Fix Javascript/HTML Database Editor Tool Bugs (CAN bus DBC files)
$30-250 USD
Paid on delivery
We have a HTML/Javascript based file editor. This editor allows you to edit/load/download DBC files, which is a standardized database file format used within our industry. You can read about DBC files here: [login to view URL]
For a better overview of the project, see below:
[login to view URL]
The editor both enables the creation of the DBC file itself, but it also allows users to view the logic of how signals are encoded in the DBC file via the Signal Preview section. Further, users can test how raw data bytes are going to be decoded via the DBC file using the payload decoding section.
You can find the latest source code for the editor below:
[login to view URL]
The current version of the editor has some bugs and we are looking for a person to fix these, as well as help with future development projects.
This project requires good Javascript coding skills as you’ll need to digest a bit of code to identify the right spots to fix the bugs. Further, it is necessary that you have a good understanding of INTEL/MOTOROLA byte ordering and if possible it is an advantage if you are already familiar with CAN bus and DBC files - though not a requirement.
#1: vFrameFormat should be removed if a J1939PG message is changed to Standard/Extended
The DBC files include a meta section that contains various meta fields. One of these is called ‘vFrameFormat’ and it informs about what type of message identifier each ID is.
Currently the vFrameFormat meta section line is correctly added if a user creates a new J1939PG message, i.e. a line as below is added in the DBC file:
BA_ "VFrameFormat" BO_ MESSAGE_ID 3;
Here, the value “3” means that it’s a J1939 PGN type as defined by the line below (indexing starting from 0)
BA_DEF_ BO_ "VFrameFormat" ENUM "StandardCAN","ExtendedCAN","reserved","J1939PG";
However, the value is not correctly updated if the user instead specifies that a message is Standard or Extended, in which case the vFrameFormat value should instead be 0 or 1, respectively
Task: Update the editor so that the vFrameFormat value of a given message always matches the message type as follows:
Standard: 0
Extended: 1
J1939PG: 2
#2: Intel/Motorola is currently not handled correctly for data payload decoding
Currently, the little/big endian works correctly for the ‘CAN signal preview’ section to the left. Note in particular that the byte order changes when changing between Intel and Motorola. However, in the right-side payload decoding, this is not implemented correctly.
Task 1: Replicate the byte order index column to the left of the Data column in order to make it explicit what the byte order is. This should match 1:1 the index column that is currently showing to the left of the CAN signal preview.
[see [login to view URL]]
Task 2: In the blue line at the bottom where it says “Data = [hex value] = [decimal value]”, please make it so that it says “Data = [binary value] = [hex value] = [decimal value]” using “0b” in front of the binary number.
Task 3 (correct Intel decoding): The ordering of the extracted bits must be done correctly based on whether the user is considering Intel or Motorola signals. Consider the below example using this DBC file: [login to view URL]
[see [login to view URL]]
The correct ‘raw payload’ in this example is in binary form 10111110 1000 because the signal is Intel and hence the bits from Byte 6 should be placed after the bits from Byte 7 - not before. The final value should thus become 1000 degC for BRTemp in this example.
Please update the editor so that the data payload is correctly calculated using Intel byte ordering.
As another test, this update should result in the default example with EngineSpeed ending up with the value 1090.375 RPM instead of 612.15 RPM.
Task 4 (correct Motorola decoding): Similarly, the Motorola decoding is currently not working correctly. To see this, you can load the following test DBC and insert the payload as in below example. The correct value should be as follows:
[login to view URL]
Data = 0b0100010010000100 = 0x4484 = 17540
Physical value = 1 * 17540 + 1 = 17541
In other words, the ordering of the bit chunks should be corrected for Motorola.
[see [login to view URL]]
Project ID: #37864395
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