Why does the LIN Pack/Unpack block fail to parse the LDF file with the error "Unable to parse the signal representation section in the LDF file"?

Why do I get the following error with the LIN Pack or LIN Unpack block from the Simulink Real-Time library?

Unable to parse the signal representation section in the LDF file.

Answer 1

[MathWorks Support Team]

This error may indicate that the signal representation section in the LDF file is malformed. As a result, it cannot be parsed by the LDF file parser and the block throws the error dialog.

Here is an example of a malformed signal representation section:

Signal_representation {
c02_LIN_Sig_1 : LIN_Sig_1;
c02_LIN_Sig_64_Encd : LIN_Sig_19, LIN_Sig_20, LIN_Sig_25, LIN_Sig_25,
LIN_Sig_31, LIN_Sig_34;
}

There are two issues in the signal representation section:

1. For each signal_representation token in the file, there is a space after the signal representation name and before the ":". This space should be removed.

2. There is a new line character in a single signal_representation token. Every token should be in one line.

The fixed signal representation section would looks like this:

Signal_representation {
c02_LIN_Sig_1: LIN_Sig_1;
c02_LIN_Sig_64_Encd: LIN_Sig_19, LIN_Sig_20, LIN_Sig_25, LIN_Sig_25, LIN_Sig_31, LIN_Sig_34;
}

If the above tips don't apply, please contact MathWorks Technical Support and send us the LDF file for further investigation.