Use the following codes as the beginning of your program. Write a sort program to sort these ten numbers from largest to smallest, then save them to memory. For ARMSim#, the sorted number also need to be displayed in the console and LCD screen (use the Embest Board Plug‐In). MOV r0, #0x00002000 MOV r1, #18 STR r1, [r0],#4 MOV r1, #6 STR r1, [r0],#4 MOV r1, #2 STR r1, [r0],#4 MOV r1, #8 STR r1, [r0],#4 MOV r1, #16 STR r1, [r0],#4 MOV r1, #10 STR r1, [r0],#4 MOV r1, #14 STR r1, [r0],#4 MOV r1, #4 STR r1, [r0],#4 MOV r1, #20 STR r1, [r0],#4 MOV r1, #12 STR r1, [r0],#4
时间: 2023-07-02 16:12:42 浏览: 88
Sure, here's a sample program in ARM assembly language that sorts the 10 numbers in descending order using the bubble sort algorithm and saves them to memory starting from the address 0x00002000. The sorted numbers are also displayed in the console and LCD screen using the Embest Board Plug-In.
```
; Define constants
MEMORY_START EQU 0x00002000
NUM_ELEMENTS EQU 10
LCD_BASE_ADDRESS EQU 0x12345678 ; Replace with actual address
CONSOLE_BASE_ADDRESS EQU 0x87654321 ; Replace with actual address
; Define variables
array SPACE NUM_ELEMENTS * 4
temp SPACE 4
; Main program
MOV r0, #MEMORY_START ; r0 = starting address of array
LDR r1, =array ; r1 = address of array
LDR r2, =NUM_ELEMENTS ; r2 = number of elements in array
BL bubble_sort ; Sort the array
BL display_numbers ; Display the sorted numbers
exit:
B exit ; Infinite loop
; Bubble sort implementation
bubble_sort:
PUSH {r4, lr} ; Save registers
MOV r3, #1 ; Boolean value to indicate when a swap has occurred
outer_loop:
MOV r4, #0 ; Clear the swap flag
MOV r5, #1 ; r5 = index of first element
inner_loop:
CMP r5, r2 ; Compare r5 with number of elements
BGE outer_loop ; If r5 >= number of elements, exit inner loop
LDR r6, [r1, r5, LSL #2] ; r6 = array[r5]
LDR r7, [r1, r5-1, LSL #2] ; r7 = array[r5-1]
CMP r6, r7 ; Compare array[r5] with array[r5-1]
BGE no_swap ; If array[r5] >= array[r5-1], no need to swap
STR r6, [r1, r5-1, LSL #2] ; Swap array[r5] and array[r5-1]
STR r7, [r1, r5, LSL #2]
MOV r4, #1 ; Set the swap flag
no_swap:
ADD r5, r5, #1 ; Increment the index
B inner_loop ; Continue inner loop
CMP r4, #1 ; Check if a swap has occurred
BNE outer_loop ; If no swap, the array is sorted
POP {r4, pc} ; Restore registers and return
; Display the sorted numbers in console and LCD screen
display_numbers:
PUSH {r4, lr} ; Save registers
MOV r4, #0 ; r4 = index of first element
display_loop:
CMP r4, r2 ; Compare r4 with number of elements
BGE exit_display ; If r4 >= number of elements, exit display loop
LDR r5, [r1, r4, LSL #2] ; r5 = array[r4]
BL display_console ; Display the number in console
BL display_lcd ; Display the number in LCD
ADD r4, r4, #1 ; Increment the index
B display_loop ; Continue display loop
exit_display:
POP {r4, pc} ; Restore registers and return
; Display a number in console
display_console:
; Code to display the number in console using the CONSOLE_BASE_ADDRESS
; Replace with actual code
BX lr ; Return
; Display a number in LCD screen
display_lcd:
; Code to display the number in LCD using the LCD_BASE_ADDRESS
; Replace with actual code
BX lr ; Return
```
Please note that this is just a sample program, and it may not work as-is in your specific environment. You may need to adjust the memory addresses and display functions based on your hardware and software setup.
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