485通讯误码率高

//UART1 initialize

// desired baud rate:9600

// actual baud rate:9615 (0.2%)

// char size: 8 bit

// parity: Disabled

void uart1_init(void)

{

 UCSR1B = 0x00; //disable while setting baud rate

 UCSR1A = 0x00;

 UCSR1C = 0x06;

 UBRR1L = 0x33; //set baud rate lo

 UBRR1H = 0x00; //set baud rate hi

 UCSR1B = 0x98;

 Rx_485_on;

}



#pragma interrupt_handler uart1_rx_isr:31

void uart1_rx_isr(void)

{

 //uart has received a character in UDR

 Usart1_RX_Buff = UDR1 ;

 if (Usart1_RX_Buff=='1')

 {

	Usart0_num = (Usart0_num + 1)%2;

	if(Usart0_num==1)

	{

	    Led_on;

	}

	else

	{

	 	Led_off;

	}

 }

}



void USART1_Transmit(uchar data)

{

 	//UCSR1B = 0x90;

 	Tx_485_on;

	delay(20);

	//UCSR1B = 0x98;

  //等待数据寄存器为空

    while ( !( UCSR1A & (1<<UDRE1))) 

  	; 

  //数据放入缓存器                     

    UDR1 = data;

	//UCSR1B = 0x88;

	Rx_485_on;

	delay(20);

	//UCSR1B = 0x98;

}