HOW CAN I STORE SEQUENCE OF BUTTON PRESSES IN ARMSIM ASSEMBL

HOW CAN I STORE SEQUENCE OF BUTTON PRESSES IN ARMSIM ASSEMBLY??

FOR EXAMPLE WE ARE SIMULATING A ELECTRONIC POCKET THAT REQUIRES PASSWORD TO BE UNLOCKED
WHEN THE USER SET THE PASSWORD FOR THAT ELECTRONIC POCKET HE HAVE TO PRESS BUTTONS (SIMULATES PASSCODE)
SO HOW I DO THAT

ASSEMBLY ARMSIM IS REQUIRED (PLEASE PROVIDE A SNIPPET OF CODE SO I CAN UNDERSTAND)

I am trying to have 8 segment display show the correct letters when the user pressed or enters a certain button sequence.
On start up it should display U, then if they press the left black button is should display L, and etc. But nothing is happening on start up! Even when I press any of the other buttons, nothing gets displayed on the 8 seg display. Here is code

.equ SWI_SETSEG8, 0x200 @display on 8 Segment

.equ SWI_SETLED, 0x201 @LEDs on/off

.equ SWI_CheckBlack, 0x202 @check Black button

.equ SWI_CheckBlue, 0x203 @check press Blue button

.equ SWI_EXIT, 0x11 @terminate program

.equ SWI_GetTicks, 0x6d @get current time

.equ SEG_A, 0x80 @patterns for 8 segment display

.equ SEG_B, 0x40 @byte values for each segment

.equ SEG_C, 0x20 @of the 8 segment display

.equ SEG_D, 0x08

.equ SEG_E, 0x04

.equ SEG_F, 0x02

.equ SEG_G, 0x01

.equ ItsUnlocked, SEG_G|SEG_E|SEG_D|SEG_C|SEG_B @ display U

.equ ItsLocked, SEG_G|SEG_E|SEG_D @ display L

.equ Programming, SEG_G|SEG_E|SEG_A|SEG_B|SEG_F @ display P

.equ Confirming, SEG_A|SEG_G|SEG_E|SEG_D @ display C

.equ ForgetIt, SEG_G|SEG_E|SEG_A|SEG_F @ display F

.equ Error, SEG_G|SEG_E|SEG_A|SEG_F|SEG_D @ display E .equ LEFT_LED, 0x02 @bit patterns for LED lights

.equ RIGHT_LED, 0x01

.equ LEFT_BLACK_BUTTON,0x02 @bit patterns for black buttons

.equ RIGHT_BLACK_BUTTON,0x01 @and for blue buttons .text

_start:

@turn on both led

mov r0,#(LEFT_LED|RIGHT_LED)

swi SWI_SETLED

@start up display \'U\' in the 8 seg

StartUp:

MOV R0,

#ItsUnlocked

SWI SWI_SETSEG8

CheckWhatsPressed:

@check if the left button is pressed

SWI SWI_CheckBlack

CMP R0, #LEFT_BLACK_BUTTON

BLEQ LeftButton @go if its pressed

@check if the right button is pressed

SWI SWI_CheckBlack

CMP R0, #RIGHT_BLACK_BUTTON

BLEQ RightButton

LeftButton: @locks the safe

SWI SWI_CheckBlack

CMP R0, #LEFT_BLACK_BUTTON

MOVEQ R0, #ItsLocked @display L

SWI SWI_SETSEG8

B TryUnlocking

BX LR @go back to previous method

TryUnlocking:

@you cant unlock it if nothings been programmed yet, so ignore if no previous code

SWI SWI_CheckBlue

STMFD R6!, {R0} @store the value the user presses

BL NextState

@if the user presses left, then done

SWI SWI_CheckBlack

CMP R1, #LEFT_BLACK_BUTTON

BXEQ LR B TryUnlocking @keep getting values until they are done coding

NextState:@updates the next value the user presses

STMFD SP!, {LR}

LDMFD SP!, {LR}

BX LR

RightButton: @displays either P, C, A, or E

MOV R0, #Programming @display P

SWI SWI_SETSEG8

B LearnNewCode

LearnNewCode:

SWI SWI_CheckBlue

STMFD R7!, {R0}

BL NextState

@if they press right again they are done, else keep repeating SWI SWI_CheckBlack

CMP R1, #RIGHT_BLACK_BUTTON

BEQ RepeatCode

B LearnNewCode

RepeatCode:

MOV R1, #Confirming @display C

SWI SWI_SETSEG8

SWI SWI_CheckBlue

STMFD R8!, {R0}

BL NextState

@if they press right, then they are done --> compare

SWI SWI_CheckBlack

CMP R1, #RIGHT_BLACK_BUTTON

BEQ ConfirmTheCode

B RepeatCode

ConfirmTheCode:

@check to see if the code matches or not

CMP R7, R8

BLEQ TheyMatch

BLNE DontMatch

TheyMatch:

MOV R0, #AwesomePossum @display A

SWI SWI_SETSEG8

BX LR

DontMatch:

MOV R0, #Error @display E

SWI SWI_SETSEG8

BX LR

.data

HOW CAN I STORE SEQUENCE OF BUTTON PRESSES IN ARMSIM ASSEMBL

Solution

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