Class nebula::drivers::HesaiDecoder

template <typename SensorT>

ClassList > nebula > drivers > HesaiDecoder

• #include <hesai_decoder.hpp>

Inherits the following classes: nebula::drivers::HesaiScanDecoder

Public Functions

Type	Name
	HesaiDecoder (const std::shared_ptr< const HesaiSensorConfiguration > & sensor_configuration, const std::shared_ptr< const typename SensorT::angle_corrector_t::correction_data_t > & correction_data) Constructor.
virtual std::tuple< drivers::NebulaPointCloudPtr, double >	get_pointcloud () override Returns the point cloud and timestamp of the last scan.
virtual bool	has_scanned () override Indicates whether one full scan is ready.
virtual int	unpack (const std::vector< uint8_t > & packet) override Parses PandarPacket and add its points to the point cloud.

Public Functions inherited from nebula::drivers::HesaiScanDecoder

See nebula::drivers::HesaiScanDecoder

Type	Name
	HesaiScanDecoder (HesaiScanDecoder && c) = delete
	HesaiScanDecoder (const HesaiScanDecoder & c) = delete
	HesaiScanDecoder () = default
virtual std::tuple< drivers::NebulaPointCloudPtr, double >	get_pointcloud () = 0 Returns the point cloud and timestamp of the last scan.
virtual bool	has_scanned () = 0 Indicates whether one full scan is ready.
HesaiScanDecoder &	operator= (HesaiScanDecoder && c) = delete
HesaiScanDecoder &	operator= (const HesaiScanDecoder & c) = delete
virtual int	unpack (const std::vector< uint8_t > & packet) = 0 Parses PandarPacket and add its points to the point cloud.
virtual	~HesaiScanDecoder () = default

Protected Attributes

Type	Name
SensorT::angle_corrector_t	angle_corrector_ Decodes azimuth/elevation angles given calibration/correction data.
std::array< std::array< int, SensorT::packet_t::n_blocks >, SensorT::packet_t::max_returns >	block_firing_offset_ns_ For each return mode, the firing offset of each block relative to its packet in nanoseconds.
std::array< int, SensorT::packet_t::n_channels >	channel_firing_offset_ns_ For each channel, its firing offset relative to the block in nanoseconds.
NebulaPointCloudPtr	decode_pc_ The point cloud new points get added to.
uint64_t	decode_scan_timestamp_ns_ = = 0 The timestamp of the scan currently in progress.
bool	has_scanned_ = = false Whether a full scan has been processed.
uint32_t	last_azimuth_ = = 0
rclcpp::Logger	logger_
NebulaPointCloudPtr	output_pc_ The point cloud that is returned when a scan is complete.
uint64_t	output_scan_timestamp_ns_ = = 0 The timestamp of the last completed scan in nanoseconds.
SensorT::packet_t	packet_ The last decoded packet.
ScanCutAngles	scan_cut_angles_
SensorT	sensor_ = {} The sensor definition, used for return mode and time offset handling.
const std::shared_ptr< const drivers::HesaiSensorConfiguration >	sensor_configuration_ Configuration for this decoder.

Protected Functions

Type	Name
void	convert_returns (size_t start_block_id, size_t n_blocks) Converts a group of returns (i.e. 1 for single return, 2 for dual return, etc.) to points and appends them to the point cloud.
float	get_distance (const typename SensorT::packet_t::body_t::block_t::unit_t & unit) Get the distance of the given unit in meters.
uint32_t	get_point_time_relative (uint64_t scan_timestamp_ns, uint64_t packet_timestamp_ns, size_t block_id, size_t channel_id) Get timestamp of point in nanoseconds, relative to scan timestamp. Includes firing time offset correction for channel and block.
bool	parse_packet (const std::vector< uint8_t > & packet) Validates and parse PandarPacket. Currently only checks size, not checksums etc.

Public Functions Documentation

function HesaiDecoder

Constructor.

inline explicit nebula::drivers::HesaiDecoder::HesaiDecoder (
    const std::shared_ptr< const HesaiSensorConfiguration > & sensor_configuration,
    const std::shared_ptr< const typename SensorT::angle_corrector_t::correction_data_t > & correction_data
) 

Parameters:

• sensor_configuration SensorConfiguration for this decoder
• correction_data Calibration data for this decoder

---

function get_pointcloud

Returns the point cloud and timestamp of the last scan.

inline virtual std::tuple< drivers::NebulaPointCloudPtr, double > nebula::drivers::HesaiDecoder::get_pointcloud () override

Returns:

A tuple of point cloud and timestamp in nanoseconds

Implements nebula::drivers::HesaiScanDecoder::get_pointcloud

---

function has_scanned

Indicates whether one full scan is ready.

inline virtual bool nebula::drivers::HesaiDecoder::has_scanned () override

Returns:

Whether a scan is ready

Implements nebula::drivers::HesaiScanDecoder::has_scanned

---

function unpack

Parses PandarPacket and add its points to the point cloud.

inline virtual int nebula::drivers::HesaiDecoder::unpack (
    const std::vector< uint8_t > & packet
) override

Parameters:

• packet The incoming PandarPacket

Returns:

The last azimuth processed

Implements nebula::drivers::HesaiScanDecoder::unpack

---

Protected Attributes Documentation

variable angle_corrector_

Decodes azimuth/elevation angles given calibration/correction data.

SensorT::angle_corrector_t nebula::drivers::HesaiDecoder< SensorT >::angle_corrector_;

---

variable block_firing_offset_ns_

For each return mode, the firing offset of each block relative to its packet in nanoseconds.

std::array<std::array<int, SensorT::packet_t::n_blocks>, SensorT::packet_t::max_returns> nebula::drivers::HesaiDecoder< SensorT >::block_firing_offset_ns_;

---

variable channel_firing_offset_ns_

For each channel, its firing offset relative to the block in nanoseconds.

std::array<int, SensorT::packet_t::n_channels> nebula::drivers::HesaiDecoder< SensorT >::channel_firing_offset_ns_;

---

variable decode_pc_

The point cloud new points get added to.

NebulaPointCloudPtr nebula::drivers::HesaiDecoder< SensorT >::decode_pc_;

---

variable decode_scan_timestamp_ns_

The timestamp of the scan currently in progress.

uint64_t nebula::drivers::HesaiDecoder< SensorT >::decode_scan_timestamp_ns_;

---

variable has_scanned_

Whether a full scan has been processed.

bool nebula::drivers::HesaiDecoder< SensorT >::has_scanned_;

---

variable last_azimuth_

uint32_t nebula::drivers::HesaiDecoder< SensorT >::last_azimuth_;

---

variable logger_

rclcpp::Logger nebula::drivers::HesaiDecoder< SensorT >::logger_;

---

variable output_pc_

The point cloud that is returned when a scan is complete.

NebulaPointCloudPtr nebula::drivers::HesaiDecoder< SensorT >::output_pc_;

---

variable output_scan_timestamp_ns_

The timestamp of the last completed scan in nanoseconds.

uint64_t nebula::drivers::HesaiDecoder< SensorT >::output_scan_timestamp_ns_;

---

variable packet_

The last decoded packet.

SensorT::packet_t nebula::drivers::HesaiDecoder< SensorT >::packet_;

---

variable scan_cut_angles_

ScanCutAngles nebula::drivers::HesaiDecoder< SensorT >::scan_cut_angles_;

---

variable sensor_

The sensor definition, used for return mode and time offset handling.

SensorT nebula::drivers::HesaiDecoder< SensorT >::sensor_;

---

variable sensor_configuration_

Configuration for this decoder.

const std::shared_ptr<const drivers::HesaiSensorConfiguration> nebula::drivers::HesaiDecoder< SensorT >::sensor_configuration_;

---

Protected Functions Documentation

function convert_returns

Converts a group of returns (i.e. 1 for single return, 2 for dual return, etc.) to points and appends them to the point cloud.

inline void nebula::drivers::HesaiDecoder::convert_returns (
    size_t start_block_id,
    size_t n_blocks
) 

Parameters:

• start_block_id The first block in the group of returns
• n_blocks The number of returns in the group (has to align with the n_returns field in the packet footer)

---

function get_distance

Get the distance of the given unit in meters.

inline float nebula::drivers::HesaiDecoder::get_distance (
    const typename SensorT::packet_t::body_t::block_t::unit_t & unit
) 

---

function get_point_time_relative

Get timestamp of point in nanoseconds, relative to scan timestamp. Includes firing time offset correction for channel and block.

inline uint32_t nebula::drivers::HesaiDecoder::get_point_time_relative (
    uint64_t scan_timestamp_ns,
    uint64_t packet_timestamp_ns,
    size_t block_id,
    size_t channel_id
) 

Parameters:

• scan_timestamp_ns Start timestamp of the current scan in nanoseconds
• packet_timestamp_ns The timestamp of the current PandarPacket in nanoseconds
• block_id The block index of the point
• channel_id The channel index of the point

---

function parse_packet

Validates and parse PandarPacket. Currently only checks size, not checksums etc.

inline bool nebula::drivers::HesaiDecoder::parse_packet (
    const std::vector< uint8_t > & packet
) 

Parameters:

• packet The incoming PandarPacket

Returns:

Whether the packet was parsed successfully

---

---

The documentation for this class was generated from the following file nebula_decoders/include/nebula_decoders/nebula_decoders_hesai/decoders/hesai_decoder.hpp