Please help fix my code (I am using keil with texas instruments tiva launchpad c series tm4c123gxl)

This is the assignment

This is my code

; The programn tests gpio_a for input/output

; Setup

;

;

;

GPIO_PORTA_DATA_R EQU 0x400043FC

GPIO_PORTA_DIR_R EQU 0x40004400

GPIO_PORTA_AFSEL_R EQU 0x40004420

GPIO_PORTA_PUR_R EQU 0x40004510

GPIO_PORTA_DEN_R EQU 0x4000451C

GPIO_PORTA_LOCK_R EQU 0x40004520

GPIO_PORTA_CR_R EQU 0x40004524

GPIO_PORTA_AMSEL_R EQU 0x40004528

GPIO_PORTA_PCTL_R EQU 0x4000452C

GPIO_LOCK_KEY EQU 0x4C4F434B ; Unlocks the GPIO_CR register

....

....

SYSCTL_RCGC2_R EQU 0x400FE108

SYSCTL_RCGC2_GPIOA EQU 0x00000001 ; port A Clock Gating Control

;delay

ONESECOND EQU 5333333

AREA |.text|, CODE, READONLY, ALIGN=2

THUMB

EXPORT Start

Start

BL PortA_Init ; initialize input and output pins of

Port A

loop

LDR R0, =FIFTHSEC ; R0 = FIFTHSEC (delay 0.2 second)

BL delay ; delay at least (3*R0) cycles

BL PortA_Input ; read all of the switches on Port A

CMP R0, #0x01 ; R0 == 0x01?

BEQ sw1pressed

....

....

B loop

;

;

PortA_Init

LDR R1, =SYSCTL_RCGC2_R ; 1) activate clock for Port A

LDR R0, [R1]

ORR R0, R0, #0x01 ; set bit 1 to turn on clock

STR R0, [R1]

NOP

NOP ; allow time for clock to finish

LDR R1, =GPIO_PORTA_LOCK_R ; 2) unlock the lock register

LDR R0, =0x4C4F434B ; unlock GPIO Port A Commit Register

STR R0, [R1]

LDR R1, =GPIO_PORTA_CR_R ; enable commit for Port F

MOV R0, #0xFF ; 1 means allow access

STR R0, [R1]

LDR R1, =GPIO_PORTA_AMSEL_R ; 3) disable analog functionality

MOV R0, #0 ; 0 means analog is off

STR R0, [R1]

LDR R1, =GPIO_PORTA_PCTL_R ; 4) configure as GPIO

MOV R0, #0x00000000 ; 0 means configure Port A as GPIO

STR R0, [R1]

LDR R1, =GPIO_PORTA_DIR_R ; 5) set direction register

MOV R0,#0xE0 ; PA5-PA7 FOR OUTPUT and PA2 FOR input

STR R0, [R1]

LDR R1, =GPIO_PORTA_AFSEL_R ; 6) regular port function

MOV R0, #0 ; 0 means disable alternate function

STR R0, [R1]

LDR R1, =GPIO_PORTA_PUR_R ; pull-up resistors for PF4,PF0

MOV R0, #0x11 ; enable weak pull-up on PF0 and PF4

STR R0, [R1]

LDR R1, =GPIO_PORTA_DEN_R ; 7) enable Port F digital port

MOV R0, #0xFF ; 1 means enable digital I/O

STR R0, [R1]

BX LR

;

;GPIO_PORTE_BASE EQU 0X40024000

;GPIO_PORTF_BASE EQU 0X40025000

;GPIO_DATA_R EQU 0x3FC

;GPIO_DIR_R EQU 0x400

;GPIO_AFSEL_R EQU 0x420

;GPIO_PUR_R EQU 0x510

;GPIO_DEN_R EQU 0x51C

;GPIO_LOCK_R EQU 0x520

;GPIO_CR_R EQU 0x524

;GPIO_AMSEL_R EQU 0x528

;GPIO_PCTL_R EQU 0x52C

;GPIO_LOCK_KEY EQU 0x4C4F434B ; Unlocks the GPIO_CR register

; PA2: input switch

; PA5:LED Green

; PA6: LED Yellow

; PA7: LED Red

RED EQU 0x10

BLUE EQU 0x20

GREEN EQU 0x40

SW1 EQU 0x02 ; on the left side of the Launchpad board

;SW2 EQU 0x01 ; on the right side of the Launchpad board

SYSCTL_RCGC2_R EQU 0x400FE108

SYSCTL_RCGC2_GPIOA EQU 0x00000001 ; port A Clock Gating Control

AREA |.text|, CODE, READONLY, ALIGN=2

THUMB

EXPORT Start

Start

;Set initial value to the counter. Turn on LEDs

;STEP 4 Is the button (PA2) pressed? If not, wait.

;Increment the counter. Turn on LEDs

;Wait (Delay) for 1 second. (Use a function call, BL)

;Branch to Step 4)

bl init_port_a

bl clear

bl button

bl count

bl delay

loop bl led_on

;read the switch

count adds r1, r11

bx lr

delay ldr r0, =ONESECOND

b_delay_loop sub ro, #1

cmp r0, #0

bne b_delay_loop

bx lr

clear ldr r2, [GPIO_PORTA_DATA_R]

ldr r1, #0xe0

mvns r1, [r1]

and r2, r1 ; r2 = new destination register

str GPIO_PORTA_DATA_R, [r2]

ldr r11, #0

bx lr

button ;ldr r3, =GPIO_PORTA_BASE

ldr r0, [GPIO_PORTA_DATA_R]

and r0, r0, #0x04

cmp r0, #0x04

beq loop

; bl led_off

; nop

b button

; b loop

;

led_on ldr r3, =GPIO_PORTE_BASE

mov r0,#0x0ff

str r0, [r3, #GPIO_DATA_R]

bx lr

;

led_off ldr r3, =GPIO_PORTE_BASE

mov r0,#0x000

str r0, [r3, #GPIO_DATA_R]

bx lr

;

;

;init_port_e

; ldr r3, =SYSCTL_RCGC2_R ;turn on clock on port-e

; ldr r0, [r3]

; orr r0, r0, #0x020

; orr r0, r0, #0x010

; str r0, [r3]

; nop

; nop

; ldr r3, =GPIO_PORTE_BASE

; ldr r0, =GPIO_LOCK_KEY ;unlock the lock register

; str r0, [r3, #GPIO_LOCK_R]

; mov r0, #0x00f7 ;set all pins but pin-3 as output

; str r0, [r3, #GPIO_DIR_R]

; mov r0, #0xff ;set up pull-up registers

; str r0, [r3, #GPIO_PUR_R]

; mov r0, #0xff ;set up digital enable

; str r0, [r3, #GPIO_DEN_R]

; mov r0, #0xff ;set control register

; str r0, [r3, #GPIO_CR_R]

; bx lr

;

ALIGN ; make sure the end of this section is aligned

END ; end of file

EECE237 Homework 2: 3-bit Binary Counter . The objective is to build a three bit counter with the Tiva board. The counter increments from zero to 0x07 (1112) and repeats the cycle with 1 second interval as long as the switch is on. For this lab, use a DIP switch (not the push button on Tiva), an LED array (not the ones on Tiva), wires and a breadboard. Use GND and 3.3V from the Tiva board . Refer to TM4C123GH6PM Data Sheet for register information . Use PORT-A (APB) for the input and output connection o PA2: input switch o PA5:LED b0 (LSB bit) o PA6: LED bl PA7: LED b2 (MSB bit) Name your file, firstname-initial-lastname-hw2.s. Submit your file to BBLearm. You have two chances for submission. The submission is due by 10/4 (Wednesday) midnight. Hint: Below is one of the possible algorithms for the assignment. 1) Start. Put comments and directives 2) Configure GPIO_Port A for an input (PA2) and three outputs (PA7, PA6, PA5) a. Configure RCGC GPIOA b. Configure GPIO DIR register c. Configure AFSEL register d. Configure DEN register e. Configure other registers if necessarry 3) Set initial value to the counter. Turn on LEDs 4) Is the button (PA2) pressed? If not, wait. 5) Increment the counter. Turn on LEDs 6) Wait (Delay) for 1 second. (Use a function call, BL) 7) Branch to Step 4) Appendix: How to use a (solderless) Breadboard You build a circuit on a breadboard with components and wires 1. First place components on the breadboard properly. a. b. c The holes in a row are shorted together. You may use any hole in a row The center grove separates the rows above from below (or left from right). The holes next to a blue or red line are all shorted together. You may use the row as a power bus or a ground bus EECE237 Homework 2: 3-bit Binary Counter . The objective is to build a three bit counter with the Tiva board. The counter increments from zero to 0x07 (1112) and repeats the cycle with 1 second interval as long as the switch is on. For this lab, use a DIP switch (not the push button on Tiva), an LED array (not the ones on Tiva), wires and a breadboard. Use GND and 3.3V from the Tiva board . Refer to TM4C123GH6PM Data Sheet for register information . Use PORT-A (APB) for the input and output connection o PA2: input switch o PA5:LED b0 (LSB bit) o PA6: LED bl PA7: LED b2 (MSB bit) Name your file, firstname-initial-lastname-hw2.s. Submit your file to BBLearm. You have two chances for submission. The submission is due by 10/4 (Wednesday) midnight. Hint: Below is one of the possible algorithms for the assignment. 1) Start. Put comments and directives 2) Configure GPIO_Port A for an input (PA2) and three outputs (PA7, PA6, PA5) a. Configure RCGC GPIOA b. Configure GPIO DIR register c. Configure AFSEL register d. Configure DEN register e. Configure other registers if necessarry 3) Set initial value to the counter. Turn on LEDs 4) Is the button (PA2) pressed? If not, wait. 5) Increment the counter. Turn on LEDs 6) Wait (Delay) for 1 second. (Use a function call, BL) 7) Branch to Step 4) Appendix: How to use a (solderless) Breadboard You build a circuit on a breadboard with components and wires 1. First place components on the breadboard properly. a. b. c The holes in a row are shorted together. You may use any hole in a row The center grove separates the rows above from below (or left from right). The holes next to a blue or red line are all shorted together. You may use the row as a power bus or a ground bus