//
// usart 에 1,2 입력시 led 좌,우측 순차점등이고 
// atmega128 array Fnd 가 좌,우측 나뉘어서 1,2 입력 한 숫자만큼 증가
//
#include <avr/io.h>
#include <avr/interrupt.h>
#include "1.h"
#define  CPU_CLOCK  7372800UL
#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
//
volatile unsigned char FND[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x27,0x7F,0x6F};
volatile unsigned char digit=0,display_num[4]={0.0.0.0}
volatile unsigned int tic_time=0;
//
char U0_rxChar(){ while(!(UCSR0A&0x80)); return UDR0; }
void U0_txChar(char d){ while(!(UCSR0A&(1<<UDRE0))); UDR0=d; }
void U0_txStr(char *s){ while(*s)U0_txChar(*s++); }
//
void delay(unsigned int dsec){ tic_time=0; while(dsec>tic_time); }
//
ISR(TIMER0_COMP_vect){ // 998.2638888888889us
  tic_time++;
  PORTA=FND[display_num[digit]]; PORTG=~(1>>digit);
  if(++digit>3)digit=0;
}
//
int main(void){
  int i,count,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):";
  DDRA=0xFF;   DDRC=0xFF; DDRG=0xFF; PORTG=0xFF;
  UCSR0B=0x18; UBRR0L=23;
  TCCR0=0x0C;  OCR0=114; TIMSK=2; //7372800Hz/64/(1+114)=1001.739130434783Hz,998.2638888888889us
  sei(); 
  for(;;){
    U0_txStr(buf1); U0_txStr(buf2); U0_txStr(buf3);
    byte=U0_rxChar(); U0_txChar(byte); U0_txStr("\r\n");
    if(byte=='1'){
      if(++count>99)count=0;
      display_num[0]=count/10;
      display_num[1]=count%10;
      for(i=0;i<8;i++){ PORTC=0x01<<i; delay(125); } PORTC=0;
    }
    if(byte=='2'){ 
      if(++count1>99)count1=0;
      display_num[2]=count1/10;
      display_num[3]=count1%10;
      for(i=0;i<8;i++){ PORTC=0x80>>i; delay(125); } PORTC=0;
    }
  }  
  return 0;
}