Step 1: Create a new ASSEMBLY project using Keil Software

(1)Make sure you use the M3 option

(2)Make sure you name the folder COSC2440_Lab08_YourFirstName_YourLastName

Step 2:

Write an ARM assembly language program that counts the number of 1s for any value in R0. The program must assemble/compile in KEIL and must be able to run in the KEIL simulator. Generally, R0 may contain any value, but for purpose of this exercise, you may move 0x2345ABCD into R0. The number in R0 does not need be preserved. You may use any other registers as you need. The result, total count of 1s in R0, should be in R1 when the program ends.

Step 3: Copy the template below to your assembly file

AREA Lab_08_YourFirstName_YourLastName, CODE, READONLY

EXPORT __main

__main

LDR R0, =0x2345ABCD; This is how you assign large value to R0. MOV will NOT work!

stop B stop

END

Step 4:

Change YourFirstName to your first name. Change YourLastName to your last name.

Step 5: You are allowed to use ONLY the instructions below:

1. LDR

2. MOV

3. CMP

4. BEQ

5. CLZ

6. ADD

7. LSL

8. BNE

You may use Keil ARM documentation to learn about any of the instructions listed above. http://www.keil.com/support/man/docs/armasm/armasm_dom1361289850039.htm

Step 6:

Results:

Hexadecimal: 0x2345ABCD

Decimal: 591,768,525

Binary: 10 0011 0100 0101 1010 1011 1100 1101

The expected result will be 16 [Count # of 1 in the Binary Value above]

R1 should be 0x00000010

Step 7:

Hints.

1. You will need to use one loop

2. Use Windows Calculator to convert between hexadecimal to binary to save yourself time as shown in previous labs.