uart.s

ATEMEL AVR128 BOOT程序

	.module uart.c
	.area text(rom, con, rel)
	.dbfile E:\ICCAVR\project\AVRMEG~3\icc\019-BOOT\uart.c
	.dbfunc e uart0_init _uart0_init fV
	.even
_uart0_init::
	.dbline -1
	.dbline 4
; #include "init.h"
; 
; /*串口初始化函数*/
; void uart0_init(void) {
	.dbline 6
; 
; 	UCSR0A = 0x00;
	clr R2
	out 0xb,R2
	.dbline 7
; 	UCSR0B = (1 << TXEN0) | (1 << RXEN0);		/*允许接收和发送*/
	ldi R24,24
	out 0xa,R24
	.dbline 8
; 	UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);		/*8位数据、1 位停止、异步、无校验*/
	ldi R24,6
	sts 149,R24
	.dbline 9
; 	UBRR0H = 0;
	sts 144,R2
	.dbline 10
; 	UBRR0L = 1;									/*波特率115200*/
	ldi R24,1
	out 0x9,R24
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e putChar _putChar fV
;              i -> R16
	.even
_putChar::
	.dbline -1
	.dbline 14
; }
; 
; /*数据发送，查询方式*/
; void putChar(unsigned char i) {
L3:
	.dbline 16
L4:
	.dbline 16
; 
; 	while (!(UCSR0A & (1<<UDRE0)));				/* 等待发送缓冲器为空*/
	sbis 0xb,5
	rjmp L3
	.dbline 17
; 	UDR0 = i;									/* 发送数据*/
	out 0xc,R16
	.dbline -2
L2:
	.dbline 0 ; func end
	ret
	.dbsym r i 16 c
	.dbend
	.dbfunc e getChar _getChar fc
	.even
_getChar::
	.dbline -1
	.dbline 21
; }
; 
; /*数据接收，等待查询方式*/
; unsigned char getChar(void) {
	xjmp L8
L7:
	.dbline 23
; 
; 	while (!(UCSR0A & (1<<RXC0))) {				/* 等待接收数据*/
	.dbline 24
; 		if (TCNT1 > 3000) {						/*以下6行代码为指示灯显示*/
	ldi R24,3000
	ldi R25,11
	in R2,0x2c
	in R3,0x2d
	cp R24,R2
	cpc R25,R3
	brsh L10
	.dbline 24
	.dbline 25
; 			TCNT1 = 0x00;
	clr R2
	clr R3
	out 0x2d,R3
	out 0x2c,R2
	.dbline 26
; 			PORTB ^= (1 << PB7);
	ldi R24,128
	ldi R25,0
	in R2,0x18
	clr R3
	eor R2,R24
	eor R3,R25
	out 0x18,R2
	.dbline 27
; 			}
L10:
	.dbline 28
L8:
	.dbline 23
	sbis 0xb,7
	rjmp L7
	.dbline 29
; 		}
; 	PORTB ^= (1 << PB7);
	ldi R24,128
	ldi R25,0
	in R2,0x18
	clr R3
	eor R2,R24
	eor R3,R25
	out 0x18,R2
	.dbline 30
; 	return UDR0;								/* 获取并返回数据*/
	in R16,0xc
	.dbline -2
L6:
	.dbline 0 ; func end
	ret
	.dbend