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    %% Integrate External C Functions That Pass Input Arguments By Value Versus Address
% This example shows how to use the Legacy Code Tool to integrate legacy C 
% functions that pass their input arguments by value versus address. 
%
% With the Legacy Code Tool, you can:
%
% * Provide the legacy function specification.
% * Generate a C-MEX S-function that calls the legacy code during
% simulation.
% * Compile and build the generated S-function for simulation.
% * Generate a TLC block file and optional rtwmakecfg.m file that specifies
% how the generated code for a model calls the legacy code.

%   Copyright 1990-2015 The MathWorks, Inc.

%% Provide the Legacy Function Specification
% Legacy Code Tool functions take a specific data structure or array of
% structures as the argument. You can initialize the data structure by
% calling the function legacy_code() using 'initialize' as the first input.
% After initializing the structure, assign its properties to values
% corresponding to the legacy code being integrated. For detailed help on
% the properties, call <matlab:legacy_code('help') legacy_code('help')>.
% The prototypes of the legacy functions being called in this example are:
%
% * FLT filterV1(const FLT signal, const FLT prevSignal, const FLT gain)
% * FLT filterV2(const FLT* signal, const FLT prevSignal, const FLT gain)
%
% FLT is a typedef to float.  The legacy source code is in the
% files <matlab:rtwdemo_lct_util('edit','rtwdemo_lct_src/your_types.h') your_types.h>, 
% <matlab:rtwdemo_lct_util('edit','rtwdemo_lct_src/myfilter.h') myfilter.h>,
% <matlab:rtwdemo_lct_util('edit','rtwdemo_lct_src/filterV1.c') filterV1.c>, and
% <matlab:rtwdemo_lct_util('edit','rtwdemo_lct_src/filterV2.c') filterV2.c>.
%
% Note the difference in the OutputFcnSpec defined in the two structures; the
% first case specifies that the first input argument is passed by
% value, while the second case specifies pass by pointer.

defs = [];

% rtwdemo_sfun_filterV1
def = legacy_code('initialize');
def.SFunctionName = 'rtwdemo_sfun_filterV1';
def.OutputFcnSpec = 'single y1 = filterV1(single u1, single u2, single p1)';
def.HeaderFiles   = {'myfilter.h'};
def.SourceFiles   = {'filterV1.c'};
def.IncPaths      = {'rtwdemo_lct_src'}; 
def.SrcPaths      = {'rtwdemo_lct_src'}; 
defs = [defs; def];

% rtwdemo_sfun_filterV2
def = legacy_code('initialize');
def.SFunctionName = 'rtwdemo_sfun_filterV2';
def.OutputFcnSpec = 'single y1 = filterV2(single u1[1], single u2, single p1)';
def.HeaderFiles   = {'myfilter.h'};
def.SourceFiles   = {'filterV2.c'};
def.IncPaths      = {'rtwdemo_lct_src'}; 
def.SrcPaths      = {'rtwdemo_lct_src'}; 
defs = [defs; def];


%%  Generate S-Functions for Simulation
% To generate C-MEX S-functions according to the description provided by
% the input argument 'defs', call the function legacy_code() again with the
% first input set to 'sfcn_cmex_generate'. The S-functions call the legacy
% functions in simulation. The source code for the S-functions is in the
% files
% <matlab:rtwdemo_lct_util('edit','rtwdemo_sfun_filterV1.c') rtwdemo_sfun_filterV1.c> and
% <matlab:rtwdemo_lct_util('edit','rtwdemo_sfun_filterV2.c') rtwdemo_sfun_filterV2.c>.

legacy_code('sfcn_cmex_generate', defs);

%% Compile the Generated S-Functions for Simulation
% After you generate the C-MEX S-function source files, to compile the
% S-functions for simulation with Simulink(R), call the function
% legacy_code() again with the first input set to 'compile'.

legacy_code('compile', defs);

%% Generate TLC Block Files for Code Generation
% After you compile the S-functions and use them in simulation, you can
% call the function legacy_code() again with the first input set to
% 'sfcn_tlc_generate' to generate TLC block files. Block files specify how
% the generated code for a model calls the legacy code. If you do not
% generate TLC block files and you try to generate code for a model that
% includes the S-functions, code generation fails. The TLC block files for
% the S-functions are
% <matlab:rtwdemo_lct_util('edit','rtwdemo_sfun_filterV1.tlc') rtwdemo_sfun_filterV1.tlc> and
% <matlab:rtwdemo_lct_util('edit','rtwdemo_sfun_filterV2.tlc') rtwdemo_sfun_filterV2.tlc>.

legacy_code('sfcn_tlc_generate', defs);

%% Generate an rtwmakecfg.m File for Code Generation
% After you create the TLC block files, you can call the function
% legacy_code() again with the first input set to 'rtwmakecfg_generate' to
% generate an rtwmakecfg.m file to support code generation. If the required
% source and header files for the S-functions are not in the same folder as
% the S-functions, and you want to add these dependencies in the makefile
% produced during code generation, generate the rtwmakecfg.m file.

legacy_code('rtwmakecfg_generate', defs);

%% Generate Masked S-Function Blocks for Calling the Generated S-Functions
% After you compile the C-MEX S-function source, you can call the function
% legacy_code() again with the first input set to 'slblock_generate' to
% generate masked S-function blocks that call the S-functions.  The
% software places the blocks in a new model. From there you can copy them
% to an existing model. 

legacy_code('slblock_generate', defs);

%% Show the Generated Integration with Legacy Code
% The model <matlab:rtwdemo_lct_filter rtwdemo_lct_filter> 
% shows integration of the model with the legacy
% code.  The subsystem TestFilter serves as a harness for the calls to the
% legacy C functions via the generate S-functions, with unit delays serving to 
% store the previous output values.

open_system('rtwdemo_lct_filter')
open_system('rtwdemo_lct_filter/TestFilter')
sim('rtwdemo_lct_filter')