用AtmelStudio6.2跑mega16例程（52)串口通信

/*

 * GccApplication15.c

 *

 * Created: 2014-11-12 20:55:37

 *  Author: Administrator

 */ 



#define F_CPU 4000000UL

#include <avr/io.h>

#include<avr/delay.h>

#include <avr/interrupt.h>

#include <stdint.h>



struct  

{

        uint8_t Buf_Aray[100];

        uint8_t Buf_Len;

}Receive_Buffer;



uint8_t Clear_Buffer_Flag = 0;



const uint8_t SEG_CODE[] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x00};

        

char *s = "this is AVR computer!\n",*P;



void Init_USART()

{

   UCSRB = _BV(RXEN)|_BV(TXEN)|_BV(RXCIE);

   UCSRC = _BV(URSEL)|_BV(UCSZ1)|_BV(UCSZ0);

   UBRRL = (F_CPU/9600/16-1)% 256;

   UBRRH = (F_CPU/9600/16-1)/256;

 }



void PutChar(char c)

{

        

        if(c=='\n')PutChar('\r');

        UDR = c;

        while(!(UCSRA & _BV(UDRE)));

}



void Show_Received_Digits()

{

    uint8_t i;

        for(i=0;i<Receive_Buffer.Buf_Len;i++)

        {

                PORTC = SEG_CODE[Receive_Buffer.Buf_Aray[i]];

                _delay_ms(400);

        }        

}





int main(void)

{

    Receive_Buffer.Buf_Len=0;

        DDRB = 0x00;PORTB = 0xFF;

        DDRC = 0xFF;PORTC = 0x00;

        DDRD = 0x02;PORTD = 0xFF;

        MCUCR = 0x08;

        GICR = _BV(INT1);

        Init_USART();

        sei();

        while(1) Show_Received_Digits();

}



ISR(USART_RXC_vect)

{

        uint8_t c= UDR;

        if(c == '\r'||c=='\n')Clear_Buffer_Flag = 1;

        if(c >= '0'&& c<='9')

        {

                

                if(Clear_Buffer_Flag==1)

                {

                        

                        Receive_Buffer.Buf_Len = 0;

                        Clear_Buffer_Flag = 0;

                }

                Receive_Buffer.Buf_Aray[Receive_Buffer.Buf_Len]= c-'0';

                if(Receive_Buffer.Buf_Len<100)Receive_Buffer.Buf_Len++;

        }

}



ISR(INT1_vect)

{

        uint8_t i=0;

        while(s[i]!='\0')PutChar(s[i++]);

}