; Filename:     HW2prob6.s
; Author:       Eric Hoffman 
; Description:  Solution to bunch of random meaningless tasks

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;; Constant definitions below: ;;
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;; Assembler Driectives below: ;;
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	AREA    FLASH, CODE, READONLY
	ARM

	INCLUDE ADuC7026.inc			;MMR definitions
	EXPORT  __main				 	;Export __main so linker can find definition

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;; Allocate any code space constants next ;;
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src			DCD	0x00010203,0x04050607,0x08090A0B,0x0C0D0E0F

; main program start
__main

main_loop
		;;;;;;;;; Part a below ;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		LDR		R6,	=src				;R6 will be a pointer to source
		LDR		R7, =dest1				;R7 will be a pointer to dest1
		ADD		R5, R6, #16				;R5 is address of last last src byte + 1
byt_mv	LDRB	R4,	[R6], #1			;Read byte at R6 and increment pointer to next byte
		CMP		R4, #0x0A				;Compare to 0x0A
		MVNCS	R4, R4					;Complement byte if Higher or same
		STRB	R4, [R7], #1			;Store byte into dest1 area
		CMP		R6, R5					;compare current pointer to end
		BNE		byt_mv					;if not done, keep going
	  	;;;;;;;;; Part b below ;;;;;;;;;;;;;;;;;;;;;;;;;;;
		LDR		R6,	=src				;R6 will be a pointer to source
		LDR		R7, =dest2				;R7 will be a pointer to dest2
		LDMIA	R6, {R0,R1,R2,R3}		;Load up all 4 words in {R0,R1,R2,R3}
		STMIA	R7, {R0,R1,R2,R3}		;Store off all 4 words at dest2 location

		B		main_loop

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;; Allocate any data in the SRAM area next ;;
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	AREA	SRAM,	DATA,	READWRITE		; use area directive with type DATA

dest1	SPACE	16				;allocate space for 4 words of dest1
dest2 	SPACE	16				;allocate space for 4 words of dest2

	END