Objective of this lab:

	In this lab assignment, you are going to practice 
	implementing procedure calls in SPIM. 

Preparation

	Read lab lecture notes.

Lab Assignment

1. Practice by running the SUM program:

• Download the SUM package: ~ftp/pub/class/201/ftp/sum.zip
• Unzip it and save the files in a folder, say sum.
  Here are the name of files:
  • db_utils.a
  • db_utils.h
  • sum.S
  • syscall.c
  • syscall.h
• Click on the MPLAB IDE v8.76 icon on the desktop.
• Click on the Project menu and then select Project Wizard.
• Select a Device - PIC32MX360F512L, then click on Next.
• From Active Toolsuite, select MicrochipPIC32 C-Compiler Toolsuite, then click on Next.
• Create a New Project File, you have to specify a project filename.
  Select a directory first, e.g. your sum folder, then type a filename. Then click on Next.
• Add the five existing files to your project. Click on Next.
• You will see the Summary window, click on Finish.
  Your project is now successully created.

• Double click on sum.S, you will see it in an editor window.
  It is the source code and it is a working program.
• From the Debugger menu, choose Select Tool, and select PIC32 Starter Kit.
• Click on Build All button or select Build All from the Project menu.
  You will be able to see "BUILD SUCCEEDED".
• Click on the run button or select run from the Debugger menu.
  If you see "Do you want to erase and re-program the memories before proceeding?" click on Yes.
• Click on Halt from the Debugger menu.
• Click on Reset from the Debugger menu.
• You can run your project again.

2. Programming:

1. Prompt the user to enter a string.
2. The program will call the procedure vowelp to check if a character entered in the string is a vowel or not.
3. Count how many vowels and how many non-vowels are in the string.
4. Print out the calculated results with appropriate message.
5. Hint: A loop is needed.

You will run this program in the hardware and
show your testing result with input "Hello There!"

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