main.s

cvavr m48 看门狗实验

	.module main.c
	.area text(rom, con, rel)
	.dbfile D:\AVR\我的程序\开门狗实验/cfg.h
	.dbfunc e delay_ms _delay_ms fV
;              i -> R20,R21
;           time -> R16,R17
	.even
_delay_ms::
	xcall push_gset1
	.dbline -1
	.dbline 10
; /*************************************************
; *实验目的：熟悉开门狗编程
; *设    计：萧联珠
; *日    期：2007-11-23
; *说    明：如果不及时喂狗，那么导致单片机不停复位。
; **************************************************/
; #include <iom16v.h>
; #include "cfg.h"
; #include <macros.h>
; 
	.dbline 12
; void main()
; {
	xjmp L5
L2:
	.dbline 13
	clr R20
	clr R21
L6:
	.dbline 13
L7:
	.dbline 13
	subi R20,255  ; offset = 1
	sbci R21,255
	.dbline 13
	cpi R20,232
	ldi R30,3
	cpc R21,R30
	brlt L6
L3:
	.dbline 12
	subi R16,1
	sbci R17,0
L5:
	.dbline 12
	clr R2
	clr R3
	cp R2,R16
	cpc R3,R17
	brlt L2
	.dbline -2
L1:
	xcall pop_gset1
	.dbline 0 ; func end
	ret
	.dbsym r i 20 I
	.dbsym r time 16 I
	.dbend
	.dbfunc e port_init _port_init fV
	.even
_port_init::
	.dbline -1
	.dbline 18
;   port_init();
;   WDTCR|=(1<<WDTOE)|(1<<WDE);          /* 置位 WDTOE 和 WDE*/
;   WDTCR=(1<<WDE)|(1<<WDP2)|(1<<WDP1);  /*设定周期为1S*/
;   
;   display();
;   
	.dbline 19
;   while(1)
	ldi R24,255
	out 0x17,R24
	.dbline 20
;   {
	out 0x18,R24
	.dbline -2
L10:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e display _display fV
;          index -> R20,R21
	.even
_display::
	xcall push_gset1
	.dbline -1
	.dbline 25
;    
;    PORTB=0xFE;
;    WDR();         /*喂狗，通过注释这句可以区别是否喂狗的区别*/
;    delay_ms(50);
;    PORTB=0xFF;
	.dbline 27
;    delay_ms(50);
;   }
	clr R20
	clr R21
L12:
	.dbline 28
	.dbline 29
	ldi R16,1
	ldi R17,0
	movw R18,R20
	xcall lsl16
	movw R2,R16
	com R2
	com R3
	out 0x18,R2
	.dbline 30
	ldi R16,10
	ldi R17,0
	xcall _delay_ms
	.dbline 31
L13:
	.dbline 27
	subi R20,255  ; offset = 1
	sbci R21,255
	.dbline 27
	cpi R20,8
	ldi R30,0
	cpc R21,R30
	brlt L12
	.dbline -2
L11:
	xcall pop_gset1
	.dbline 0 ; func end
	ret
	.dbsym r index 20 I
	.dbend
	.dbfile D:\AVR\我的程序\开门狗实验\main.c
	.dbfunc e main _main fV
	.even
_main::
	.dbline -1
	.dbline 12
	.dbline 13
	xcall _port_init
	.dbline 14
	in R24,0x21
	ori R24,24
	out 0x21,R24
	.dbline 15
	ldi R24,14
	out 0x21,R24
	.dbline 17
	xcall _display
	xjmp L18
L17:
	.dbline 20
	.dbline 22
	ldi R24,254
	out 0x18,R24
	.dbline 23
	wdr
	.dbline 24
	ldi R16,50
	ldi R17,0
	xcall _delay_ms
	.dbline 25
	ldi R24,255
	out 0x18,R24
	.dbline 26
	ldi R16,50
	ldi R17,0
	xcall _delay_ms
	.dbline 27
L18:
	.dbline 19
	xjmp L17
X0:
	.dbline -2
L16:
	.dbline 0 ; func end
	ret
	.dbend