Step 1: Create a new ASSEMBLY project using Keil Software (1) Make sure you use the M3 option St...
Step 1: Create a new ASSEMBLY project using Keil Software (1)
Make sure you use the M3 option
Step 2: “Write an ARM assembly language program that counts the
number of 1’s 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 1’s in R0, should be in R1 when
the program ends. “ UHCL: Unwala CENG 3371Microcontroller
Programming Spring 2017
Step 3: Copy the template below to your assembly file AREA
Lab_10_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 3: Change YourFirstName to your first name. Change
YourLastName to your last name.
Step 4: You are allowed to use ONLY the instructions below:
Pay attention: This is different than Lab 08!
1. LDR[*]
2. MOV[*]
3. B[*]
4. ADC[*]
5. LSR[*]
What does [*] means? This means that you may use any combination of
the given instruction. Example: LDR[*] means that you may use LDR
or LDRLE or LDREQ or LDRS or any other combinations.
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 5: 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 6: Hints. 1. The tricks in solving this lab are dealing with
flags and carry! 2. You will need to use one loop 3. Use Windows
Calculator to convert between hexadecimal to binary to save
yourself time as shown in previous labs.
Homework Answers
IF YOU HAVE ANY DOUBTS COMMENT BELOW I WILL BE THERE TO HELP YOU
ANSWER:
CODE:
LDR R0,=0x2345ABCD
LDR R2,=0x0
bit_count_loop:
MOVS r0,r0,LSR #1
ADC r1,r1,r2
BNE bit_count_loop
Explanatiuon:-
we are just shifting the first bit of register R0 with 1 place.So,that the first bits goes to carry bit
and it will added by adc command in r1 and r2 is zero.ADC r1=r1+r2+Carry => r1=r1+Carry . BNE will check the flags set by MOVS
THANKS
Add Answer to:
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