/****************************************************
**晶振：內(nèi)部7.3728MHz
**實(shí)現(xiàn)功能：將從PC機(jī)接受的字符返回PC機(jī)
**設(shè)置：波特率9600, 8 bit, 1 stop bit, 無(wú)校驗(yàn)
****************************************************/
#include <iom128.h>
#include <macros.h>

#define uchar unsigned char 
#define uint  unsigned int

void UART_init(void)
{
	UCSR0A = 0x00;		/*倍速					*/
	UCSR0B = 0x18;		/*允許接收和發(fā)送*/
	UCSR0C = 0x0E;		/*8位數(shù)據(jù)，1位停止位，無(wú)校驗(yàn)位				*/
	UBRR0H = 0x00;
	UBRR0L = 0x47;		/*9600					*/
}

uchar UART_recive(void)
{
    while (!(UCSR0A&(1<<RXC0))); /* 等待接收數(shù)據(jù)*/
    return UDR0;                 /* 獲取并返回?cái)?shù)據(jù)*/
}

void UART_transmit(uchar data)
{
    while(!(UCSR0A&(1<<UDRE0)));
    UDR0=data;
}

void main(void)
{
    uchar j;
    CLI();
    WDR();
    UART_init();
    SEI();
    while(1)
      {
      j=UART_recive(); 
      UART_transmit(j);
      }
}