Code generation assertion '-1 < fDTypeID' failed in 'b:\matlab​\src\slcg_​impl\expor​t\include\​slcg_impl\​rtwgen\rtw​signal.hpp​:207'

when generate code, an issue occured, Code generation assertion '-1 < fDTypeID' failed in 'b:\matlab\src\slcg_impl\export\include\slcg_impl\rtwgen\rtwsignal.hpp:207'

I don't know how to identify the root cause of this failure, could you kindly give some suggestions, thank you.

Answer 1

[Harsh]

Hi

The error "Code generation assertion '-1 < fDTypeID' failed" in MATLAB typically occurs due to data type mismatches within a muxed signal during code generation. This issue may arise when:

1. A Mux block contains signals of different data types.
2. Specific optimizations in code generation interact with this mismatch, leading to an assertion failure.

To resolve this error, please consider following workarounds-

1. Use a Bus Instead of a Mux: Replace the Mux block with a Bus Creator block, as buses can handle signals of different data types properly.
2. Ensure Consistent Data Types: If using a Mux, make sure all input signals have the same data type. Use a Signal Specification block to enforce uniform data types before the Mux.
3. Use a Demux: If necessary, use a Demux block to separate signals before re-processing them into a bus.

Please use the following command to open documentation for Demux, Mux and Simulink.Bus :

doc Demux 
doc Mux 
doc Simulink.Bus