icmp.s

AVR以太网开发板中的几个例子。文件中定义了网卡芯片的IP地址,默认值是192.168.0.99。

	.module icmp.c
	.area text(rom, con, rel)
	.dbfile D:\hexok项目\AVRNET项目\AVRNET光盘\icc例子\icmp.c
	.dbfunc e icmp_packhandle _icmp_packhandle fc
;         icmp_p -> R10,R11
;        icmp_sn -> R14,R15
;        icmp_id -> R20,R21
;    icmp_chksum -> R22,R23
;        icmplen -> y+12
;      icmpbegin -> y+10
	.even
_icmp_packhandle::
	xcall push_arg4
	xcall push_gset5
	.dbline -1
	.dbline 9
; #include "main.h"
; #include "rtl8019as.h"
; #include "arp.h"
; #include "ip.h"
; #include "icmp.h"
; #include "udp.h"
; 
; unsigned char icmp_packhandle(unsigned char *icmpbegin,unsigned int icmplen)
; {
	.dbline 11
;  //unsigned char icmp_typ=0;
;  unsigned int  icmp_chksum=0;
	clr R22
	clr R23
	.dbline 12
;  unsigned int  icmp_id=0;
	clr R20
	clr R21
	.dbline 13
;  unsigned int  icmp_sn=0;
	clr R14
	clr R15
	.dbline 17
;  //unsigned int  icmp_datalen=0;
;  unsigned int  *icmp_p;
;  
;  icmp_p=(unsigned int *)icmpbegin;
	ldd R10,y+10
	ldd R11,y+11
	.dbline 20
;  //icmp_datalen=(icmplen-8);
;   
;  switch((*icmpbegin))
	movw R30,R10
	ldd R12,z+0
	clr R13
	movw R24,R12
	cpi R24,8
	ldi R30,0
	cpc R25,R30
	breq L5
	xjmp L3
X0:
	.dbline 21
;  {
L5:
	.dbline 23
;   case 0x08:     //回应请求报文
;        icmp_id=(*(icmpbegin+4));
	ldd R30,y+10
	ldd R31,y+11
	ldd R20,z+4
	clr R21
	.dbline 24
; 	   icmp_id<<=8;
	mov R21,R20
	clr R20
	.dbline 25
; 	   icmp_id|=(*(icmpbegin+5));
	ldd R30,y+10
	ldd R31,y+11
	ldd R2,z+5
	clr R3
	or R20,R2
	or R21,R3
	.dbline 27
; 	   
; 	   icmp_sn=(*(icmpbegin+6));
	ldd R30,y+10
	ldd R31,y+11
	ldd R14,z+6
	clr R15
	.dbline 28
; 	   icmp_sn<<=8;
	mov R15,R14
	clr R14
	.dbline 29
; 	   icmp_sn|=(*(icmpbegin+7));
	ldd R30,y+10
	ldd R31,y+11
	ldd R2,z+7
	clr R3
	or R14,R2
	or R15,R3
	.dbline 31
; 	   
; 	   (*icmpbegin)=0x00;
	clr R2
	ldd R30,y+10
	ldd R31,y+11
	std z+0,R2
	.dbline 32
; 	   (*(icmpbegin+2))=0;
	std z+2,R2
	.dbline 33
;        (*(icmpbegin+3))=0;
	ldd R30,y+10
	ldd R31,y+11
	std z+3,R2
	.dbline 34
;        icmp_chksum=tsum(icmp_p,icmplen); //校验和的求法
	ldd R18,y+12
	ldd R19,y+13
	movw R16,R10
	xcall _tsum
	movw R22,R16
	.dbline 35
; 	   (*(icmpbegin+3))=(icmp_chksum>>8)&0xFF;
	movw R24,R22
	mov R24,R25
	clr R25
	andi R25,0
	ldd R30,y+10
	ldd R31,y+11
	std z+3,R24
	.dbline 36
; 	   (*(icmpbegin+2))=icmp_chksum&0xFF;	   	   
	movw R24,R22
	andi R25,0
	ldd R30,y+10
	ldd R31,y+11
	std z+2,R24
	.dbline 37
;        break;
	.dbline 39
; 	   
;   default:break;
L3:
	.dbline 41
;  }
;  return 1;
	ldi R16,1
	.dbline -2
L1:
	xcall pop_gset5
	adiw R28,4
	.dbline 0 ; func end
	ret
	.dbsym r icmp_p 10 pi
	.dbsym r icmp_sn 14 i
	.dbsym r icmp_id 20 i
	.dbsym r icmp_chksum 22 i
	.dbsym l icmplen 12 i
	.dbsym l icmpbegin 10 pc
	.dbend