MATLAB Examples

Improve Code Readability by Generating Block Parameter Values as Macros

When you generate efficient code by inlining the numeric values of block parameters (with the configuration parameter Default parameter behavior), you can configure scalar parameters to appear as macros instead of literal numbers. Each macro has a unique name that is based on the name of the corresponding block parameter.

Open the example model sldemo_fuelsys_dd_controller.

sldemo_fuelsys_dd_controller

The model uses these configuration parameter settings:

  • Default parameter behavior set to Inlined.
  • System target file set to ert.tlc.

Set the configuration parameter Generate scalar inlined parameters as to Macros.

set_param('sldemo_fuelsys_dd_controller','InlinedPrmAccess','Macros')

Generate code from the model.

rtwbuild('sldemo_fuelsys_dd_controller')
### Starting build procedure for model: sldemo_fuelsys_dd_controller
### Successful completion of code generation for model: sldemo_fuelsys_dd_controller

The header file sldemo_fuelsys_dd_controller_private.h defines several macros that represent inlined (nontunable) block parameters. For example, the macros rtCP_DiscreteFilter_NumCoe_EL_0 and rtCP_DiscreteFilter_NumCoe_EL_1 represent floating-point constants.

file = fullfile('sldemo_fuelsys_dd_controller_ert_rtw',...
    'sldemo_fuelsys_dd_controller_private.h');
rtwdemodbtype(file,'#define rtCP_DiscreteFilter_NumCoe_EL_0',...
    'rtCP_DiscreteFilter_NumCoe_EL_1',1,1)
#define rtCP_DiscreteFilter_NumCoe_EL_0 (8.7696F)
#define rtCP_DiscreteFilter_NumCoe_EL_1 (-8.5104F)

The comments above the macro definitions indicate that the code generated for a Discrete Filter block uses the macros.

rtwdemodbtype(file,'Computed Parameter: DiscreteFilter_NumCoef',...
    'Referenced by: ''<S12>/Discrete Filter''',1,1)
/* Computed Parameter: DiscreteFilter_NumCoef
 * Referenced by: '<S12>/Discrete Filter'

Click the hyperlink to navigate to the block in the model.