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Utilities to decode CAN log files

Project description

This package lets you DBC decode raw CAN data from the CANedge to human-readable form (physical values) in Python.

Key features

Installation

Use pip to install the can_decoder module:

Optionally install canmatrix and pandas to load DBC files and enable conversion of pandas dataframes:

Dependencies

numpy (required)
canmatrix (optional)
pandas (optional)

Module usage example

Dbc File Viewer Windows 10

Below we load a log file via mdf_iter and use can_decoder to DBC decode it:

Further examples are included in the repo.

Documentation

Supplying decoding rules

Data decoding is based on a set of signals which can be grouped together in frames. The frames in turn are grouped together in a single database. The list of rules can be crafted by hand, using the primitives Signal, Frame and SignalDB - or generated from a DBC file.

From a DBC file

If canmatrix is installed, the library can load the conversion rules from a DBC file: Download interstellar 720p bluray.

By default, the output will distinguish signals by the signal name (e.g. EngineSpeed). It is possible to switch from the primary signal name to another signal attribute in the DBC file by supplying the optional use_custom_attribute keyword. This takes the form of a string, and can e.g. be used to select SPNs instead of signal names in a J1939 DBC file. If no valid attribute is found, the signal name is used instead.

Data conversion

The library supports two methods of decoding data:

Iteratively
Bulk

Data conversion (iterator)

For iterative decoding (frame-by-frame), the library uses the IteratorDecoder class. This class takes a set of conversion rules (e.g. from a DBC file) and an iterable object (e.g. a MDF file):

This method expects an iterator structure like that of mdf_iter - incl. the following fields:

ID - integer specifying the 11 or 29 bit CAN ID
IDE - boolean specifying if the record uses a regular 11 bit ID or an extended 29 bit ID
DataBytes - A bytearray, in the order the data bytes appear on the CAN bus.
TimeStamp - A floating point number, representing seconds passed since epoch

In the case multiple signals are defined from a single ID, the library iterator will queue them internally, deferring the request for more data until all signals have been consumed from the iterator.

The output is of the form decoded_signal, which is a namedtuple with the following fields:

TimeStamp - timestamp of the record as regular Python datetime
CanID - CAN ID from the sending frame
Signal - name of the decoded signal
SignalValueRaw - raw value of the decoded signal
SignalValuePhysical - physical value of the decoded signal

Data conversion (DataFrame)

For batch conversion of messages, the library uses the DataFrameDecoder class. This is constructed with the conversion rules as a parameter and can be re-used several times from the same set of parameters:

The data supplied should be similar to that of the iterator method, but as a DataFrame. See also the initial example. Unlike the iterator component, this method does not require the presence of a time stamp entry. Instead, the index of the DataFrame passed to the decoder will be used as the index in the resulting DataFrame.

The output is a dataframe with the same index as the input dataframe, containing decoded results for the frames matched by the loaded DBC file.

DataFrame output columns

The available signals in the output depends on the type of conversion. For generic CAN data (incl. Megastat 10.3. OBD2), the following output columns are included:

CAN ID - CAN ID of the frame, with the extended flag set as the most significant bit
Signal - signal name string
Raw Value - the raw value used as input in the decoding
Physical Value - the physical value (after scaling and offset correction)

When decoding data using a J1939 DBC, the output includes the following extra columns:

PGN - the PGN of the CAN frame
Source Address - the source of the data
Signal - the signal name

To remove columns from the output you can use the keyword columns_to_drop:

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