;---------------------------------------------------------------------------------------------------- ;---------------------------------------------------------------------------------------------------- ;Program to sort an array of number using the Bubble Sort algorithm in ascending order. ;---------------------------------------------------------------------------------------------------- ;Input Location: 9000h ;Output Location: 9000h itself ;Number of elementS: 010h ;In the bubble sort algorithm, adjacent elements are compared and sorted with respect to each other. ;This process is done repeatedly starting from the first element everytime till the array is sorted. ;Here's an example. The numbers in the array currently being compared are enclosed in quotes: ;Given array: (5,1,8,2) ;First Pass: ; ("5,3",8,2) -> ("3,5",8,2) -Swap 5 and 3 since 5 is greater. ; (3,"5,8",2) -> (3,"5,8",2) -5 and 8 are in order so don't swap them. Move on. ; (3,5,"8,2") -> (3,5,"2,8") -8 is greater - swap it's position with 2. ;Second Pass: ; ("3,5",2,8) -> ("3,5",2,8) -3 and 5 are in order. Do nothing and move on. ; (3,"5,2",8) -> (3,"2,5",8) -5 is greater swap 2's and 5's positions. ;Third Pass: ; ("2,3",5,8) -> ("2,3",5,8) -3 is greater so swap. ;This sorts the array as (2,3,5,8) which is in ascending order. Notice that the number of passes is ;one less than the number of elements in the array and number of iterations in each pass is the ;total number of elements minus the current pass number. ;---------------------------------------------------------------------------------------------------- ;---------------------------------------------------------------------------------------------------- ORG 00h ;-----------------------------------Data Required for the Program------------------------------------ MOV R0, #0Fh ;Counter for LOOP1 ;----------------------------Sort in Ascending Order Using Bubble Sort------------------------------- LOOP1: ;Outer Loop - Handles number of passes MOV DPTR, #9000h ;Point to beginning of array MOV A, R0 ;Initialize R1 - the counter for LOOP2 MOV R1, A ;to the value of R0 - the number of iterations in each pass is same ;as the number of elements minus serial number of the current pass. LOOP2: ;Inner Loop - Handles each pass. MOVX A, @DPTR ;Copy a number of the array to the accumulator MOV R2, A ;and store it in R2. INC DPTR ;Move to the net number MOVX A, @DPTR ;and store that in the accumulator. SUBB A, R2 ;Subtract the first from the second. JNC Continue2 ;If no carry is generated the second is greater and the numbers are ;in order with respect to each other. Otherwise they must be swapped. SwapNumbers: MOVX A, @DPTR ;Move the second number to the accumulator. XCH A, R2 ;Exchange contents of the accumulator and R2. This makes A contain ;the first number and R2 the second. MOVX @DPTR, A ;Store the first number at the place where the second one was stored. DEC DPL ;Move to the previous memory location. MOV A, R2 ;Copy the second number to the accumulator MOVX @DPTR, A ;and store it in the first number's place. INC DPTR ;Move to the next memory location. Continue2: DJNZ R1, LOOP2 ;Move on to the next iteration of the current pass. Continue1: DJNZ R0, LOOP1 ;Move on to the next pass. Here: SJMP Here ;End of program - Loop here indefinitely. END ;---------------------------------------------------------------------------------------------------- ;----------------------------------------------------------------------------------------------------

# 8051 Assembly - Bubble Sort

Page 1 of 1## 4 Replies - 28264 Views - Last Post: 01 August 2010 - 09:58 AM

### #1

# 8051 Assembly - Bubble Sort

Posted 17 July 2008 - 08:45 AM

Description: You can try this program out in a simulator such as Keil uVision3 or any other 8051 simulator.You can see how to use quite a few instructions here of the 8051 instruction set.

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**Replies To:** 8051 Assembly - Bubble Sort

### #2

## Re: 8051 Assembly - Bubble Sort

Posted 27 March 2010 - 05:44 AM

the programme is very easy to understand,it was written in a simple form but some print mistakes are present in this programme please check it out and correct it,thank you.

### #4

## Re: 8051 Assembly - Bubble Sort

Posted 30 May 2010 - 07:23 AM

thank yo so much is an amazing explanation...i under stood it vry wel.....

### #5

## Re: 8051 Assembly - Bubble Sort

Posted 01 August 2010 - 09:58 AM

i need a program that checks the number stored in an internal ram , and buzzes when a negative number is detected

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