main.s

一个关于AVR单片机的例程

	.module main.c
	.area text(rom, con, rel)
	.dbfile D:\桌面\实验教程\LED应用\PWM控制LED亮度\main.c
	.dbfunc e port_init _port_init fV
	.even
_port_init::
	.dbline -1
	.dbline 9
; //ICC-AVR application builder : 2007-1-31 21:10:52
; // Target : M16
; // Crystal: 7.3728Mhz
; 
; #include <iom16v.h>
; #include <macros.h>
; 
; void port_init(void)
; {
	.dbline 10
;  PORTA = 0x00;
	clr R2
	out 0x1b,R2
	.dbline 11
;  DDRA  = 0x00;
	out 0x1a,R2
	.dbline 12
;  PORTB = 0x00;
	out 0x18,R2
	.dbline 13
;  DDRB  = 0x08;
	ldi R24,8
	out 0x17,R24
	.dbline 14
;  PORTC = 0x00; //m103 output only
	out 0x15,R2
	.dbline 15
;  DDRC  = 0x00;
	out 0x14,R2
	.dbline 16
;  PORTD = 0x00;
	out 0x12,R2
	.dbline 17
;  DDRD  = 0x00;
	out 0x11,R2
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.area vector(rom, abs)
	.org 76
	jmp _timer0_comp_isr
	.area text(rom, con, rel)
	.dbfile D:\桌面\实验教程\LED应用\PWM控制LED亮度\main.c
	.dbfunc e timer0_comp_isr _timer0_comp_isr fV
	.even
_timer0_comp_isr::
	.dbline -1
	.dbline 22
; }
; 
; #pragma interrupt_handler timer0_comp_isr:20
; void timer0_comp_isr(void)
; {
	.dbline -2
L2:
	.dbline 0 ; func end
	reti
	.dbend
	.dbfunc e timer0_init _timer0_init fV
	.even
_timer0_init::
	.dbline -1
	.dbline 31
;  //compare occured TCNT0=OCR0
; }
; 
; //TIMER0 initialize - prescale:64
; // WGM: CTC
; // desired value: 1KHz
; // actual value:  0.993KHz (-0.7%)
; void timer0_init(void)
; {
	.dbline 32
;  TCCR0 = 0x00; //stop
	clr R2
	out 0x33,R2
	.dbline 33
;  TCNT0 = 0x8D; //set count
	ldi R24,141
	out 0x32,R24
	.dbline 34
;  OCR0  = 0x73;  //set compare
	ldi R24,115
	out 0x3c,R24
	.dbline 35
;  TCCR0 = 0x0B; //start timer
	ldi R24,11
	out 0x33,R24
	.dbline -2
L3:
	.dbline 0 ; func end
	ret
	.dbend
	.area vector(rom, abs)
	.org 36
	jmp _timer0_ovf_isr
	.area text(rom, con, rel)
	.dbfile D:\桌面\实验教程\LED应用\PWM控制LED亮度\main.c
	.dbfunc e timer0_ovf_isr _timer0_ovf_isr fV
	.even
_timer0_ovf_isr::
	st -y,R24
	in R24,0x3f
	st -y,R24
	.dbline -1
	.dbline 40
; }
; 
; #pragma interrupt_handler timer0_ovf_isr:10
; void timer0_ovf_isr(void)
; {
	.dbline 41
;  TCNT0 = 0x8D; //reload counter value
	ldi R24,141
	out 0x32,R24
	.dbline -2
L4:
	ld R24,y+
	out 0x3f,R24
	ld R24,y+
	.dbline 0 ; func end
	reti
	.dbend
	.dbfunc e init_devices _init_devices fV
	.even
_init_devices::
	.dbline -1
	.dbline 46
; }
; 
; //call this routine to initialize all peripherals
; void init_devices(void)
; {
	.dbline 48
;  //stop errant interrupts until set up
;  CLI(); //disable all interrupts
	cli
	.dbline 49
;  port_init();
	xcall _port_init
	.dbline 50
;  timer0_init();
	xcall _timer0_init
	.dbline 52
; 
;  MCUCR = 0x00;
	clr R2
	out 0x35,R2
	.dbline 53
;  GICR  = 0x00;
	out 0x3b,R2
	.dbline 54
;  TIMSK = 0x01; //timer interrupt sources
	ldi R24,1
	out 0x39,R24
	.dbline 55
;  SEI(); //re-enable interrupts
	sei
	.dbline -2
L5:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e main _main fV
	.even
_main::
	.dbline -1
	.dbline 60
;  //all peripherals are now initialized
; }
; 
; void main()
; {
	.dbline 61
;  init_devices();
	xcall _init_devices
	.dbline -2
L6:
	.dbline 0 ; func end
	ret
	.dbend