어렵기도 하고 도움받을만한 사람이 없어서 적어봅니다 (바쁘거나 귀찮으시면 패스하셔도됩니다.)
목표는 usart 에 1,2 입력시 led 좌,우측 순차점등이고 atmega128 array Fnd 가 좌,우측 나뉘어서 1,2 입력 한 숫자만큼 증가입니다.
avr studio 4 기준입니다.
헤더파일
(
#include <avr/io.h>
#include <avr/interrupt.h>
 
#define		CPU_CLOCK 7372800
volatile unsigned int tic_time;
unsigned char display_num[4] = {0.0.0.0}
unsigned char FND[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x27,0x7F,0x6F};
unsigned int digit =0;
 
#define BAUD_RATE  19200
#define BAUD_RATE_L (CPU_CLOCK/(161*BAUD_RATE))-1
#define BAUD_RATE_H ((CPU_CLOCK/(161*BAUD_RATE))-1)>>8
 
void usart_send_byte(unsigned char byte)
{
	while (!(UCSR0A&(1<<UDRE0)));
	UDR0 = byte;
}
void usart_send_string(unsigned char *str,unsigned char len)
{
	int i;
	for (i=0;i<len;i++)
	{
		usart_send_byte(*(str+i));
	}
}
unsigned char usart_recv_byte(void)
{
	while(!(UCSR0A & (1<<RXC0)));
	return UDR0;
}
 
ISR(TIMER0_COMP_vect)
{
	tic_time++;
	TCNT0=256-(CPU_CLOCK/256/100/2);
	PORTA = FND[display_num[digit]];
	PORTG = ~(0x01>>digit);
	
	digit++;
	digit = digit % 4;
	
}
void delay(unsigned int dsec)
{
	tic_time =0;
	while(dsec>tic_time);
}
)
 
메인 
 
#include "1.h"
int main(void)
{
	int i;
	int count;
	int count1;
	unsigned char byte;
	unsigned char buf1[]="1.led 좌측부터 순차점등 |r|n";
	unsigned char buf2[]="2.led 우측부터 순차점등 |r|n";
	unsigned char buf3[]="input number(1-2):";
	
	DDRC=0xFF;
	PORTC=0x00 
	
	DDRA=0xFF;
	PORTA=0x00;
	
	DDRG=0xFF;
	PORTG=0xFF;
	
	 UBRR0L=(unsigned char)BAUD_RATE_L;
	 UBRR0H=(unsigned char)BAUD_RATE_H;
	 
	 UCSR0B=(1<<TXEN)|(1<<RXEN)|(0<<UCSZ2);
	 UCSR0C=(0<<UPM1)|(0<<UPM0)|(0<<USBS)|(1<UCSZ1)|(1<<UCSZ0);
	 TCCR0=(0<<WGM00)|(1<<WGM01)|(1<<CS02)|(0<<CS01)|(1<<CS00);
	 TCNT0=256-(CPU_CLOCK/256/100/2);
	 TIMSK=(1<<OCIE0)|(0<<TOIE0);
	 
	 sei();	 
    
for (;;)
{
	usart_send_string(buf1,sizeof(buf1));
	usart_send_string(buf2,sizeof(buf2));
	usart_send_string(buf3,sizeof(buf3));
	byte = usart_recv_byte();
	usart_send_byte(byte);
	if (byte=='1')
	{
		for(i=0;i<9;i++)
		{
			PORTC=(1<<i);
			delay(125);
		}
		count++;
		display_num[0]=((count/10)%10);
		display_num[1]=((count/1)%10);
		PORTC=0x00;
	}
	else if (byte == '2')
	{	
		for (i=7;i>=0;i--)
		{
			PORTC=(1<<i);
			delay(125);
		}
		count1++;
		display_num[2]=((count1/10)%10);
		display_num[3]=((count1/1)%10);
		PORTC=0x00;;
	}
	usart_send_byte('|r');
	usart_send_byte('|n');
}	
return 0;
}