Convert Miles to Kilometres In ARM Assembly Language Assignment Solution

Instructions

Objective

Write an ARM program Convert miles to kilometres in ARM assembly language.

Requirements and Specifications

In the file libConversions.s you will implement two functions. Note the function signatures (order of arguments) must be maintained. Hours must be the first argument to kph!

1. The first function is miles2kilometer(int miles), which will convert kilometers to miles by multiplying by 100 and dividing by 166. (Put in a comment why we multiply by 100, then divide by 166. Suggest how even greater precision could be achieved using this method for integer numbers).
2. The second function is kph(int hours, int miles), and must be calculated by calling function miles2kilometers to convert the miles to kilometers, and then dividing by hours.
3. Write an assembly language assignment program to prompt for and read the values of miles and hours, and print out the mph.

Write the functions CToF and InchesToFt and add it to the conversions.s file. Write a main program to call it and test it.

Screenshots of output

Source Code

mainkph.s

# FileName: mainKph.s # Author: ????? # Date: 10/17/2022 # Purpose: Test the kph function in the libConversions library .text .global main main: # save return address in stack SUB sp, sp, #4 STR lr, [sp, #0] # prompt to enter hours LDR r0, =prompth BL printf # read hours in stack LDR r0, =format SUB sp, sp, #4 MOV r1, sp BL scanf # load read number in r4 LDR r4, [sp, #0] ADD sp, sp, #4 # prompt to enter miles LDR r0, =promptm BL printf # read miles in stack LDR r0, =format SUB sp, sp, #4 MOV r1, sp BL scanf # load read number in r5 LDR r5, [sp, #0] ADD sp, sp, #4 # make calculation MOV r0, r4 MOV r1, r5 BL kph # print result MOV r1, r0 LDR r0, =result BL printf # load return address from stack LDR lr, [sp, #0] ADD sp, sp, #4 # return to os MOV pc, lr .data prompth: .asciz "Enter the number of hours: " promptm: .asciz "Enter the number of miles: " format: .asciz "%d" result: .asciz "The value of kph is: %d\n"

mainInchesToFt.s

# FileName: mainInchesToFt.s # Author: ????? # Date: 10/17/2022 # Purpose: Test the CtoF and InchesToFt functions in the libConversions library .text .global main main: # save return address in stack SUB sp, sp, #4 STR lr, [sp, #0] # prompt to enter celsius LDR r0, =promptC BL printf # read celsius in stack LDR r0, =format SUB sp, sp, #4 MOV r1, sp BL scanf # load read number in r0 LDR r0, [sp, #0] ADD sp, sp, #4 # make calculation BL CtoF # print result MOV r1, r0 LDR r0, =resultF BL printf # prompt to enter inches LDR r0, =promptI BL printf # read inches in stack LDR r0, =format SUB sp, sp, #4 MOV r1, sp BL scanf # load read number in r0 LDR r0, [sp, #0] ADD sp, sp, #4 # make calculation BL InchesToFt # print result MOV r1, r0 LDR r0, =resultFt BL printf # load return address from stack LDR lr, [sp, #0] ADD sp, sp, #4 # return to os MOV pc, lr .data promptC: .asciz "Enter the number of celsius: " promptI: .asciz "\nEnter the number of inches: " format: .asciz "%d" resultF: .asciz "The value of fahrenheit is: %d\n" resultFt: .asciz "The value of feet is: %d\n"

libConversion.s

# FileName: libConversions.s # Author: ????? # Date: 10/17/2022 # Purpose: Conversion functions .text .global miles2kilometers # Function: miles2kilometers # Purpose: convert miles to kilometers # # Input: r0 - value in miles to convert # # Output: r0 - value converted to kilometers miles2kilometers: # save return address in stack SUB sp, sp, #4 STR lr, [sp, #0] # load value of 161 for multiplication MOV r2, #161 # multiply miles * 161 MUL r0, r0, r2 # load value of 100 to make division MOV r1, #100 # divide (miles * 161) / 100 BL __aeabi_idiv # answer is in r0 so we can return it to caller # We multiply times 100 in order to move the decimal point two positions # to the left, the value of 161 is thus 1.61 * 100, 1.61 is the # conversion of 1 mile to kilometers. # The division by 100 is used to get the correct decimal point position: # km = x mile * (161 km/mile) / 100 = x * 1.61 km # If we need more precision we can multiply by a larger power of 10, for # example 10000, thus the decimal point will be moved 4 positions to the left # load return address from stack LDR lr, [sp, #0] ADD sp, sp, #4 # return to caller MOV pc, lr .global kph # Function: kph # Purpose: calculate kph from hours and miles # # Input: r0 - value of hours # r1 - value of miles # # Output: r0 - result of calculation of kilometers per hour kph: # save return address and r4 in stack SUB sp, sp, #8 STR lr, [sp, #0] STR r4, [sp, #4] # save hours argument in r4 MOV r4, r0 # convert miles to kilometers MOV r0, r1 BL miles2kilometers # km is in r0 # copy value of hours MOV r1, r4 # divide km / hours BL __aeabi_idiv # answer is in r0 so we can return it to caller # load return address and r4 from stack LDR lr, [sp, #0] LDR r4, [sp, #4] ADD sp, sp, #8 # return to caller MOV pc, lr .global CtoF # Function: CToF # Purpose: convert celsius to fahrenheit # # Input: r0 - value of celsius # # Output: r0 - conversion to fahrenheit CtoF: # save return address in stack SUB sp, sp, #4 STR lr, [sp, #0] # load value of 900 for multiplication MOV r2, #900 # multiply celsius * 900 MUL r0, r0, r2 # load value of 500 to make division MOV r1, #500 # divide (celsius * 900) / 500 BL __aeabi_idiv # answer is in r0 # add 32 to get answer ADD r0, r0, #32 # load return address from stack LDR lr, [sp, #0] ADD sp, sp, #4 # return to caller MOV pc, lr .global InchesToFt # Function: InchesToFt # Purpose: convert inches to feet # # Input: r0 - value of inches # # Output: r0 - conversion to feet InchesToFt: # save return address in stack SUB sp, sp, #4 STR lr, [sp, #0] # load value of 12 to make division MOV r1, #12 # divide inches / 12 BL __aeabi_idiv # answer is in r0 # load return address from stack LDR lr, [sp, #0] ADD sp, sp, #4 # return to caller MOV pc, lr