Write an MSP430 assembly language subroutine, REP_FREE, to examine the elements

Question

Write an MSP430

assembly language subroutine, REP_FREE, to examine the elements of a list of positive word_size numbers stored at location LIST_IN. the list is already sorted in an ascending order. the first element is the number, n, the length of the array. the subroutine will copy the elements from the location LIST_IN to the location LIST_OUT. while copying, if an element occurs more than once (repeated), then repeated copies are ignored. In essence, the subroutine eliminates the replicated element from LIST_IN and places the result in LIST_OUT. Note that you need to update number m (the first element on the top) which is the actual number of elements in LIST_OUT after eliminating replicates.

Thank You!

Explanation / Answer

#include "msp430.h" ; #define controlled include file

NAME main ; module name

PUBLIC main ; make the main label vissible

; outside this module

EXTERN suma_rp

ORG 0FFFEh

DC16 init ; set reset vector to 'init' label

RSEG CSTACK ; pre-declaration of segment

RSEG CODE ; place program in 'CODE' segment

init: MOV #SFE(CSTACK), SP ; set up stack

main: NOP ; main program

MOV.W #WDTPW+WDTHOLD,&WDTCTL ; Stop watchdog timer

BIS.B #0xFF,&P1DIR ; configure P1.x as output

BIS.B #0xFF,&P2DIR ; configure P2.x as output

BIS.B #0xFF,&P3DIR ; configure P3.x as output

BIS.B #0xFF,&P4DIR ; configure P4.x as output

MOV #arr1, R12 ; put address into R12

MOV #8, R13 ; put array length into R13

MOV #0, R14 ; display #0 (P1&P2)

CALL #suma_rp

MOV #arr2, R12 ; put address into R12

MOV #7, R13 ; put array length into R13

MOV #1, R14 ; display #0 (P3&P4)

CALL #suma_rp

JMP $

arr1 DC16 1, 2, 3, 4, 1, 2, 3, 4 ; the first array

arr2 DC16 1, 1, 1, 1, -1, -1, -1 ; the second array

END

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