unsigned char encode_cl;
unsigned char encode_co;
                 

void encode_rheostat(unsigned char pos,unsigned char minus){
                         unsigned char temp_data=0x03;
                         unsigned char temp_data1;
                         unsigned char cl_data;
                         unsigned char co_data;
                         cl_data=pos;
                         co_data=minus;
                         temp_data1=co_data+(cl_data<<1);
                         switch(temp_data){
                             case 0x03:{
                                       if(temp_data1==0x01){
                                             encode_cl++;
                                             encode_co--;
                                             }
                                        else if(temp_data1==0x02){
                                             encode_cl--;
                                             encode_co++;
                                             }
                                            break;
                                       }
                             case 0x01:{
                                       if(temp_data1==0x02){
                                            if(encode_cl==1){
                                                   encode_cl++;
                                                   encode_co--;
                                                   }
                                            else if(encode_co==2){
                                                encode_cl--;
                                                encode_co++;
                                                }
                                               }
                                             break;          
                                       }
                             case 0x02:{
                                        if(temp_data1==0x01){
                                            if(encode_cl==2){
                                                   encode_cl++;
                                                   encode_co--;
                                                   }
                                             else if(encode_co==1){
                                                   encode_cl--;
                                                   encode_co++;
                                                   }
                                                }
                                               break;
                                        }
                             default:{
                                 break;
                                   }
                                 }
                             temp_data=temp_data1;
                               }