blockcmp.asm

SUNPLUS的8BIT的MCU SPMC65X基本功能函数库及使用说明

;==================================================================================
; The information contained herein is the exclusive property of
; Sunplus Technology Co. And shall not be distributed, reproduced,
; or disclosed in whole in part without prior written permission.
;       (C) COPYRIGHT 2004   SUNPLUS TECHNOLOGY CO.                                  
;                   ALL RIGHTS RESERVED
; The entire notice above must be reproduced on all authorized copies.
;==================================================================================
																					
;==================================================================================
;  Program Name		:	BlockCmp.asm
;  Description		:	This program presents that compares the contents of one block 
;                       with another. 		 
;  Reference		:	SPMC65P2404A/2408A Data Sheet
;  Revision history	:
;---------------------------------------------------------------------------------- 
;  Version		Date 		Description
;  1.0.0    	2004-9-9	First Edition
;==================================================================================

.SYNTAX  6502							;process standard 6502 addressing syntax
.LINKLIST								;generate linklist information
.SYMBOLS								;generate symbolic debug information
;************************************************************************************
C_LIB_DEF		EQU		1
.INCLUDE		AN_O0100.inc			;Define	external variable
;**********************************************************************************
.PAGE0
.DATA									;define data storage section
;**********************************************************************************
.CODE
;==================================================================================
;	Function:		F_BlockCmp
;	Description:	compares the contents of one block with another
;	Input:			X------------------the size of block
;					GB_SourceAddr------starting address of blockX
;					GB_TargetAddr------starting address of blockY
;	Output:         Z------if the two block is equal,Z=1; else 0.
;	Destroy:        A,X,Y
;	Stacks:         1
;==================================================================================
.PUBLIC		F_BlockCmp
F_BlockCmp:
		ldy		#0
?L_Cmp_Loop:		
		lda		(GB_SourceAddr),y	;reach data from blockX
		cmp		(GB_TargetAddr),y	;compare data with blockY,equal?
		bne		?L_NotSame       	;no
		iny
		dex							;compare end?
		bne		?L_Cmp_Loop			;no			
		lda		#0					;two block are same ,Z=1.
		jmp		?L_Cmp_End
?L_NotSame:		
		lda		#1					;two block are not same,Z=0.
?L_Cmp_End:
        rts