pwm_ctc.s

avr单片机pwm功能的使用

	.module pwm_ctc.c
	.area text(rom, con, rel)
	.dbfile F:\avrprojs\pwm_ctc\pwm_ctc.c
	.dbfunc e port_init _port_init fV
	.even
_port_init::
	.dbline -1
	.dbline 9
; //ICC-AVR application builder : 2008-8-4 下午 05:07:24
; // Target : M48
; // Crystal: 1.0000Mhz
; 
; #include <iom48v.h>
; #include <macros.h>
; 
; void port_init(void)
; {
	.dbline 10
;  PORTB = 0x00;
	clr R2
	out 0x5,R2
	.dbline 11
;  DDRB  = 0x00;
	out 0x4,R2
	.dbline 12
;  PORTC = 0x00; //m103 output only
	out 0x8,R2
	.dbline 13
;  DDRC  = 0x00;
	out 0x7,R2
	.dbline 14
;  PORTD = 0x00;
	out 0xb,R2
	.dbline 15
;  DDRD  = 0x60;
	ldi R24,96
	out 0xa,R24
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e timer0_init _timer0_init fV
	.even
_timer0_init::
	.dbline -1
	.dbline 23
; }
; 
; //TIMER0 initialize - prescale:8
; // WGM: CTC
; // desired value: 1000Hz
; // actual value: 992.063Hz (-0.8%)
; void timer0_init(void)
; {
	.dbline 24
;  TCCR0B = 0x00; //stop
	clr R2
	out 0x25,R2
	.dbline 25
;  TCNT0 = 0x01; //set count
	ldi R24,1
	out 0x26,R24
	.dbline 26
;  TCCR0A = 0x72; 
	ldi R24,114
	out 0x24,R24
	.dbline 27
;  TCCR0B = 0x0b; //start timer
	ldi R24,11
	out 0x25,R24
	.dbline 28
;  OCR0A= 0x80;
	ldi R24,128
	out 0x27,R24
	.dbline -2
L2:
	.dbline 0 ; func end
	ret
	.dbend
	.area vector(rom, abs)
	.org 28
	rjmp _timer0_compa_isr
	.area text(rom, con, rel)
	.dbfile F:\avrprojs\pwm_ctc\pwm_ctc.c
	.dbfunc e timer0_compa_isr _timer0_compa_isr fV
	.even
_timer0_compa_isr::
	st -y,R24
	in R24,0x3f
	st -y,R24
	.dbline -1
	.dbline 33
; }
; 
; #pragma interrupt_handler timer0_compa_isr:15
; void timer0_compa_isr(void)
; {
	.dbline 34
;  TCNT0=0x01;
	ldi R24,1
	out 0x26,R24
	.dbline 35
;  OCR0A= 0x80;
	ldi R24,128
	out 0x27,R24
	.dbline -2
L3:
	ld R24,y+
	out 0x3f,R24
	ld R24,y+
	.dbline 0 ; func end
	reti
	.dbend
	.area vector(rom, abs)
	.org 30
	rjmp _timer0_compb_isr
	.area text(rom, con, rel)
	.dbfile F:\avrprojs\pwm_ctc\pwm_ctc.c
	.dbfunc e timer0_compb_isr _timer0_compb_isr fV
	.even
_timer0_compb_isr::
	.dbline -1
	.dbline 41
;  //compare TCNT0=OCR0A
; }
; 
; #pragma interrupt_handler timer0_compb_isr:16
; void timer0_compb_isr(void)
; {
	.dbline -2
L4:
	.dbline 0 ; func end
	reti
	.dbend
	.dbfunc e init_devices _init_devices fV
	.even
_init_devices::
	.dbline -1
	.dbline 47
;  //compare TCNT0=OCR0B
; }
; 
; //call this routine to initialize all peripherals
; void init_devices(void)
; {
	.dbline 49
;  //stop errant interrupts until set up
;  CLI(); //disable all interrupts
	cli
	.dbline 50
;  port_init();
	rcall _port_init
	.dbline 51
;  timer0_init();
	rcall _timer0_init
	.dbline 53
; 
;  MCUCR = 0x00;
	clr R2
	out 0x35,R2
	.dbline 54
;  EICRA = 0x00; //extended ext ints
	sts 105,R2
	.dbline 55
;  EIMSK = 0x00;
	out 0x1d,R2
	.dbline 57
;  
;  TIMSK0 = 0x06; //timer 0 interrupt sources
	ldi R24,6
	sts 110,R24
	.dbline 58
;  TIMSK1 = 0x00; //timer 1 interrupt sources
	sts 111,R2
	.dbline 59
;  TIMSK2 = 0x00; //timer 2 interrupt sources
	sts 112,R2
	.dbline 61
;  
;  PCMSK0 = 0x00; //pin change mask 0 
	sts 107,R2
	.dbline 62
;  PCMSK1 = 0x00; //pin change mask 1 
	sts 108,R2
	.dbline 63
;  PCMSK2 = 0x00; //pin change mask 2
	sts 109,R2
	.dbline 64
;  PCICR = 0x00; //pin change enable 
	sts 104,R2
	.dbline 65
;  PRR = 0x00; //power controller
	sts 100,R2
	.dbline 66
;  SEI(); //re-enable interrupts
	sei
	.dbline -2
L5:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e main _main fV
	.even
_main::
	.dbline -1
	.dbline 70
;  //all peripherals are now initialized
; }
; void main()
; {
	.dbline 71
; init_devices();
	rcall _init_devices
L7:
	.dbline 75
	.dbline 77
L8:
	.dbline 73
	rjmp L7
X0:
	.dbline -2
L6:
	.dbline 0 ; func end
	ret
	.dbend