diff options
Diffstat (limited to 'cmpen472hw4_McDonnell/bin/main.dbg')
| -rw-r--r-- | cmpen472hw4_McDonnell/bin/main.dbg | 86 |
1 files changed, 43 insertions, 43 deletions
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 |