main.s

一个关于AVR单片机的例程

	.module main.c
	.area data(ram, con, rel)
_tmp::
	.blkb 1
	.area idata
	.byte 0
	.area data(ram, con, rel)
	.dbfile E:\avr\2.5.2\main.c
	.dbsym e tmp _tmp c
	.area text(rom, con, rel)
	.dbfile E:\avr\2.5.2\main.c
	.dbfunc e port_init _port_init fV
	.even
_port_init::
	.dbline -1
	.dbline 11
; //ICC-AVR application builder : 2007-5-30 15:23:23
; // Target : M16
; // Crystal: 7.3728Mhz
; 
; #include <iom16v.h>
; #include <macros.h>
; 
; volatile unsigned char tmp=0;
; 
; void port_init(void)
; {
	.dbline 12
;  PORTA = 0x00;
	clr R2
	out 0x1b,R2
	.dbline 13
;  DDRA  = 0x00;
	out 0x1a,R2
	.dbline 14
;  PORTB = 0x00;
	out 0x18,R2
	.dbline 15
;  DDRB  = 0x00;
	out 0x17,R2
	.dbline 16
;  PORTC = 0x00; //m103 output only
	out 0x15,R2
	.dbline 17
;  DDRC  = 0x00;
	out 0x14,R2
	.dbline 18
;  PORTD = 0x00;
	out 0x12,R2
	.dbline 19
;  DDRD  = 0x00;
	out 0x11,R2
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e uart0_init _uart0_init fV
	.even
_uart0_init::
	.dbline -1
	.dbline 28
; }
; 
; //UART0 initialize
; // desired baud rate: 9600
; // actual: baud rate:9600 (0.0%)
; // char size: 8 bit
; // parity: Disabled
; void uart0_init(void)
; {
	.dbline 29
;  UCSRB = 0x00; //disable while setting baud rate
	clr R2
	out 0xa,R2
	.dbline 30
;  UCSRA = 0x00;
	out 0xb,R2
	.dbline 31
;  UCSRC = BIT(URSEL) | 0x06;
	ldi R24,134
	out 0x20,R24
	.dbline 32
;  UBRRL = 0x2F; //set baud rate lo
	ldi R24,47
	out 0x9,R24
	.dbline 33
;  UBRRH = 0x00; //set baud rate hi
	out 0x20,R2
	.dbline 34
;  UCSRB = (1<<RXCIE)|(1<<TXCIE)|(1<<RXEN)|(1<<TXEN);
	ldi R24,216
	out 0xa,R24
	.dbline -2
L2:
	.dbline 0 ; func end
	ret
	.dbend
	.area vector(rom, abs)
	.org 44
	jmp _uart0_rx_isr
	.area text(rom, con, rel)
	.dbfile E:\avr\2.5.2\main.c
	.dbfunc e uart0_rx_isr _uart0_rx_isr fV
	.even
_uart0_rx_isr::
	st -y,R2
	in R2,0x3f
	st -y,R2
	.dbline -1
	.dbline 39
; }
; 
; #pragma interrupt_handler uart0_rx_isr:12
; void uart0_rx_isr(void)
; {
	.dbline 41
;  //uart has received a character in UDR
;  tmp=UDR; //读取接收到的数
	in R2,0xc
	sts _tmp,R2
	.dbline 42
;  UDR=tmp; //启动发送
	lds R2,_tmp
	out 0xc,R2
	.dbline -2
L3:
	ld R2,y+
	out 0x3f,R2
	ld R2,y+
	.dbline 0 ; func end
	reti
	.dbend
	.area vector(rom, abs)
	.org 52
	jmp _uart0_tx_isr
	.area text(rom, con, rel)
	.dbfile E:\avr\2.5.2\main.c
	.dbfunc e uart0_tx_isr _uart0_tx_isr fV
	.even
_uart0_tx_isr::
	st -y,R2
	in R2,0x3f
	st -y,R2
	.dbline -1
	.dbline 56
; }
; 
; /*
; #pragma interrupt_handler uart0_udre_isr:13
; void uart0_udre_isr(void)
; {
;  //character transferred to shift register so UDR is now empty
;  UDR='x'; //是空就让，传输完成接着就会进入本中断。
; }
; */
; 
; #pragma interrupt_handler uart0_tx_isr:14
; void uart0_tx_isr(void)
; {
	.dbline 58
;  //character has been transmitted
;  UDR=tmp;
	lds R2,_tmp
	out 0xc,R2
	.dbline -2
L4:
	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 63
; }
; 
; //call this routine to initialize all peripherals
; void init_devices(void)
; {
	.dbline 65
;  //stop errant interrupts until set up
;  CLI(); //disable all interrupts
	cli
	.dbline 66
;  port_init();
	xcall _port_init
	.dbline 67
;  uart0_init();
	xcall _uart0_init
	.dbline 69
; 
;  MCUCR = 0x00;
	clr R2
	out 0x35,R2
	.dbline 70
;  GICR  = 0x00;
	out 0x3b,R2
	.dbline 71
;  TIMSK = 0x00; //timer interrupt sources
	out 0x39,R2
	.dbline 72
;  SEI(); //re-enable interrupts
	sei
	.dbline -2
L5:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e main _main fV
	.even
_main::
	.dbline -1
	.dbline 77
;  //all peripherals are now initialized
; }
; 
; void main(void)
; {
	.dbline 78
;  init_devices();  //主程序里面只初始化
	xcall _init_devices
	.dbline 79
;  UDR=tmp;
	lds R2,_tmp
	out 0xc,R2
L7:
	.dbline 81
L8:
	.dbline 80
	xjmp L7
X0:
	.dbline -2
L6:
	.dbline 0 ; func end
	ret
	.dbend