main.s

一个关于AVR单片机的例程

	.module main.c
	.area text(rom, con, rel)
	.dbfile D:\AVR与虚拟仪器光盘\教程与范例代码\LED应用\跑马灯\main.c
	.dbfunc e port_init _port_init fV
	.even
_port_init::
	.dbline -1
	.dbline 17
; //ICC-AVR application builder : 2007-1-29 10:04:38
; // Target : M16
; // Crystal: 7.3728Mhz
; // 作者：古欣
; // AVR与虚拟仪器 http://www.avrvi.com
; 
; #include <iom16v.h>
; #include <macros.h>
; 
; #define led_port PORTA
; //定义输出端口
; #define led_ddr DDRA
; //定义输出控制寄存器
; //可以自行修改，必须保持 led_port和led_ddr一致，PORTA对应DDRA
; 
; void port_init(void)
; {
	.dbline 18
;  PORTA = 0x00;
	clr R2
	out 0x1b,R2
	.dbline 19
;  DDRA  = 0x00;
	out 0x1a,R2
	.dbline 20
;  PORTB = 0x00;
	out 0x18,R2
	.dbline 21
;  DDRB  = 0x00;
	out 0x17,R2
	.dbline 22
;  PORTC = 0x00; //m103 output only
	out 0x15,R2
	.dbline 23
;  DDRC  = 0x00;
	out 0x14,R2
	.dbline 24
;  PORTD = 0x00;
	out 0x12,R2
	.dbline 25
;  DDRD  = 0x00;
	out 0x11,R2
	.dbline 26
;  led_ddr=0xff; //设置LED的端口为输出
	ldi R24,255
	out 0x1a,R24
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e init_devices _init_devices fV
	.even
_init_devices::
	.dbline -1
	.dbline 32
; }
; 
; //call this routine to initialize all peripherals
; //此处为ICC系统生成，未做更改
; void init_devices(void)
; {
	.dbline 34
;  //stop errant interrupts until set up
;  CLI(); //disable all interrupts
	cli
	.dbline 35
;  port_init();
	xcall _port_init
	.dbline 37
; 
;  MCUCR = 0x00;
	clr R2
	out 0x35,R2
	.dbline 38
;  GICR  = 0x00;
	out 0x3b,R2
	.dbline 39
;  TIMSK = 0x00; //timer interrupt sources
	out 0x39,R2
	.dbline 40
;  SEI(); //re-enable interrupts
	sei
	.dbline -2
L2:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e Delay _Delay fV
;              i -> R16
;              j -> R18
	.even
_Delay::
	.dbline -1
	.dbline 45
;  //all peripherals are now initialized
; }
; 
; void Delay(void)  //延时，没有详细计算
; {
	.dbline 47
; unsigned char i,j;
; for(i=20;i>0;i--)
	ldi R16,20
	xjmp L7
L4:
	.dbline 48
; {
	.dbline 49
;   for(j=200;j>0;j--)
	ldi R18,200
	xjmp L11
L8:
	.dbline 50
L9:
	.dbline 49
	dec R18
L11:
	.dbline 49
	clr R2
	cp R2,R18
	brlo L8
	.dbline 51
L5:
	.dbline 47
	dec R16
L7:
	.dbline 47
	clr R2
	cp R2,R16
	brlo L4
	.dbline -2
L3:
	.dbline 0 ; func end
	ret
	.dbsym r i 16 c
	.dbsym r j 18 c
	.dbend
	.dbfunc e main _main fV
;              j -> R20
;              i -> R22
;              k -> R10
	.even
_main::
	.dbline -1
	.dbline 55
; ;
; }
; }
; 
; void main()
; {
	.dbline 57
;  unsigned char i,j,k; //定义变量
;  init_devices();      //初始化
	xcall _init_devices
	xjmp L14
L13:
	.dbline 59
;  while(1)
;  {
	.dbline 60
;      i=1;
	ldi R22,1
	.dbline 61
;      for (j=0;j<8;j++) //循环8次，即PA0~~PA7轮流闪亮 
	clr R20
	xjmp L19
L16:
	.dbline 62
;       {
	.dbline 63
;         led_port=~i; //反相输出,低电平有效 位操作指令详解：http://bbs.avrvi.com/read.php?fid=30&tid=392&toread=1 
	mov R2,R22
	com R2
	out 0x1b,R2
	.dbline 64
	clr R10
	xjmp L23
L20:
	.dbline 64
	xcall _Delay
L21:
	.dbline 64
	inc R10
L23:
	.dbline 64
	mov R24,R10
	cpi R24,10
	brlo L20
	.dbline 65
	lsl R22
	.dbline 74
L17:
	.dbline 61
	inc R20
L19:
	.dbline 61
	cpi R20,8
	brlo L16
	.dbline 75
L14:
	.dbline 58
	xjmp L13
X0:
	.dbline -2
L12:
	.dbline 0 ; func end
	ret
	.dbsym r j 20 c
	.dbsym r i 22 c
	.dbsym r k 10 c
	.dbend