www.gusucode.com > simulinkcoder 案例源码程序 matlab代码 > simulinkcoder/IntegrateExtCFuncsThatPassOutputArgAsReturnArgExample.m
%% Integrate External C Functions That Pass the Output Argument As a Return Argument % This example shows how to use the Legacy Code Tool to integrate legacy C % functions that pass their output as a return argument. % % 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 prototype of the legacy functions being called in this example is: % % FLT gainScalar(const FLT in, 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/gain.h') gain.h>, and % <matlab:rtwdemo_lct_util('edit','rtwdemo_lct_src/gainScalar.c') gainScalar.c>. % rtwdemo_sfun_gain_scalar def = legacy_code('initialize'); def.SFunctionName = 'rtwdemo_sfun_gain_scalar'; def.OutputFcnSpec = 'single y1 = gainScalar(single u1, single p1)'; def.HeaderFiles = {'gain.h'}; def.SourceFiles = {'gainScalar.c'}; def.IncPaths = {'rtwdemo_lct_src'}; def.SrcPaths = {'rtwdemo_lct_src'}; %% Generate an S-Function for Simulation % To generate a C-MEX S-function according to the description provided by % the input argument 'def', call the function legacy_code() again with the % first input set to 'sfcn_cmex_generate'. The S-function calls the legacy % functions during simulation. % The source code for the S-function is in the file % <matlab:rtwdemo_lct_util('edit','rtwdemo_sfun_gain_scalar.c') rtwdemo_sfun_gain_scalar.c>. legacy_code('sfcn_cmex_generate', def); %% Compile the Generated S-Function for Simulation % After you generate the C-MEX S-function source file, to compile the % S-function for simulation with Simulink(R), call the function % legacy_code() again with the first input set to 'compile'. legacy_code('compile', def); %% Generate a TLC Block File for Code Generation % After you compile the S-function and use it in simulation, you can call % the function legacy_code() again with the first input set to % 'sfcn_tlc_generate' to generate a TLC block file. The block file % specifies how the generated code for a model calls the legacy code. If % you do not generate a TLC block file and you try to generate code for a % model that includes the S-function, code generation fails. The TLC block % file for the S-function is: % <matlab:rtwdemo_lct_util('edit','rtwdemo_sfun_gain_scalar.tlc') rtwdemo_sfun_gain_scalar.tlc>. legacy_code('sfcn_tlc_generate', def); %% Generate an rtwmakecfg.m File for Code Generation % After you create the TLC block file, 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-function are not in the same folder as % the S-function, and you want to add these dependencies in the makefile % produced during code generation, generate the rtwmakecfg.m file. legacy_code('rtwmakecfg_generate', def); %% Generate a Masked S-Function Block for Calling the Generated S-Function % 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 a masked S-function block that calls that S-function. The % software places the block in a new model. From there you can copy it to % an existing model. legacy_code('slblock_generate', def); %% Show the Generated Integration with Legacy Code % The model <matlab:rtwdemo_lct_gain rtwdemo_lct_gain> % shows integration of the model with the legacy % code. The subsystem TestGain serves as a harness for the call to the % legacy C function via the generate S-function. open_system('rtwdemo_lct_gain') open_system('rtwdemo_lct_gain/TestGain') sim('rtwdemo_lct_gain')