// MCU BASIC: https://www.basic4mcu.com
// DateTime : 2018-12-09 오전 1:45:08
// by Ok-Hyun Park
//
#include <mega128.h>
#include <stdlib.h>
//------------------------------------------------------------------
char bcd_table[90]={0xA0,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x80,0x90}; //0,1,2,3,4,5,6,7,8,9,10
//==================================================================
//롯또번호 발생 주 프로그램.
//------------------------------------------------------------------
interrupt[TIM1_COMPA]void timer1_compa_isr(void){ //10ms
  static bit  start_flag=0,reset_flag=0,up_flag=0,down_flag=0;
  static char run=0,data[12],data_rand[6],count=0;
  static int  ms10=0,seed=0;
  char i,j,k;
  //----------------------------------------
  seed++; //난수의 씨앗
  //----------------------------------------
  if(!PINF.7){ // start key 누르면
    if(start_flag==0){ start_flag=1; srand(seed); run=1; ms10=0; }
  }
  else{ start_flag=0; }
  //----------------------------------------
  if(run==1){               // led를 무작위로 10초동안 깜박임.
    PORTC=0x10<<(rand()%4);
    if(++ms10>999){ ms10=0; // 10초 후
      // 롯또 번호 추출.
      for(i=0; i<6; i++)data_rand[i]=45; // data 초기화
      for(i=0; i<6; i++){
here:
        j=rand()%45;
        for(k=0; k<6; k++){ if(data_rand[k]==j)goto here; } // 중복검사
        data_rand[i]=j;
      }
      for(i=0; i<6; i++){ data_rand[i]++; }     // 0~44->1~45로 변환
      for(i=0; i<6; i++){                       // 표시할 data로 전환.
        data[i*2  ]=bcd_table[data_rand[i]/10]; // 십의자리
        data[i*2+1]=bcd_table[data_rand[i]%10]; // 일의자리
      }
      count=0;
      run=2;
    }
  }
  //----------------------------------------
  if(run==2){    // 롯또 번호 표시.
    //----------------------------------------
    if(!PINF.6){ // reset key 누르면
      if(reset_flag==0){ reset_flag=1; run=0; }
    }
    else{ reset_flag=0; }
    //----------------------------------------
    if(!PINF.5){ // up key 누르면
      if(up_flag==0){ up_flag=1; if(count<11)count++; } //다음 data
    }
    else{ up_flag=0; }
    //----------------------------------------
    if(!PINF.4){ // down key 누르면
      if(down_flag==0){ down_flag=1; if(count>0)count--; } //이전 data
    }
    else{ down_flag=0; }
    //----------------------------------------
    PORTC=data[count];
  }
}
//=======================================================================
void main(void){
  DDRC=0xF0;  // PC7-PC4=LED output
  PORTF=0xFF; // PORTF=KEY input
  TCCR1B=0x0C; OCR1A=624; TIMSK=0x10; //10ms
  SREG=0x80;
  while(1);
}