usart.s

MEGA16 开发包3

	.module usart.c
	.area text(rom, con, rel)
	.dbfile F:\开发\C程序开发\AVR\usart\usart.c
	.dbfunc e uart_init _uart_init fV
	.even
_uart_init::
	.dbline -1
	.dbline 17
; //Project : USART
; //Writer :youhu
; //ICC-AVR application builder : 2007-4-24 16:45:33
; // Target : M16
; // Crystal: 8.0000Mhz
; // USART initialize
; // desired baud rate: 115200
; // actual: baud rate:111111 (3.7%)
; // char size: 8 bit
; // parity: Disabled
; 
; #include <iom16v.h>
; #include <macros.h>
; unsigned char mes;
; 
; void uart_init(void)
; {
	.dbline 18
;  UCSRB = 0x00;                 
	clr R2
	out 0xa,R2
	.dbline 19
;  UCSRA = 0x03;                 //异步模式，禁止奇偶校验，8位数据帧
	ldi R24,3
	out 0xb,R24
	.dbline 20
;  UCSRC = BIT(URSEL) | 0x06;    
	ldi R24,134
	out 0x20,R24
	.dbline 21
;  UBRRL = 0x08;                 //波特率设置为115200
	ldi R24,8
	out 0x9,R24
	.dbline 22
;  UBRRH = 0x00;             
	out 0x20,R2
	.dbline 23
;  UCSRB = 0xF8;                 //允许串口发送和接收，接收和发送中断使能
	ldi R24,248
	out 0xa,R24
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e USART_Receive _USART_Receive fc
	.even
_USART_Receive::
	.dbline -1
	.dbline 34
; }
; 
; /*
; void USART_Transmit( unsigned char data )
; {
;   while ( !( UCSRA & (1<<UDRE)) );          
;   UDR = data;                                
; }
; */
; unsigned char USART_Receive( void )          //串口从主机接收数据
; {
L3:
	.dbline 36
L4:
	.dbline 36
; 
; while ( !(UCSRA & (1<<RXC)) );                // 等待接收数据
	sbis 0xb,7
	rjmp L3
	.dbline 38
; 
; return UDR;                                   // 从缓冲器中获取并返回数据
	in R16,0xc
	.dbline -2
L2:
	.dbline 0 ; func end
	ret
	.dbend
	.area vector(rom, abs)
	.org 52
	jmp _uart0_tx_isr
	.area text(rom, con, rel)
	.dbfile F:\开发\C程序开发\AVR\usart\usart.c
	.dbfunc e uart0_tx_isr _uart0_tx_isr fV
	.even
_uart0_tx_isr::
	xcall push_lset
	.dbline -1
	.dbline 50
; }
; 
; /*
; #pragma interrupt_handler uart0_rx_isr:12     //接收中断函数
; void uart0_rx_isr(void)
; {
; //wait a task; 
; }
; */
; #pragma interrupt_handler uart0_tx_isr:14     //发送中断函数
; void uart0_tx_isr(void)
; {
	.dbline 51
;   mes = USART_Receive();
	xcall _USART_Receive
	sts _mes,R16
L7:
	.dbline 52
L8:
	.dbline 52
;   while ( !( UCSRA & (1<<UDRE)) );            // 等待发送缓冲器为空 
	sbis 0xb,5
	rjmp L7
	.dbline 53
;   UDR = mes;                                  // 将数据放入缓冲器，发送数据
	lds R2,_mes
	out 0xc,R2
	.dbline -2
L6:
	xcall pop_lset
	.dbline 0 ; func end
	reti
	.dbend
	.dbfunc e init_devices _init_devices fV
	.even
_init_devices::
	.dbline -1
	.dbline 57
; }
; 
; void init_devices(void)    //初始化各中断
; { 
	.dbline 58
;  CLI(); 
	cli
	.dbline 59
;  uart_init();
	xcall _uart_init
	.dbline 60
;  MCUCR = 0x00;
	clr R2
	out 0x35,R2
	.dbline 61
;  GICR  = 0x00;
	out 0x3b,R2
	.dbline 62
;  TIMSK = 0x00; 
	out 0x39,R2
	.dbline 63
;  SEI(); 
	sei
	.dbline -2
L10:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e main _main fV
	.even
_main::
	.dbline -1
	.dbline 68
; }
; 
; 
; void main(void)
; { 
	.dbline 69
;  init_devices();
	xcall _init_devices
	.dbline -2
L11:
	.dbline 0 ; func end
	ret
	.dbend
	.area bss(ram, con, rel)
	.dbfile F:\开发\C程序开发\AVR\usart\usart.c
_mes::
	.blkb 1
	.dbsym e mes _mes c