First, start Keil uVision$5$ and open the project CS$238.$uvprojx $.$ This project has two source files:

$1.$ init.s $-$ This file contains some initialization code and some utility functions to make I$/$O easy, which otherwise is extremely arduous in

assembly. It is recommended that you never modify this file, but trying to understand some or all of its code will be very instructive.

However, that's optional and, at this point you'll probably not understand much of it$,$ but by the end of the semester, it'll all be a piece of

cake!

$2.$ LMF$120$H$5$QR$.$inc $-$ This file is included from within the init.s file. It contains code specific to a particular Texas Instrument

microcontroller that's based upon an ARM CPU. All our programs will be executed in an environment that simulates this microcontroller. You

should definitely never modify this file or something will very likely go wrong!!

Follow the steps$-$

$1.$ Now, download the file HA$4-$main.s from the blackboard $($Home Assignment Folder$),$ and place it in the same CS$238$ folder that contains the

project.

$2.$ Right$-$click on Source Code in the left$-$pane of Keil uVision$5$ and choose the option Add Existing Files to Group 'Source Code'....

$3.$ In the pop$-$up window, set Files of type: to All Files $(*.*),$ click on HA$4-$main.s$,$ then the Add button, and finally the Close button.

$4.$ Build the resulting project, and make sure you get $0$ Error$($s$)$ and $0$ Warning$($s$)$ in the Build Output window below.

$5.$ Start execution of this project in the debugger, and select toolbar menu option View $/$ Serial Windows $/$ UART #$1.$ This will bring up the

UART #$1$ console window for I$/$O$.$

$6.$ Now click the Run button on uVision$5($or the F$5$ function key$)$ to run the program unobstructed. The UART #$1$ window will show prompts to ask

for your name and an integer value.

$7.$ It will then display double of your integer value and stop. It will be useful if you try to understand all the existing code in HA$4-$main.s$.$

$8.$ Terminate program execution by exiting the debugger.

Main Assignment:

Your assignment is to replace the portion in HA$4-$main.s that is within hyphened comments $($i$.$e$.$ everything between lines $40$ and $64)$ by a

mainline program.

Your program will compute: $1+2+3+4+5+......................................................................................+$n$.$

You could prompt the user for n and display the sum. You might want to use Gauss formula: n $($n$+1)/2.$

Create your own sensible prompts and output messages.

An example execution of your program could be:

Please enter the number of terms in your series: $20$

The sum of your series is $210.$

Submit the code file in blackboard.