/*
查询方式UART 测试程序
文件名：main.c
硬 件：mega88
时 钟：内部8mhz
芯艺 2004-12-01
*/
#include <avr/io.h>
#include <avr/delay.h>
#ifndef F_CPU
#define F_CPU 8000000UL        //晶振频率  Hz 
#endif
#define UART_UBRR_CALC(BAUD_,FREQ_) ((FREQ_)/((BAUD_)*16L)-1)
#define UART_BAUD_RATE 9600

#define  BufferSize  8
unsigned char TXBuffer[BufferSize]; 
unsigned int  RXBuffer[BufferSize];
unsigned int  DATA_STATUS
//发送一个字符
void put_char(unsigned char c)
{
	UDR0=c;
	while( !(UCSR0A & (1<<UDRE0)) );
	
}


//发送字符串
void put_str(unsigned char *Str)
{
    while(*Str != '\0')
    {
        put_char(*Str);
        Str++;
    }
}

unsigned char get_char(void)
{
	while( !(UCSR0A & (1<<RXC0)) );
	return UDR0;
}

//uart 初始化
void USART_Init(void )
{
   	// 设置波特率
    UBRR0H = (uint8_t)( UART_UBRR_CALC( UART_BAUD_RATE, F_CPU ) >> 8 );
    UBRR0L = (uint8_t)UART_UBRR_CALC( UART_BAUD_RATE, F_CPU );
	UCSR0B=(1<<RXEN0)|(1<<TXEN0);
	UCSR0C|= (1<<UCSZ01)|(1<<UCSZ00); //8位数据位+1位停止位
}

int main(void)
{
	unsigned int i=0,j;
	USART_Init();
	while(1)
	{
		RXBuffer[i]=get_char();
		TXBuffer[i]=RXBuffer[i];
		i++;
		if(i==BufferSize)
		{
			_delay_ms(10);
			for(j=0;j<BufferSize;j++)
			put_char(TXBuffer[j]);
			i=0;
		}
		
	}
}