#include <stdlib.h>
#include <string-avr.h>
#include <stdio.h>
#include <iom128.h>

#define   CR         0x0A
#define   LF         0x0D
#define   NOTHING    0x00

#define   Baud4800   207
#define   Baud9600   103
#define   Baud14400  68
#define   Baud19200  51
#define   Baud28800  34
#define   Baud38400  25
#define   Baud57600  16
#define   Baud115200 8
#define   PORT0      0
#define   PORT1      1

void USART0_Init(unsigned int baud);
void USART1_Init(unsigned int baud);
void put_chr(unsigned char data,int Port);
void delay_ms(unsigned int time_ms);
void put_str(char *str,int LineFeed,int Port);
unsigned char get_chr(int Port);

char temp;
char temp_str[]= {"You have just pressed :"};

int main(void)
{

   USART0_Init(Baud115200);
   USART1_Init(Baud9600);

   delay_ms(20);

   put_str("Serial Test program",LF,PORT0);
   put_str("English Test",LF, PORT0);
   put_str("한글 테스트",LF, PORT0);
   put_str("Init OK",LF,PORT0);
   put_str("Baudrate is 115200BPS",LF,PORT0);

   while(1)
     {
  
     }
}

void put_str(char *str,int LineFeed,int Port)
{
   unsigned int len;
   int i;
   len = strlen(str);
   for(i=0;i<len;i++)
     {
       put_chr(str[i],Port);
     }
   if(LineFeed == LF || LineFeed == CR)
     {
      put_chr(CR,Port);
      put_chr(LF,Port);
     }
}

void USART0_Init(unsigned int baud)
{
  // UBRR0H = (unsigned char)(baud>>8); // UBRR0L = (unsigned char)baud;
  UBRR0H = 0;
  UBRR0L = baud;
  UCSR0B = (1<<RXEN) | (1<<TXEN);
  UCSR0C = (USBS | (3<<UCSZ));
  // 8 data bit. 1 Stop bit, for 2 Stop bit : (1 << USBS) istead of USBS
}

void USART1_Init(unsigned int baud)
{
  //  UBRR1H = (unsigned char)(baud>>8);//  UBRR1L = (unsigned char)baud;
  UBRR1H = 0;
  UBRR1L = baud;
  UCSR1B = (1<<RXEN) | (1<<TXEN);
  UCSR1C = (USBS | (3<<UCSZ));
  // 8 data bit. 1 Stop bit, for 2 Stop bit : (1 << USBS) istead of USBS
}

unsigned char get_chr(int Port)
{
  if(Port == 0)
    {
      while (!(UCSR0A & (1<<RXC)));
      // Also u can use it :->  loop_until_bit_is_set(UCSR0A, RXC);
      return UDR0;
    }
  if(Port == 1)
    {
      while (!(UCSR1A & (1<<RXC)));
      // Also u can use it :->  loop_until_bit_is_set(UCSR1A, RXC);
      return UDR1;
    }
}

void put_chr(unsigned char data,int Port)
{
  if(Port == 0)
   {
     while(!(UCSR0A & (1<<UDRE)));
     UDR0 = data;
   }
  if(Port == 1)
  {
     while(!(UCSR1A & (1<<UDRE)));
     UDR1 = data;
  }
}

void delay_ms(unsigned int time_ms)
{
  int i,j;
  while (time_ms--)
   {
     for(i=0;i<230;i++)
       for(j=0;j<156;j++);
   }
}

IAR 컴파일러로 작성된 소스이며 OK-128회로에서 김대종씨가 작성하신 프로그램을 약간 수정하였습니다.

시리얼 통신 회로 RX, TX를 구성하시고 위 프로그램을 사용하시면 됩니다.

각자 필요에 맞게 고쳐서 쓰시면 되겠습니다.