sel.c

AVR单片机的串口通信程序,GCC环境下编译的

#include<avr/io.h>
#include<avr/interrupt.h>

void usart_init(void)
{
	//设置波特率
	UBRRL=51;	//9600bps,8M
	UCSRB= _BV(RXEN) | _BV(TXEN) | _BV(RXCIE);		//发送使能
	
	UCSRC= _BV(URSEL) | _BV(UCSZ1) | _BV(UCSZ0);//8位数据
	
	sei();//开中断
}

main()
{
	unsigned char i;
	unsigned int j;
	usart_init();
	while(1)
	{		
		//UDR=i;
		//while(!(UCSRA & _BV(TXC)));//等待发送完
		//UCSRA |= _BV(TXC);
		for(j=0;j<10000;j++);
		i++;
	}
}
SIGNAL(SIG_USART_RECV)	//串口接收中断
{
	unsigned char tmp=0x34;
	unsigned char i;
	unsigned char tbl[10];
	//while(UCSRA & _BV(RXC));
	//UCSRA |= _BV(RXC);
	
	tbl[0]=UDR;
	for(i=1;i<10;i++)	
	{
		while(!(UCSRA & _BV(RXC)));//接收完毕
		tbl[i]=UDR;		
	}	
	
	for(i=0;i<10;i++)	
	{
		UDR=tbl[i];
		while(!(UCSRA & _BV(TXC)));//等待发送完
		UCSRA |= _BV(TXC);
	}	
}