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High-Level Synthesis Code Generation for DF2T Filter

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You can generate High-Level Synthesis (HLS) code from MATLAB® design for direct-form II transposed filter.

MATLAB Design

Set up the df2t_filter model and test bench for this example.

mlhdlc_demo_setup('df2t_filter');

% Design Sqrt
design_name = 'mlhdlc_df2t_filter';

% Test Bench for Sqrt
testbench_name = 'mlhdlc_df2t_filter_tb';

Successfully copied: mlhdlc_df2t_filter
Successfully copied: mlhdlc_df2t_filter_runme
Successfully copied: mlhdlc_df2t_filter_tb

Review the df2t_filter design

dbtype(design_name)

1     %#codegen
2     function y = mlhdlc_df2t_filter(x)
3     
4     %   Copyright 2011-2015 The MathWorks, Inc.
5     
6     persistent z;
7     if isempty(z)
8         % Filter states as a column vector
9         z = zeros(2,1);
10    end
11    
12    % Filter coefficients as constants
13    b = [0.29290771484375   0.585784912109375  0.292907714843750];
14    a = [1.0                0.0                0.171600341796875];
15    
16    y    =  b(1)*x + z(1);
17    z(1) = (b(2)*x + z(2)) - a(2) * y;
18    z(2) =  b(3)*x - a(3) * y;
19    
20    end

Simulate the Design

It is a best practice to simulate the design with the test bench prior to code generation to check for run-time errors.

mlhdlc_df2t_filter_tb

Create a HDL Coder™ Project

Create an HDL Coder project.

coder -hdlcoder -new mlhdlc_df2t_prj

Next, add the file mlhdlc_df2t_filter.m to the project as the MATLAB Function and mlhdlc_df2t_filter_tb.m as the MATLAB Test Bench.

Run Fixed-Point Conversion and HLS Code Generation

To generate HLS code from the MATLAB design:

1. At the MATLAB command line, set up the path for HLS code generation by using the function hdlsetuphlstoolpath.

2. Start the Workflow Advisor by clicking the Workflow Advisor button.

3. In the HDL Workflow Advisor, select Code Generation Workflow as MATLAB to HLS.

4. Select Cadence Stratus as the Synthesis tool for Select Code Generation Target.

5. Right-click the HLS Code Generation task and select Run to selected task to run all the steps from the beginning through the HLS code generation.

Examine the generated HLS code by clicking the hyperlinks in the HLS Code Generation log window. For more information, see Get Started with MATLAB to High-Level Synthesis Workflow Using HDL Coder App.

See Also