AREA mydata,DATA output SPACE 50 AREA mycode,CODE,ALIGN=2 THUMB EXPORT __main input DCB "The QUICK brown fOx",0 DCD 0 __main PROC LDR R0,=input ;R0 has input ptr LDR R1,=output ;R1 has output ptr loop LDRB R2,[R0] ;R2 has the next character CBZ R2,exit ;if r2 == 0 goto exit STRB R2,[R1] ;store R2 @ R1 (output ptr) ADD R0,#1 ;add 1 to both pointers ADD R1,#1 B loop ;do the next character exit MOV R2,#0 ;put in my byte of zero STRB R2,[R1] done B done ;end ENDP END 

Given the code below as a starter convert a string of text from upper case to lower case or from lower case to upper case. Your destination string should have a byte of zeros following it. Assume that the input string is no more than 49 characters long. You should produce the assignment in ARM assembly with Keil uvision.

Assembly language