uds.can.transport_interface.common

Definition of UDS Transport Interface for CAN bus.

Classes

AbstractCanTransportInterface

Abstract definition of Transport Interface for managing Diagnostics on CAN.

Module Contents

class uds.can.transport_interface.common.AbstractCanTransportInterface(network_manager, addressing_information, n_as_timeout=N_AS_TIMEOUT, n_ar_timeout=N_AR_TIMEOUT, n_bs_timeout=N_BS_TIMEOUT, n_cr_timeout=N_CR_TIMEOUT, n_br=DEFAULT_N_BR, n_cs=DEFAULT_N_CS, flow_control_parameters_generator=DEFAULT_FLOW_CONTROL_PARAMETERS, **segmenter_configuration)

Bases: uds.transport_interface.AbstractTransportInterface, abc.ABC

Abstract definition of Transport Interface for managing Diagnostics on CAN.

CAN Transport Interfaces are meant to handle UDS middle layers (Transport and Network) on CAN bus.

Create Transport Interface (an object for handling UDS Transport and Network layers).

Parameters:

• network_manager (Any) – An object that handles CAN bus (Physical and Data layers of OSI Model).

• addressing_information (uds.can.addressing.AbstractCanAddressingInformation) – Addressing Information of UDS entity simulated by this CAN Transport Interface.

• n_as_timeout (uds.utilities.TimeMillisecondsAlias) – Timeout value for N_As time parameter.

• n_ar_timeout (uds.utilities.TimeMillisecondsAlias) – Timeout value for N_Ar time parameter.

• n_bs_timeout (uds.utilities.TimeMillisecondsAlias) – Timeout value for N_Bs time parameter.

• n_cr_timeout (uds.utilities.TimeMillisecondsAlias) – Timeout value for N_Cr time parameter.

• n_br (uds.utilities.TimeMillisecondsAlias) – Value of N_Br time parameter to use in communication.

• n_cs (Optional[uds.utilities.TimeMillisecondsAlias]) – Value of N_Cs time parameter to use in communication.

• flow_control_parameters_generator (uds.can.packet.AbstractFlowControlParametersGenerator) – Generator with Flow Control parameters to use.

• segmenter_configuration (Any) –

  Configuration parameters for CAN Segmenter.

  • parameter dlc:

    Base CAN DLC value to use for CAN packets.

  • parameter use_data_optimization:

    Information whether to use CAN Frame Data Optimization.

  • parameter filler_byte:

    Filler byte value to use for CAN Frame Data Padding.

N_AS_TIMEOUT: uds.utilities.TimeMillisecondsAlias = 1000

Timeout value of N_As time parameter according to ISO 15765-2.

N_AR_TIMEOUT: uds.utilities.TimeMillisecondsAlias = 1000

Timeout value of N_Ar time parameter according to ISO 15765-2.

N_BS_TIMEOUT: uds.utilities.TimeMillisecondsAlias = 1000

Timeout value of N_Bs time parameter according to ISO 15765-2.

N_CR_TIMEOUT: uds.utilities.TimeMillisecondsAlias = 1000

Timeout value of N_Cr time parameter according to ISO 15765-2.

DEFAULT_N_BR: uds.utilities.TimeMillisecondsAlias = 0

Default value for N_Br time parameter.

DEFAULT_N_CS: uds.utilities.TimeMillisecondsAlias | None = None

Default value for N_Cs time parameter.

DEFAULT_FLOW_CONTROL_PARAMETERS

Default values generator for Flow Control parameters (Flow Status, Block Size, Separation Time minimum).

__n_ar_measured: uds.utilities.TimeMillisecondsAlias | None = None

__n_as_measured: uds.utilities.TimeMillisecondsAlias | None = None

__n_bs_measured: Tuple[uds.utilities.TimeMillisecondsAlias, Ellipsis] | None = None

__n_cr_measured: Tuple[uds.utilities.TimeMillisecondsAlias, Ellipsis] | None = None

property n_as_timeout: uds.utilities.TimeMillisecondsAlias

Timeout value for N_As time parameter.

Return type:

uds.utilities.TimeMillisecondsAlias

property n_ar_timeout: uds.utilities.TimeMillisecondsAlias

Timeout value for N_Ar time parameter.

Return type:

uds.utilities.TimeMillisecondsAlias

property n_bs_timeout: uds.utilities.TimeMillisecondsAlias

Timeout value for N_Bs time parameter.

Return type:

uds.utilities.TimeMillisecondsAlias

property n_cr_timeout: uds.utilities.TimeMillisecondsAlias

Timeout value for N_Cr time parameter.

Return type:

uds.utilities.TimeMillisecondsAlias

property n_br: uds.utilities.TimeMillisecondsAlias

Get the value of N_Br time parameter which is currently set.

Note

The actual (observed on the bus) value will be slightly longer as it also includes computation and CAN Interface delays.

Return type:

uds.utilities.TimeMillisecondsAlias

property n_cs: uds.utilities.TimeMillisecondsAlias | None

Get the value of N_Cs time parameter which is currently set.

Note

The actual (observed on the bus) value will be slightly longer as it also includes computation and CAN Interface delays.

Return type:

Optional[uds.utilities.TimeMillisecondsAlias]

property flow_control_parameters_generator: uds.can.packet.AbstractFlowControlParametersGenerator

Get generator of Flow Control parameters (Flow Status, Block Size, Separation Time minimum).

Return type:

uds.can.packet.AbstractFlowControlParametersGenerator

property segmenter: uds.can.segmenter.CanSegmenter

Get the segmenter used by this CAN Transport Interface.

Return type:

uds.can.segmenter.CanSegmenter

_update_n_ar_measured(value)

Update measured values of N_Ar.

Parameters:

value (uds.utilities.TimeMillisecondsAlias) – Value to set.

Raises:

• TypeError – Provided value is not time in milliseconds.

• ValueError – Provided value is out of range.

Return type:

None

_update_n_as_measured(value)

Update measured values of N_As.

Parameters:

value (uds.utilities.TimeMillisecondsAlias) – Value to set.

Raises:

• TypeError – Provided value is not time in milliseconds.

• ValueError – Provided value is out of range.

Return type:

None

_update_n_bs_measured(message_record)

Update measured values of N_Bs according to timestamps of CAN packet records.

Parameters:

message_record (uds.message.UdsMessageRecord) – Record of UDS message transmitted over CAN.

Raises:

• TypeError – Provided value is not UDS message record.

• ValueError – Provided UDS message record was not transmitted.

Return type:

None

_update_n_cr_measured(message_record)

Update measured values of N_Cr according to timestamps of CAN packet records.

Parameters:

message_record (uds.message.UdsMessageRecord) – Record of UDS message received over CAN.

Raises:

• TypeError – Provided value is not UDS message record.

• ValueError – Provided UDS message record was not received.

Return type:

None

clear_measurements()

Clear measured values of CAN communication parameters.

Return type:

None

property n_as_measured: uds.utilities.TimeMillisecondsAlias | None

Get the last measured value of N_As time parameter.

Note

The last measurement comes from the last transmission of Single Frame or First Fame CAN Packet using either send_packet() or async_send_packet() method.

Returns:

Time in milliseconds or None if the value was never measured.

Return type:

Optional[uds.utilities.TimeMillisecondsAlias]

property n_ar_measured: uds.utilities.TimeMillisecondsAlias | None

Get the last measured value of N_Ar time parameter.

Note

The last measurement comes from the last transmission of Flow Control CAN Packet using either receive_packet() or async_receive_packet() method.

Returns:

Time in milliseconds or None if the value was never measured.

Return type:

Optional[uds.utilities.TimeMillisecondsAlias]

property n_bs_measured: Tuple[uds.utilities.TimeMillisecondsAlias, Ellipsis] | None

Get the last measured values of N_Bs time parameter.

Note

The last measurement comes from the last transmission of UDS message using either send_message() or async_send_message() method.

Returns:

Tuple with times in milliseconds or None if the values could not be measured.

Return type:

Optional[Tuple[uds.utilities.TimeMillisecondsAlias, Ellipsis]]

property n_br_max: uds.utilities.TimeMillisecondsAlias

Get the maximum valid value of N_Br time parameter.

Warning

To assess maximal value of N_Br, the actual value of N_Ar time parameter is required. Either the latest measured value of N_Ar would be used, or 0ms would be assumed (if there are no measurement result).

Return type:

uds.utilities.TimeMillisecondsAlias

property n_cs_max: uds.utilities.TimeMillisecondsAlias

Get the maximum valid value of N_Cs time parameter.

Warning

To assess maximal value of N_Cs, the actual value of N_As time parameter is required. Either the latest measured value of N_As would be used, or 0ms would be assumed (if there are no measurement result).

Return type:

uds.utilities.TimeMillisecondsAlias

property n_cr_measured: Tuple[uds.utilities.TimeMillisecondsAlias, Ellipsis] | None

Get the last measured values of N_Cr time parameter.

Note

The last measurement comes from the last reception of UDS message using either receive_message() or async_receive_message() method.

Returns:

Tuple with times in milliseconds or None if the values could not be measured.

Return type:

Optional[Tuple[uds.utilities.TimeMillisecondsAlias, Ellipsis]]

property dlc: int

Value of base CAN DLC to use for output CAN packets.

Note

All output CAN packets will have this DLC value set unless CAN Frame Data Optimization is used.

Return type:

int

property use_data_optimization: bool

Information whether to use CAN Frame Data Optimization during CAN packets creation.

See also

CAN Frame Data Optimization

Return type:

bool

property filler_byte: int

Filler byte value to use for output CAN Frame Data Padding during segmentation.

See also

CAN Frame Data Padding

Return type:

int