求一汇编小程序！用ARM汇编语言完成一个C语言嵌入式汇编方式实现字符串（数组）拷贝的功能

#include<reg51.h>

#include<stdio.h>

#include<string.h>

#define INBUF_LEN 4 //数据长度

unsigned char inbuf1[INBUF_LEN]

unsigned char checksum,count3 , flag,temp,ch

bit read_flag=0

sbit cp=P1^1

sbit DIR=P1^2

int i

unsigned int xdata *RAMDATA/*定义RAM地址指针*/

unsigned char a[6] ={0x11,0x22,0x33,0x44,0x55,0x66}

void init_serialcomm(void)

{

SCON=0x50//在11.0592MHz下，设置串行口波特率为9600，方式1,并允许接收

PCON=0x00

ES=1

TMOD=0x21//定时器工作于方式2，自动装载方式

TH0=(65536-1000)%256

TL0=(65536-1000)/256

TL1=0xfd

TH1=0xfd

ET0=1

TR0=1

TR1=1

// TI=0

EA=1

// TI=1

RAMDATA=0x1F45

}

void serial () interrupt 4 using 3

{

if(RI)

{ RI=0

ch=SBUF

TI=1//置SBUF空

switch(ch)

{

case 0x01 :printf("A")TI=0break

case 0x02 :printf("B")TI=0break

case 0x03 :printf("C")TI=0break

case 0x04 :printf("D")TI=0break

default :printf("fg")TI=0break

}

}

}

//向串口发送一个字符

void timer0() interrupt 1 using 3{

// char i

flag++

TH0=0x00

TL0=0x00

if(flag==10)

{// cp=!cp

// for(i=0i<6i++)

P2=0x25

TI=1

temp=*RAMDATA

printf("%c",temp)

TI=0

// RAMDATA--

flag=0

}

}

//主程序

main()

{

init_serialcomm()//初始化串口

//向6264中送数据

{

*RAMDATA=0x33

}

while(1)

{

*RAMDATA=0x33

}

}

AREA StrCopy, CODE, READONLY

ENTRY mark the first instruction to call

start

LDR r1, =srcstr pointer to first string

LDR r0, =dststr pointer to second string

BL strcopy

call subroutine to do copy

stop

MOV r0,

#0x18

LDR r1,

=0x20026

SWI

0x123456

strcopy

LDRB r2, [r1],#1

STRB r2, [r0],#1

CMP r2, #0

BNE strcopy

MOV pc,lr

Return

AREA Strings, DATA, READWRITE

srcstr DCB First string - source,0

dststr DCB Second string - destination,0

END

试试，

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