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Known Software Problems

13-15

Known Software Problems

The following sections describe some of the known DSP Blockset problems and

limitations:

•“Real-Time Workshop C Code Generation Limitations”

•“Nonzero Simulation Start Times Not Supported”

•“Triggered and Enabled Subsystem Support”

•“Digital Filter Design Block Limitations”

•“Magnitude FFT Block Limitations”

Real-Time Workshop C Code Generation Limitations

C code generated from DSP Blockset blocks using Real-Time Workshop has the

following limitations:

•DSP Blockset generally does not support the

Loop rolling threshold

parameter (visible when the

Category parameter is set to General code

generation options

) in the Real-Time Workshop tab of the Simulink

Simulation Parameters dialog.

•Currently, the DSP Blockset run-time library

dsp_rt.lib does not always

rebuild when you change compiler or linker options. Thus, before changing

compiler and linker options, you should delete

dsp_rt.lib and all associated

object files. You can change compiler and linker options in the Simulink

Simulation Parameters dialog’s Real-Time Workshop tab by setting make

command arguments such as

OPTS or OPT_OPTS in the Make command

parameter (for example,

make_rtw OPTS="-DMYDEFINE=1").

Nonzero Simulation Start Times Not Supported

The DSP Blockset does not support nonzero simulation start times. When

running a simulation with DSP Blockset blocks, you must set the

Start time

option in the Simulink

Simulation Parameters dialog’s Solver tab to 0.

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