delay.s

一个关于AVR单片机的例程

	.module delay.c
	.area text(rom, con, rel)
	.dbfile D:\桌面\interrupt_wake_keyboard_4-4\delay.c
	.dbfunc e delay_us _delay_us fV
;           time -> R16,R17
	.even
_delay_us::
	.dbline -1
	.dbline 5
; #include <iom16v.h>
; #include <macros.h>
; extern void delay_us (int time);
; void delay_us (int time)//微秒级延时
; {do
L2:
	.dbline 6
;  time--;
	subi R16,1
	sbci R17,0
L3:
	.dbline 7
;  while(time>0);
	clr R2
	clr R3
	cp R2,R16
	cpc R3,R17
	brlt L2
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbsym r time 16 I
	.dbend
	.dbfunc e delay_ms _delay_ms fV
;           time -> R20,R21
	.even
_delay_ms::
	xcall push_gset1
	movw R20,R16
	.dbline -1
	.dbline 10
; }
; extern void delay_ms (int time)//毫秒级延时
; {for(;time>0;time--)
	.dbline 10
	xjmp L9
L6:
	.dbline 11
	ldi R16,1000
	ldi R17,3
	xcall _delay_us
L7:
	.dbline 10
	subi R20,1
	sbci R21,0
L9:
	.dbline 10
	clr R2
	clr R3
	cp R2,R20
	cpc R3,R21
	brlt L6
	.dbline -2
L5:
	xcall pop_gset1
	.dbline 0 ; func end
	ret
	.dbsym r time 20 I
	.dbend