FC000
+SENDBYTE 1 "%ABS_FILE%"
+
+CLOSE
+
diff --git a/cmpen472hw4_McDonnell/Full_Chip_Simulation.ini b/cmpen472hw4_McDonnell/Full_Chip_Simulation.ini
index 0ea39fd..e7c287d 100644
--- a/cmpen472hw4_McDonnell/Full_Chip_Simulation.ini
+++ b/cmpen472hw4_McDonnell/Full_Chip_Simulation.ini
@@ -10,7 +10,7 @@ Target=sim
 Layout=Full_Chip_Simulation.hwl
 LoadDialogOptions=AUTOERASEANDFLASH NORUNAFTERLOAD
 CPU=HC12
-MainFrame=2,3,-32000,-32000,-1,-1,985,223,2200,1246
+MainFrame=2,3,-1,-1,-1,-1,985,223,2200,1246
 Configuration=Full_Chip_Simulation.hwc
 Statusbar=1
 ShowToolbar=1
diff --git a/cmpen472hw4_McDonnell/Sources/cmpen472hw4_McDonnell.asm b/cmpen472hw4_McDonnell/Sources/cmpen472hw4_McDonnell.asm
new file mode 100644
index 0000000..87a8a3c
--- /dev/null
+++ b/cmpen472hw4_McDonnell/Sources/cmpen472hw4_McDonnell.asm
@@ -0,0 +1,172 @@
+**************************************************************************
+*
+* Title:        LED Light Dimmer Loop
+*
+* Objective:    CMPEN 472 Homework 4
+*
+* Revision:     V1.0
+*
+* Date:         Feb. 14, 2025
+*
+* Programmer:   Jacob McDonnell
+*
+* Company:      The Pennsylvania State University
+*               Department of Computer Science and Engineering
+*
+* Algorithm:    Simple Parallel I/O use, time delay-loop, and PWM control
+*
+* Register Use: A to control LEDS initially and for Light Level
+*               X to hold the counter in the loop.
+*
+* Memory Use:   RAM Locations from $3000 for data,
+*               RAM Locations from $3100 for program
+*
+* Input:        Parameters hard-coded in the program - PORTB
+*               Switch 1 at PORTB bit 0
+*               Switch 2 at PORTB bit 1
+*               Switch 3 at PORTB bit 2
+*               Switch 4 at PORTB bit 3
+*
+* Output:       LED 1 at PORTB bit 4
+*               LED 2 at PORTB bit 5
+*               LED 3 at PORTB bit 6
+*               LED 4 at PORTB bit 7
+*
+* Observation:  This program will decrease LED 4 from 100% to 0% in 400ms
+*               and then increase LED 4 from 0% to 100% in 400ms. The program
+*               will loop forever.
+*
+* Note:         ON CSM-12C128 board,
+*               Switch 1 is at PORTB bit 0, and
+*               LED 4 is at PORTB bit 7.
+*
+* Comments:     This program is developed and simulated using CodeWarrior
+*               development software and targeted for Axion
+*               Manufacturing's CSM-12C128 board running at 24MHz.
+*
+**************************************************************************
+* Parameter Declearation Section
+*
+* Export Symbols
+            xdef        pgstart         ; export 'pgstart' symbol
+            absentry    pgstart         ; for assembly entry point
+
+* Symbols and Macros
+PORTA       equ         $0000           ; i/o port A addresses
+DDRA        equ         $0002           ; data direction register for PORTA
+PORTB       equ         $0001           ; i/o port B addresses
+DDRB        equ         $0003           ; data direction register for PORTB
+
+**************************************************************************
+* Data Section: address used [ $3000 to $30FF ] RAM Memory
+*
+            org         $3000           ; Reserved RAM memory starting address
+                                        ;   for Data for CMPEN 472 class
+Counter     dc.w        $0036           ; X register count number for time Delay
+                                        ;   loop for 10 useconds
+                                        ; The work to calculate this number is in
+                                        ; the comments for the delay10usec subroutine.
+                                        
+LEVEL       dc.b        $0005           ; Light Level that the LED should be
+
+*
+**************************************************************************
+* Program Section: address used [ $3100 to $3FFF ] RAM Memory
+*
+            org         $3100           ; Program start address, in RAM
+pgstart     lds         #$3100          ; initialize the stack pointer
+
+            ldaa        #%11110001      ; LED 1,2,3,4 at PORTB bit 4,5,6,7
+            staa        DDRB            ; set PORTB bit 4,5,6,7 as output
+
+
+            ldaa        #%01010000
+            staa        PORTB           ; Turn on only LEDs 1 & 3 on PORTB
+
+mainLoop
+            ldaa        #100            ; load 100 into accumulator A
+decrease    tbeq        A,increase      ; Test if A == 0, skip loop if so
+            staa        LEVEL           ; store A in counter LEVEL
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            deca                        ; decrement accumulator A by 1
+            bra         decrease        ; loop to decrease always
+increase    cmpa        #100            ; Compare A to 100
+            beq         mainLoop        ; Test if A == 100, jump to mainLoop
+            staa        LEVEL           ; store A in counter LEVEL
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            inca                        ; increment accumulator A by 1
+            bra         increase        ; loop to increase always
+
+**************************************************************************
+* Subroutine Section: address used [ $3100 to $3FFF ] RAM Memory
+*
+
+;*************************************************************************
+; dimmer subroutine
+;
+; This subroutine will dim LED4 to a given level
+;
+; Input:                   Two 1 byte counters, ONN and OFF, for how many times
+;                          LED4 should be on and off for.
+; Output:                  LED4 dimmed to a given level, wasted cycles
+; Registers in use:        A accumulator to counter number of times looped
+; Memory locations in use: Two bytes ONN and OFF used to dim the LED4 to a given level
+;
+; Comments: This subroutine requires delay10usec subroutine
+;
+
+dimmer
+            bset        PORTB,%10000000 ; Turn LED4 on
+            psha                        ; Save A to the stack
+            ldaa        LEVEL           ; Load the light level into accumulator A
+onDelay     tbeq        A, skipToOff    ; Test if A == 0, skip loop if so
+            jsr         delay10usec     ; delay for 10 microseconds
+            deca                        ; decrement accumulator A by 1
+            bra         onDelay         ; jump back to onDelay always
+skipToOff   bclr        PORTB,%10000000 ; Turn off LED4
+            ldaa        #100            ; load 100 into accumulator A
+            suba        LEVEL           ; Subtract LEVEL to get off count
+offDelay    tbeq        A,doneLoop      ; Test if A == 0, skip loop if so
+            jsr         delay10usec     ; delay 10 microseconds
+            deca                        ; decrement accumulator A by 1
+            bra         offDelay        ; jump back to offDelay always
+doneLoop    pula                        ; restore A from the stack
+            rts                         ; return to caller
+
+;*************************************************************************
+; delay10usec subroutine
+;
+; This subroutine causes a 10 usec. delay
+;
+; Input:                   a 16bit count number in 'Counter'
+; Output:                  time delay, cpu cycle wasted
+; Registers in use:        X register, as counter
+; Memory locations in use: a 16bit input number at 'Counter'
+;
+; Comments: Code relies on counter being $39 to be exactly 10 usec work is below
+; Given: freq = 24MHz = 24000000     sec = 10 usec = 0.00001
+; freq = cycles / seconds
+; 
+; cycles = freq * seconds = 24000000Hz * 0.00001 = 240
+; 
+; This sub routine is 12 + 4 * 'Counter' cycles long, solving for 'Counter'
+; the result is found to be 57.
+;
+
+delay10usec
+            pshx                        ; Save register x to the stack
+            ldx         Counter         ; load counter into register x
+innerLoop   dex                         ; decrement register x by 1
+            bne         innerLoop       ; loop while register x is not 0
+            pulx                        ; restore register x from the stack
+            nop                         ; extra nop to make exactly 10 usec
+            rts                         ; return to caller
+
+            end                         ; last line of the file
+
diff --git a/cmpen472hw4_McDonnell/Sources/main.asm b/cmpen472hw4_McDonnell/Sources/main.asm
index bbf1a9a..87a8a3c 100644
--- a/cmpen472hw4_McDonnell/Sources/main.asm
+++ b/cmpen472hw4_McDonnell/Sources/main.asm
@@ -1,22 +1,22 @@
 **************************************************************************
 *
-* Title:        LED Light Dimmer
+* Title:        LED Light Dimmer Loop
 *
-* Objective:    CMPEN 472 Homework 3
+* Objective:    CMPEN 472 Homework 4
 *
 * Revision:     V1.0
 *
-* Date:         Feb. 5, 2025
+* Date:         Feb. 14, 2025
 *
 * Programmer:   Jacob McDonnell
 *
 * Company:      The Pennsylvania State University
 *               Department of Computer Science and Engineering
 *
-* Algorithm:    Simple Parallel I/O use and time delay-loop demo
+* Algorithm:    Simple Parallel I/O use, time delay-loop, and PWM control
 *
-* Register Use: A: LED Light on/off state and Switch 1 on/off state
-*               X: Delay loop counter
+* Register Use: A to control LEDS initially and for Light Level
+*               X to hold the counter in the loop.
 *
 * Memory Use:   RAM Locations from $3000 for data,
 *               RAM Locations from $3100 for program
@@ -32,8 +32,9 @@
 *               LED 3 at PORTB bit 6
 *               LED 4 at PORTB bit 7
 *
-* Observation:  This program will dim the LED4 to either 5% when the 
-*               switch is not pressed and 15% when the switch is pressed.
+* Observation:  This program will decrease LED 4 from 100% to 0% in 400ms
+*               and then increase LED 4 from 0% to 100% in 400ms. The program
+*               will loop forever.
 *
 * Note:         ON CSM-12C128 board,
 *               Switch 1 is at PORTB bit 0, and
@@ -83,25 +84,24 @@ pgstart     lds         #$3100          ; initialize the stack pointer
             staa        PORTB           ; Turn on only LEDs 1 & 3 on PORTB
 
 mainLoop
-            ldaa        #100            ; 1 ; load 100 into accumulator A
-            ldab        #100            ; 1 ; load 100 into accumulator B
-decrease    tbeq        A,increase      ; 3 ; Test if A == 0, skip loop if so
-            staa        LEVEL           ; 3 ; store A in counter LEVEL
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            deca                        ; 1 ; decrement accumulator A by 1
-            bra         decrease        ; 3 ; loop to decrease always
-increase    tbeq        B,mainLoop      ; 3 ; Test if B == 0, go back to mainLoop if so
-            staa        LEVEL           ; 3 ; store A in counter LEVEL
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            inca                        ; 1 ; increment accumulator A by 1
-            decb                        ; 1 ; decrement accumulator B by 1
-            bra         increase        ; 3 ; loop to increase always
+            ldaa        #100            ; load 100 into accumulator A
+decrease    tbeq        A,increase      ; Test if A == 0, skip loop if so
+            staa        LEVEL           ; store A in counter LEVEL
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            deca                        ; decrement accumulator A by 1
+            bra         decrease        ; loop to decrease always
+increase    cmpa        #100            ; Compare A to 100
+            beq         mainLoop        ; Test if A == 100, jump to mainLoop
+            staa        LEVEL           ; store A in counter LEVEL
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            inca                        ; increment accumulator A by 1
+            bra         increase        ; loop to increase always
 
 **************************************************************************
 * Subroutine Section: address used [ $3100 to $3FFF ] RAM Memory
@@ -122,22 +122,22 @@ increase    tbeq        B,mainLoop      ; 3 ; Test if B == 0, go back to mainLoo
 ;
 
 dimmer
-            bset        PORTB,%10000000 ; 6 ; Turn LED4 on
-            psha                        ; 2 ; Save A to the stack
-            ldaa        LEVEL           ; 3 ; Load the light level into accumulator A
-onDelay     tbeq        A, skipToOff    ; 3 ; Test if A == 0, skip loop if so
-            jsr         delay10usec     ; 244 ; delay for 10 microseconds
-            deca                        ; 1 ; decrement accumulator A by 1
-            bra         onDelay         ; 3, 1; jump back to onDelay always
-skipToOff   bclr        PORTB,%10000000 ; 6 ; Turn off LED4
-            ldaa        #100            ; 1 ; load 100 into accumulator A
-            suba        LEVEL           ; 3 ; Subtract LEVEL to get off count
-offDelay    tbeq        A,doneLoop      ; 3 ; Test if A == 0, skip loop if so
-            jsr         delay10usec     ; 244 ; delay 10 microseconds
-            deca                        ; 1 ; decrement accumulator A by 1
-            bra         offDelay        ; 3, 1; jump back to offDelay always
-doneLoop    pula                        ; 3 ; restore A from the stack
-            rts                         ; 5 ; return to caller
+            bset        PORTB,%10000000 ; Turn LED4 on
+            psha                        ; Save A to the stack
+            ldaa        LEVEL           ; Load the light level into accumulator A
+onDelay     tbeq        A, skipToOff    ; Test if A == 0, skip loop if so
+            jsr         delay10usec     ; delay for 10 microseconds
+            deca                        ; decrement accumulator A by 1
+            bra         onDelay         ; jump back to onDelay always
+skipToOff   bclr        PORTB,%10000000 ; Turn off LED4
+            ldaa        #100            ; load 100 into accumulator A
+            suba        LEVEL           ; Subtract LEVEL to get off count
+offDelay    tbeq        A,doneLoop      ; Test if A == 0, skip loop if so
+            jsr         delay10usec     ; delay 10 microseconds
+            deca                        ; decrement accumulator A by 1
+            bra         offDelay        ; jump back to offDelay always
+doneLoop    pula                        ; restore A from the stack
+            rts                         ; return to caller
 
 ;*************************************************************************
 ; delay10usec subroutine
diff --git a/cmpen472hw4_McDonnell/bin/Project.abs b/cmpen472hw4_McDonnell/bin/Project.abs
index 2810115..c7cfa1a 100644
--- a/cmpen472hw4_McDonnell/bin/Project.abs
+++ b/cmpen472hw4_McDonnell/bin/Project.abs
diff --git a/cmpen472hw4_McDonnell/bin/Project.abs.s19 b/cmpen472hw4_McDonnell/bin/Project.abs.s19
index 82aa46b..44b157e 100644
--- a/cmpen472hw4_McDonnell/bin/Project.abs.s19
+++ b/cmpen472hw4_McDonnell/bin/Project.abs.s19
@@ -1,7 +1,7 @@
 S0580000433A5C55736572735C4A61636F62204D63446F6E6E656C6C5C446F63756D656E74735C434D50454E2D3437322D48575C636D70656E3437326877345F4D63446F6E6E656C6C5C62696E5C50726F6A6563742E6162734C
 S10630000036058E
-S1233100CF310086F15A0386505A018664C6640440127A300216313A16313A16313A1631C6
-S12331203A4320EB0451E47A300216313A16313A16313A16313A425320EA4C018036B63092
-S12331400204400616315D4320F74D01808664B0300204400616315D4320F7323D34FE306E
-S10A3160000926FD30A73D24
+S1233100CF310086F15A0386505A0186640440127A3002163138163138163138163138437B
+S123312020EB816427E57A30021631381631381631381631384220EA4C018036B6300204AC
+S1233140400616315B4320F74D01808664B0300204400616315B4320F7323D34FE3000096F
+S108316026FD30A73D2F
 S9030000FC
diff --git a/cmpen472hw4_McDonnell/bin/main.dbg b/cmpen472hw4_McDonnell/bin/main.dbg
index 4154ae3..853722f 100644
--- a/cmpen472hw4_McDonnell/bin/main.dbg
+++ b/cmpen472hw4_McDonnell/bin/main.dbg
@@ -1,22 +1,22 @@
 **************************************************************************
 *
-* Title:        LED Light Dimmer
+* Title:        LED Light Dimmer Loop
 *
-* Objective:    CMPEN 472 Homework 3
+* Objective:    CMPEN 472 Homework 4
 *
 * Revision:     V1.0
 *
-* Date:         Feb. 5, 2025
+* Date:         Feb. 14, 2025
 *
 * Programmer:   Jacob McDonnell
 *
 * Company:      The Pennsylvania State University
 *               Department of Computer Science and Engineering
 *
-* Algorithm:    Simple Parallel I/O use and time delay-loop demo
+* Algorithm:    Simple Parallel I/O use, time delay-loop, and PWM control
 *
-* Register Use: A: LED Light on/off state and Switch 1 on/off state
-*               X: Delay loop counter
+* Register Use: A to control LEDS initially and for Light Level
+*               X to hold the counter in the loop.
 *
 * Memory Use:   RAM Locations from $3000 for data,
 *               RAM Locations from $3100 for program
@@ -32,8 +32,9 @@
 *               LED 3 at PORTB bit 6
 *               LED 4 at PORTB bit 7
 *
-* Observation:  This program will dim the LED4 to either 5% when the 
-*               switch is not pressed and 15% when the switch is pressed.
+* Observation:  This program will decrease LED 4 from 100% to 0% in 400ms
+*               and then increase LED 4 from 0% to 100% in 400ms. The program
+*               will loop forever.
 *
 * Note:         ON CSM-12C128 board,
 *               Switch 1 is at PORTB bit 0, and
@@ -83,25 +84,24 @@ pgstart     lds         #$3100          ; initialize the stack pointer
             staa        PORTB           ; Turn on only LEDs 1 & 3 on PORTB
 
 mainLoop
-            ldaa        #100            ; 1 ; load 100 into accumulator A
-            ldab        #100            ; 1 ; load 100 into accumulator B
-decrease    tbeq        A,increase      ; 3 ; Test if A == 0, skip loop if so
-            staa        LEVEL           ; 3 ; store A in counter LEVEL
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            deca                        ; 1 ; decrement accumulator A by 1
-            bra         decrease        ; 3 ; loop to decrease always
-increase    tbeq        B,mainLoop      ; 3 ; Test if B == 0, go back to mainLoop if so
-            staa        LEVEL           ; 3 ; store A in counter LEVEL
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            jsr         dimmer          ; 4 + 25,135 ; jump to dimmer subroutine
-            inca                        ; 1 ; increment accumulator A by 1
-            decb                        ; 1 ; decrement accumulator B by 1
-            bra         increase        ; 3 ; loop to increase always
+            ldaa        #100            ; load 100 into accumulator A
+decrease    tbeq        A,increase      ; Test if A == 0, skip loop if so
+            staa        LEVEL           ; store A in counter LEVEL
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            deca                        ; decrement accumulator A by 1
+            bra         decrease        ; loop to decrease always
+increase    cmpa        #100            ; Compare A to 100
+            beq         mainLoop        ; Test if A == 100, jump to mainLoop
+            staa        LEVEL           ; store A in counter LEVEL
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            jsr         dimmer          ; jump to dimmer subroutine
+            inca                        ; increment accumulator A by 1
+            bra         increase        ; loop to increase always
 
 **************************************************************************
 * Subroutine Section: address used [ $3100 to $3FFF ] RAM Memory
@@ -122,22 +122,22 @@ increase    tbeq        B,mainLoop      ; 3 ; Test if B == 0, go back to mainLoo
 ;
 
 dimmer
-            bset        PORTB,%10000000 ; 6 ; Turn LED4 on
-            psha                        ; 2 ; Save A to the stack
-            ldaa        LEVEL           ; 3 ; Load the light level into accumulator A
-onDelay     tbeq        A, skipToOff    ; 3 ; Test if A == 0, skip loop if so
-            jsr         delay10usec     ; 244 ; delay for 10 microseconds
-            deca                        ; 1 ; decrement accumulator A by 1
-            bra         onDelay         ; 3, 1; jump back to onDelay always
-skipToOff   bclr        PORTB,%10000000 ; 6 ; Turn off LED4
-            ldaa        #100            ; 1 ; load 100 into accumulator A
-            suba        LEVEL           ; 3 ; Subtract LEVEL to get off count
-offDelay    tbeq        A,doneLoop      ; 3 ; Test if A == 0, skip loop if so
-            jsr         delay10usec     ; 244 ; delay 10 microseconds
-            deca                        ; 1 ; decrement accumulator A by 1
-            bra         offDelay        ; 3, 1; jump back to offDelay always
-doneLoop    pula                        ; 3 ; restore A from the stack
-            rts                         ; 5 ; return to caller
+            bset        PORTB,%10000000 ; Turn LED4 on
+            psha                        ; Save A to the stack
+            ldaa        LEVEL           ; Load the light level into accumulator A
+onDelay     tbeq        A, skipToOff    ; Test if A == 0, skip loop if so
+            jsr         delay10usec     ; delay for 10 microseconds
+            deca                        ; decrement accumulator A by 1
+            bra         onDelay         ; jump back to onDelay always
+skipToOff   bclr        PORTB,%10000000 ; Turn off LED4
+            ldaa        #100            ; load 100 into accumulator A
+            suba        LEVEL           ; Subtract LEVEL to get off count
+offDelay    tbeq        A,doneLoop      ; Test if A == 0, skip loop if so
+            jsr         delay10usec     ; delay 10 microseconds
+            deca                        ; decrement accumulator A by 1
+            bra         offDelay        ; jump back to offDelay always
+doneLoop    pula                        ; restore A from the stack
+            rts                         ; return to caller
 
 ;*************************************************************************
 ; delay10usec subroutine
diff --git a/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/ObjectCode/main.asm.o b/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/ObjectCode/main.asm.o
index 2810115..c7cfa1a 100644
--- a/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/ObjectCode/main.asm.o
+++ b/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/ObjectCode/main.asm.o
diff --git a/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/ObjectCode/main.asm.sx b/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/ObjectCode/main.asm.sx
index fbb3fb6..581ede7 100644
--- a/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/ObjectCode/main.asm.sx
+++ b/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/ObjectCode/main.asm.sx
@@ -1,7 +1,7 @@
 S0840000433A5C55736572735C4A61636F62204D63446F6E6E656C6C5C446F63756D656E74735C434D50454E2D3437322D48575C636D70656E3437326877345F4D63446F6E6E656C6C5C636D70656E3437326877345F4D63446F6E6E656C6C5F446174615C5374616E646172645C4F626A656374436F64655C6D61696E2E61736D2E70726DD1
 S10630000036058E
-S1233100CF310086F15A0386505A018664C6640440127A300216313A16313A16313A1631C6
-S12331203A4320EB0451E47A300216313A16313A16313A16313A425320EA4C018036B63092
-S12331400204400616315D4320F74D01808664B0300204400616315D4320F7323D34FE306E
-S10A3160000926FD30A73D24
+S1233100CF310086F15A0386505A0186640440127A3002163138163138163138163138437B
+S123312020EB816427E57A30021631381631381631381631384220EA4C018036B6300204AC
+S1233140400616315B4320F74D01808664B0300204400616315B4320F7323D34FE3000096F
+S108316026FD30A73D2F
 S9033100CB
diff --git a/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/TargetDataWindows.tdt b/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/TargetDataWindows.tdt
index ecf32b1..e7c73d0 100644
--- a/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/TargetDataWindows.tdt
+++ b/cmpen472hw4_McDonnell/cmpen472hw4_McDonnell_Data/Standard/TargetDataWindows.tdt