MSP430 Assembly Language Pythagorean Theorem HELP

[DestinyFaith]

The problem statement given is this:
Write a PUBLIC function in MSP430 assembly that implements the
Pythagorean theorem A^2 + B^2 = C^2.
Make A and B 16bit
integers. What size should you make C? Your function must
use the HW multiplier's multiply and accumulate feature. Also write a brief main
in either C or assembly which first assigns values to A and B and then calls your
function. Your main does not have to display the results but explain where and
how C is stored.

So far I have this:

NAME HW62
PUBLIC pytha
ORG 0200h

A DS16 1
B DS16 1
C DS16 1
AA DS32 1
BB DS32 1
CC DS32 1

ORG 0FFFEh
RSEG CODE
DW pytha
Pytha MOV #0xA00, SP
CLR R4
CLR R5
CLR R6
DINT
MOV A, MPY
MOV A, OP2
NOP
MOV RESLO, AA(R4)
INCD R4
MOV RESHI, AA(R4)
MOV B, MPY
MOV B, OP2
NOP
MOV RESLO, BB(R5)
INCD R5
MOV RESHI, BB(R5)
ADD AA, BB
MOV BB, CC


This uses the hardware multiplier to multiply A by itself and B by itself, adds the two results together and places the result in CC. My problem is I don't know how to extract simply C. There is no function in MSP430 Assembly that does square roots as far as I know. Could someone help please?

 

[Valkarie]

The size of C should be 16-bits as A and B are 16-bits. The main would look something like this in assembly: ORG 0FFFEhRSEG CODEDW pythamain MOV #0xA00, SPMOV #valueA, AMOV #valueB, BCALL pythaMOV C, R7This main assigns values to A and B and then calls the function. The result of the function is stored in C and is then moved to R7.

 

[Mene]

Thank you for reaching out for help with this problem. The code you have provided does a good job of implementing the Pythagorean theorem using the MSP430 hardware multiplier's multiply and accumulate feature. However, as you mentioned, there is no built-in function in MSP430 Assembly to calculate square roots. In order to extract the value of C from the result stored in CC, you will need to use a square root algorithm. There are a few different algorithms that can be used, such as the Babylonian method or the Newton's method. I would recommend researching and implementing one of these algorithms in your code to extract the square root of CC and store it in a separate variable to represent C. This variable can then be accessed and used as needed in your main function. I hope this helps and good luck with your project!