main.s

一个关于AVR单片机的例程

	.module main.c
	.area lit(rom, con, rel)
_seg7_data::
	.byte 63,6
	.byte 91,'O
	.byte 'f,'m
	.byte 125,7
	.byte 127,'o
	.byte 'w,124
	.byte 57,94
	.byte 'y,'q
	.byte 0
	.dbfile E:\avr\2.1.6\main.c
	.dbsym e seg7_data _seg7_data A[17:17]kc
	.area text(rom, con, rel)
	.dbfile E:\avr\2.1.6\main.c
	.dbfunc e port_init _port_init fV
	.even
_port_init::
	.dbline -1
	.dbline 12
; //ICC-AVR application builder : 2007-5-29 15:21:23
; // Target : M16
; // Crystal: 7.3728Mhz
; 
; #include <iom16v.h>
; #include <macros.h>
; 
; const unsigned char seg7_data[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};//0~F and "shut"
; 
; 
; void port_init(void)
; {
	.dbline 13
;  PORTA = 0xFF;
	ldi R24,255
	out 0x1b,R24
	.dbline 14
;  DDRA  = 0xFF;
	out 0x1a,R24
	.dbline 15
;  PORTB = 0x01; //PB0，是TIMER0的外部时钟输入脚（T0），需要设为输入，并且使能内部上拉
	ldi R24,1
	out 0x18,R24
	.dbline 16
;  DDRB  = 0x00;
	clr R2
	out 0x17,R2
	.dbline 17
;  PORTC = 0x00; //m103 output only
	out 0x15,R2
	.dbline 18
;  DDRC  = 0x00;
	out 0x14,R2
	.dbline 19
;  PORTD = 0x00;
	out 0x12,R2
	.dbline 20
;  DDRD  = 0x00;
	out 0x11,R2
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e timer0_init _timer0_init fV
	.even
_timer0_init::
	.dbline -1
	.dbline 28
; }
; 
; //TIMER0 initialize - prescale:Falling edge
; // WGM: Normal
; // desired value: 1KHz
; // actual value: Out of range
; void timer0_init(void)
; {
	.dbline 29
;  TCCR0 = 0x00; //stop
	clr R2
	out 0x33,R2
	.dbline 30
;  TCNT0 = 0x00; //set count
	out 0x32,R2
	.dbline 31
;  OCR0  = 0x0A;  //set compare十进制的十，十次按键后匹配，进入这里
	ldi R24,10
	out 0x3c,R24
	.dbline 32
;  TCCR0 = 0x06; //start timer
	ldi R24,6
	out 0x33,R24
	.dbline -2
L2:
	.dbline 0 ; func end
	ret
	.dbend
	.area vector(rom, abs)
	.org 76
	jmp _timer0_comp_isr
	.area text(rom, con, rel)
	.dbfile E:\avr\2.1.6\main.c
	.dbfunc e timer0_comp_isr _timer0_comp_isr fV
	.even
_timer0_comp_isr::
	st -y,R2
	in R2,0x3f
	st -y,R2
	.dbline -1
	.dbline 37
; }
; 
; #pragma interrupt_handler timer0_comp_isr:20
; void timer0_comp_isr(void)
; {
	.dbline 40
;  //compare occured TCNT0=OCR0
;  //按下键OCR0次后，会进入本中断
;  TCNT0 = 0x00;
	clr R2
	out 0x32,R2
	.dbline -2
L3:
	ld R2,y+
	out 0x3f,R2
	ld R2,y+
	.dbline 0 ; func end
	reti
	.dbend
	.dbfunc e init_devices _init_devices fV
	.even
_init_devices::
	.dbline -1
	.dbline 45
; }
; 
; //call this routine to initialize all peripherals
; void init_devices(void)
; {
	.dbline 47
;  //stop errant interrupts until set up
;  CLI(); //disable all interrupts
	cli
	.dbline 48
;  port_init();
	xcall _port_init
	.dbline 49
;  timer0_init();
	xcall _timer0_init
	.dbline 51
; 
;  MCUCR = 0x00;
	clr R2
	out 0x35,R2
	.dbline 52
;  GICR  = 0x00;
	out 0x3b,R2
	.dbline 53
;  TIMSK = 0x02; //timer interrupt sources
	ldi R24,2
	out 0x39,R24
	.dbline 54
;  SEI(); //re-enable interrupts
	sei
	.dbline -2
L4:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e main _main fV
	.even
_main::
	.dbline -1
	.dbline 59
;  //all peripherals are now initialized
; }
; 
; void main(void)
; {
	.dbline 60
;  init_devices();
	xcall _init_devices
	xjmp L7
L6:
	.dbline 62
	.dbline 63
	ldi R24,<_seg7_data
	ldi R25,>_seg7_data
	in R30,0x32
	clr R31
	add R30,R24
	adc R31,R25
	lpm R30,Z
	out 0x1b,R30
	.dbline 64
L7:
	.dbline 61
	xjmp L6
X0:
	.dbline -2
L5:
	.dbline 0 ; func end
	ret
	.dbend