delay.s

AVR单片机系统开发经典实例部分源程序

	.module Delay.c
	.area text(rom, con, rel)
	.dbfile C:\AVR\M\1\Delay.c
	.dbfunc e delay_ms _delay_ms fV
;              i -> R10,R11
;              t -> y+10
	.even
_delay_ms::
	xcall push_arg4
	xcall push_gset3
	sbiw R28,4
	.dbline -1
	.dbline 6
; 
; 
; #include "Delay.h"
; 
; void delay_ms(unsigned long int  t)
; {
	xjmp L3
L2:
	.dbline 9
; 	unsigned short int i;
; 	while(t--)
; 	{
	.dbline 10
; 	  i=2000;
	ldi R24,2000
	ldi R25,7
	movw R10,R24
L5:
	.dbline 11
L6:
	.dbline 11
	movw R2,R10
	movw R24,R2
	sbiw R24,1
	movw R10,R24
	tst R2
	brne L5
	tst R3
	brne L5
X0:
	.dbline 12
L3:
	.dbline 8
	movw R30,R28
	ldd R2,z+10
	ldd R3,z+11
	ldd R4,z+12
	ldd R5,z+13
	movw R30,R28
	std z+0,R2
	std z+1,R3
	std z+2,R4
	std z+3,R5
	ldi R20,1
	ldi R21,0
	ldi R22,0
	ldi R23,0
	movw R30,R28
	ldd R2,z+0
	ldd R3,z+1
	ldd R4,z+2
	ldd R5,z+3
	sub R2,R20
	sbc R3,R21
	sbc R4,R22
	sbc R5,R23
	movw R30,R28
	std z+10,R2
	std z+11,R3
	std z+12,R4
	std z+13,R5
	ldi R20,0
	ldi R21,0
	ldi R22,0
	ldi R23,0
	movw R30,R28
	ldd R2,z+0
	ldd R3,z+1
	ldd R4,z+2
	ldd R5,z+3
	cp R2,R20
	cpc R3,R21
	cpc R4,R22
	cpc R5,R23
	breq X1
	xjmp L2
X1:
	.dbline -2
L1:
	adiw R28,4
	xcall pop_gset3
	adiw R28,4
	.dbline 0 ; func end
	ret
	.dbsym r i 10 s
	.dbsym l t 10 l
	.dbend