{ 
             requesttype_temp=ep0_data.device_request.bmRequestType>>5&0x03;
              switch(requesttype_temp)
              { 
                  case(0): //setup standard request 
                  { 
                      switch(ep0_data.device_request.bRequest)
                      { 
                          case(DEF_USB_GET_STATUS):
                         case(DEF_USB_CLR_FEATURE):
                          { 
                              if(ep0_data.device_request.bmRequestType&0x1f==0x02)
                              { 
                                  switch(ep0_data.data_buf[4])
                                  { 
                                      case(0x82):
                                      case(0x02):
                                      case(0x81):
                                      case(0x01):
                                      default:
                                  }
                               }
                               else{CH37x_set_endp3(0x0f);}//return stall
                                break;
                            }
                            case(DEF_USB_SET_FEATURE):
                            case(DEF_USB_SET_ADDRESS): //////////////LED
                           case(DEF_USB_GET_DESCR):   ///////////////LED
                            { 
                              switch(desc_info.desc_type)
                                { 
                                    case(1):{p_desc_type=device_descriptor;break;}
                                    case(2):{p_desc_type=config_descriptor;break;}//config interface class endpoint desc
                                    case(3):
                                    case(4):{p_desc_type=interface_descriptor;break;}
                                    case(5):{p_desc_type=endpoint_descriptor;break;}
                                    case(0x21):{p_desc_type=hid_descriptor;break;}//hid descriptor
                                    case(0x22):{p_desc_type=report_descriptor;desc_info.desc_length=0x32;flag_report_input=1;break;}//report descriptor
                                    // case(0x23):{p_desc_type=physical_descriptor;break;}//physical descriptor
                                    
                                }
                                CH37x_return_desc();
                                break;
                            }
                            case(DEF_USB_SET_DESCR):
                           case(DEF_USB_GET_CONFIG):
                           case(DEF_USB_SET_CONFIG):
                       case(DEF_USB_GET_INTERF):
                       case(DEF_USB_SET_INTERF):
                       case(DEF_USB_SYNC_FRAME):
                     }
                        case(1): //setup class request
                       case(2):CH37x_set_endp3(0x0f);break; //setup vendor request
                        case(3):CH37x_set_endp3(0x0f);break; //reserved request
                        default:{CH37x_set_endp3(0x0f);break;}//return stall
                        }
                                      }