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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')