Generating a C Header File

You may want to include filter information in an external C program. To create a C header file with variables that contain filter parameter data, follow this procedure:

1. Select Targets > Generate C Header. The Generate C Header dialog box appears.

   

2. Enter the variable names to be used in the C header file. The particular filter structure determines the variables that are created in the file

   Filter Structure	Variable Parameter
   Direct-form I Direct-form II Direct-form I transposed Direct-form II transposed	Numerator, Numerator length*, Denominator, Denominator length*, and Number of sections (inactive if filter has only one section)
   Lattice ARMA	Lattice coeffs, Lattice coeffs length*, Ladder coeffs, Ladder coeffs length*, Number of sections (inactive if filter has only one section)
   Lattice MA	Lattice coeffs, Lattice coeffs length*, and Number of sections (inactive if filter has only one section)
   Direct-form FIR Direct-form FIR transposed	Numerator, Numerator length*, and Number of sections (inactive if filter has only one section)

   *length variables contain the total number of coefficients of that type.

   Note   Variable names cannot be C language reserved words, such as "for."

3. Select Export Suggested to use the suggested data type or select Export As and select the desired data type from the pull-down.

   Note   If you do not have DSP System Toolbox software installed, selecting any data type other than double-precision floating point results in a filter that does not exactly match the one you designed in the FDATool. This is due to rounding and truncating differences.

4. Click OK to save the file and close the dialog box or click Apply to save the file, but leave the dialog box open for additional C header file definitions.

Exporting a Filter Design

Generating MATLAB Code

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