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\2.2.3\main.c
	.dbsym e seg7_data _seg7_data A[17:17]kc
	.area text(rom, con, rel)
	.dbfile E:\avr\2.2.3\main.c
	.dbfunc e port_init _port_init fV
	.even
_port_init::
	.dbline -1
	.dbline 13
; // ICC-AVR application builder : 2007-5-28 22:03:35
; // Target : M16
; // Crystal: 7.3728Mhz
; // 连接：接好电源和晶振的跳线
; // 7断数码管的ABCD接VCC，a~dp接PA0～PA7
; #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"
; volatile  unsigned char i; //在中断中会变化的变量，加volatile限定词定义
; 
; void port_init(void)
; {
	.dbline 14
;  PORTA = 0x00;
	clr R2
	out 0x1b,R2
	.dbline 15
;  DDRA  = 0xFF;
	ldi R24,255
	out 0x1a,R24
	.dbline 16
;  PORTB = 0x00;
	out 0x18,R2
	.dbline 17
;  DDRB  = 0x00;
	out 0x17,R2
	.dbline 18
;  PORTC = 0x00; //m103 output only
	out 0x15,R2
	.dbline 19
;  DDRC  = 0x00;
	out 0x14,R2
	.dbline 20
;  PORTD = 0x00;
	out 0x12,R2
	.dbline 21
;  DDRD  = 0x00;
	out 0x11,R2
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e timer1_init _timer1_init fV
	.even
_timer1_init::
	.dbline -1
	.dbline 29
; }
; 
; //TIMER1 initialize - prescale:256
; // WGM: 0) Normal, TOP=0xFFFF
; // desired value: 1Sec
; // actual value:  1.000Sec (0.0%)
; void timer1_init(void)
; {
	.dbline 30
;  TCCR1B = 0x00; //stop
	clr R2
	out 0x2e,R2
	.dbline 31
;  TCNT1H = 0x8F; //setup
	ldi R24,143
	out 0x2d,R24
	.dbline 32
;  TCNT1L = 0x81;
	ldi R24,129
	out 0x2c,R24
	.dbline 33
;  OCR1AH = 0x70;
	ldi R24,112
	out 0x2b,R24
	.dbline 34
;  OCR1AL = 0x7F;
	ldi R24,127
	out 0x2a,R24
	.dbline 35
;  OCR1BH = 0x70;
	ldi R24,112
	out 0x29,R24
	.dbline 36
;  OCR1BL = 0x7F;
	ldi R24,127
	out 0x28,R24
	.dbline 37
;  ICR1H  = 0x70;
	ldi R24,112
	out 0x27,R24
	.dbline 38
;  ICR1L  = 0x7F;
	ldi R24,127
	out 0x26,R24
	.dbline 39
;  TCCR1A = 0x00;
	out 0x2f,R2
	.dbline 40
;  TCCR1B = 0x04; //start Timer
	ldi R24,4
	out 0x2e,R24
	.dbline -2
L2:
	.dbline 0 ; func end
	ret
	.dbend
	.area vector(rom, abs)
	.org 32
	jmp _timer1_ovf_isr
	.area text(rom, con, rel)
	.dbfile E:\avr\2.2.3\main.c
	.dbfunc e timer1_ovf_isr _timer1_ovf_isr fV
	.even
_timer1_ovf_isr::
	st -y,R2
	st -y,R24
	st -y,R25
	in R2,0x3f
	st -y,R2
	.dbline -1
	.dbline 45
	.dbline 47
	ldi R24,143
	out 0x2d,R24
	.dbline 48
	ldi R24,129
	out 0x2c,R24
	.dbline 49
	lds R24,_i
	subi R24,255    ; addi 1
	sts _i,R24
	.dbline 50
	lds R24,_i
	cpi R24,10
	brne L4
	.dbline 50
	clr R2
	sts _i,R2
L4:
	.dbline -2
L3:
	ld R2,y+
	out 0x3f,R2
	ld R25,y+
	ld R24,y+
	ld R2,y+
	.dbline 0 ; func end
	reti
	.dbend
	.dbfunc e init_devices _init_devices fV
	.even
_init_devices::
	.dbline -1
	.dbline 55
; }
; 
; #pragma interrupt_handler timer1_ovf_isr:iv_TIMER1_OVF
; void timer1_ovf_isr(void)
; {
;  //TIMER1 has overflowed
;  TCNT1H = 0x8F; //reload counter high value
;  TCNT1L = 0x81; //reload counter low value
;  i++;   //在文件开始的定义，volatile unsigned char i;
;  if(i==10) i=0;
; }
; 
; //call this routine to initialize all peripherals
; void init_devices(void)
; {
	.dbline 57
;  //stop errant interrupts until set up
;  CLI(); //disable all interrupts
	cli
	.dbline 58
;  port_init();
	xcall _port_init
	.dbline 59
;  timer1_init();
	xcall _timer1_init
	.dbline 61
; 
;  MCUCR = 0x00;
	clr R2
	out 0x35,R2
	.dbline 62
;  GICR  = 0x00;
	out 0x3b,R2
	.dbline 63
;  TIMSK = 0x04; //timer interrupt sources ,这里允许了timer1溢出中断。
	ldi R24,4
	out 0x39,R24
	.dbline 64
;  SEI(); //re-enable interrupts
	sei
	.dbline -2
L6:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e main _main fV
	.even
_main::
	.dbline -1
	.dbline 69
;  //all peripherals are now initialized
; }
; 
; void main(void)
; {
	.dbline 70
;  init_devices(); //初始化，包含了定时器的初始化
	xcall _init_devices
	xjmp L9
L8:
	.dbline 72
	.dbline 73
	ldi R24,<_seg7_data
	ldi R25,>_seg7_data
	lds R30,_i
	clr R31
	add R30,R24
	adc R31,R25
	lpm R30,Z
	out 0x1b,R30
	.dbline 74
L9:
	.dbline 71
	xjmp L8
X0:
	.dbline -2
L7:
	.dbline 0 ; func end
	ret
	.dbend
	.area bss(ram, con, rel)
	.dbfile E:\avr\2.2.3\main.c
_i::
	.blkb 1
	.dbsym e i _i c