- u -

• uart : AP_Beacon_Marvelmind , AP_Beacon_Pozyx , AP_Proximity_LightWareSF40C , AP_Proximity_TeraRangerTower , AP_RangeFinder_Benewake , AP_RangeFinder_LeddarOne , AP_RangeFinder_LightWareSerial , AP_RangeFinder_MaxsonarSerialLV , AP_RangeFinder_NMEA , AP_RangeFinder_uLanding , AP_RangeFinder_Wasp , AP_SerialManager
• uart_drivers : ChibiOS::UARTDriver
• uart_thread_ctx : ChibiOS::UARTDriver
• uartA : AP_HAL::HAL
• uartB : AP_HAL::HAL
• uartC : AP_HAL::HAL
• uartD : AP_HAL::HAL
• uartE : AP_HAL::HAL
• uartF : AP_HAL::HAL
• uarts : HAL_F4Light
• uartSDriver : F4Light::DSM_parser , F4Light::SBUS_parser
• uavcan_hardpoint_id : AP_Gripper::Backend_Config
• uavcan_number : PX4::PX4Scheduler::_uavcan_thread_arg , VRBRAIN::VRBRAINScheduler::_uavcan_thread_arg
• ublox_detect_state : AP_GPS::detect_state
• ulpi_auto_res : _USB_OTG_GUSBCFG_TypeDef
• ulpi_clk_sus_m : _USB_OTG_GUSBCFG_TypeDef
• ulpi_ext_vbus_drv : _USB_OTG_GUSBCFG_TypeDef
• ulpi_fsls : _USB_OTG_GUSBCFG_TypeDef
• ulpi_ind_cpl : _USB_OTG_GUSBCFG_TypeDef
• ulpi_int_vbus_ind : _USB_OTG_GUSBCFG_TypeDef
• ulpi_passthrough : _USB_OTG_GUSBCFG_TypeDef
• ulpi_protect_disable : _USB_OTG_GUSBCFG_TypeDef
• unbuffered_writes : ChibiOS::UARTDriver
• underspeed : AP_TECS::flags
• undulation : AP_GPS_NOVA::bestpos
• Undulation : AP_GPS_SBF::msg4007 , log_GPS_SBF_EVENT
• unit : log_Unit , UnitStructure
• units : DataFlash_Class::log_write_fmt , log_Format_Units , LogStructure
• unitsAreSI : NavEKF2_core::ext_nav_elements
• unselected_mask : SITL::XPlane
• unused1 : AP_Proximity_LightWareSF40C , Location_Option_Flags
• unused2 : AP_Proximity_LightWareSF40C
• update : TimerState
• update_event_ : PX4::PX4CAN , PX4::PX4CANManager , VRBRAIN::VRBRAINCAN , VRBRAIN::VRBRAINCANManager
• update_flight_stage_fn : AP_Landing
• update_rate_hz : SITL::SITL
• updated : AP_Baro , AP_Beacon_Marvelmind::StationaryBeaconsPositions
• upper_joint_limits : SITL::Gimbal
• UpTime : AP_GPS_SBF::msg4014
• uptime : AP_GPS_UBLOX::ubx_nav_status
• URB_State : _HCD
• usage : AP_GPS_UBLOX::ubx_cfg_sbas
• USARTx : usart_dev
• usbactep : _USB_OTG_DEPCTL_TypeDef
• usbreset : _USB_OTG_GINTMSK_TypeDef , _USB_OTG_GINTSTS_TypeDef
• usbsuspend : _USB_OTG_GINTMSK_TypeDef , _USB_OTG_GINTSTS_TypeDef
• usbtrdtim : _USB_OTG_GUSBCFG_TypeDef
• use : AP_Airspeed , log_AIRSPEED
• use_desvel_ff_z : AC_PosControl::poscontrol_flags
• use_for_yaw : Compass::mag_state
• use_model : AP_Mount_Alexmos::alexmos_params
• use_present_pin : usb_attr_t
• use_smoothing : SITL::Aircraft
• use_stab_col : AC_InputManager_Heli::InputManagerHeliFlags
• use_time_sync : SITL::Aircraft
• use_zero_offset : AP_Airspeed::airspeed_state
• used : log_GPS
• usedMask : AP_GPS_UBLOX::ubx_mon_hw_60 , AP_GPS_UBLOX::ubx_mon_hw_68
• useGpsVertVel : NavEKF2_core , NavEKF3_core
• user_flag1 : AP_Proximity_LightWareSF40C
• user_flag2 : AP_Proximity_LightWareSF40C
• user_mode_change : AP_Notify::notify_events_type
• user_mode_change_failed : AP_Notify::notify_events_type
• using_gps : nav_filter_status
• usingMinHypothesis : NavEKF3_core
• usingWheelSensors : NavEKF3_core
• usr_cb : _DCD
• usr_device : _DCD
• utc_adjustment : AP_UAVCAN::SystemClock
• utc_date : AP_GPS_MTK19::diyd_mtk_msg
• utc_time : AP_GPS_MTK19::diyd_mtk_msg , AP_GPS_MTK::diyd_mtk_msg
• utc_usec : PX4::CanRxItem , VRBRAIN::CanRxItem
• util : AP_HAL::HAL