asm(".include hardware.inc");
extern int Sec;
extern int Min;
extern int Hour;
extern int day;
extern int month;
extern int year;
extern int i3;
extern int stoptag;
extern int keycode;
 
 void key_change(void){
       i3=0;
      switch (keycode){
      case 1: {if(stoptag==0){asm("[P_INT_Ctrl]=%0"::"r"(0x0080));
                             stoptag=1;keycode=0;
                             break;}
              else{asm("[P_INT_Ctrl]=%0"::"r"(0x0084));
                   stoptag=0;keycode=0;
                   break;}
               }
      case 2:{if(Sec==60)Sec=0;
              else Sec++;
              break;}
      case 3:{if(Sec==0)Sec=0;
              else Sec--;
                 break;}
      case 4:{if(Min==60)Min=0;
             else Min++;
             break;}
      case 5:{if(Min==0)Min=0;
               else Min--;
                 break;}
      case 6:{if(Hour==23)Hour=0;
              else Hour++;
                break;}
      case 7:{if(Hour==0)Hour=0;
               else Hour--;
                break;}
      case 9:{if((year-2000)%4==0)
                 {if(month==2&&day==29){day=1,month=3;break;}}
              else if(month==2&&day==28){day=1,month=3;break;}  
                if(month==12&&day==31){month=1,day=1,year++;break;}
                else if(day==31&&(month==1||month==3||month==5||month==7||month==8||month==10)){day=1,++month;break;}
                      else if(day==30&&month!=12){day=1,++month;break;}
                           else ++day; 
              break;}          
      case 10:{if(day==1){if((year-2000)%4==0)
                           {if(month==3){day=29;month=2;break;}}
                         else if(month==3){day=28;month=2;break;}
                            if(month==1){year--,month=12,day=31;break;}
                            else if(month==5||month==7||month==8||month==10||month==12){month--,day=30;break;}
                                 else{ --month,day=31;break;}
                         }
                else --day;
                break;                 
               }                                 
      case 11:{if(month==12)month=1,year++;
                else ++month;
                break;
               } 
      case 12:{if(month==1)month=12,year--;
                else --month;
                break;}
      case 13:++year;break;
      case 14:--year;break;
      default: break;}
      asm("[P_Watchdog_Clear]=%0"::"r"(0x0001)); 
      keycode=0;
      return;                        
}