www.gusucode.com > rtwdemos 工具箱matlab源码程序 > rtwdemos/rtwdemo_lct_fixpt_params_script.m
%% Fixed Point Parameters % This example shows you how to use the Legacy Code Tool to integrate legacy C % functions that pass their inputs and outputs using parameters of fixed point % data type. % % The Legacy Code Tool allows you to: % % * Provide the legacy function specification, % * Generate a C-MEX S-function that is used during simulation to call the legacy code, % * Compile and build the generated S-function for simulation, and % * Generate a block TLC file and optional rtwmakecfg.m file that is used during code generation to call the legacy code. % % Copyright 1990-2012 The MathWorks, Inc. %% Providing the Legacy Function Specification % Functions provided with the Legacy Code Tool take a specific data % structure or array of structures as the argument. The data structure is % initialized by calling the function legacy_code() using 'initialize' as the % first input. After initializing the structure, you have to 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: % % myFixpt timesS16(const myFixpt in1, const myFixpt in2, const uint8_T fracLength) % % where myFixpt is logically a fixed point data type which is physically % a typedef to a 16-bit integer: myFixpt = Simulink.NumericType; myFixpt.DataTypeMode = 'Fixed-point: binary point scaling'; myFixpt.Signed = true; myFixpt.WordLength = 16; myFixpt.FractionLength = 10; myFixpt.IsAlias = true; myFixpt.HeaderFile = 'timesFixpt.h'; %% % The legacy source code is found in the files % <matlab:rtwdemo_lct_util('edit','rtwdemo_lct_src/timesFixpt.h') timesFixpt.h>, and % <matlab:rtwdemo_lct_util('edit','rtwdemo_lct_src/timesS16.c') timesS16.c>. % rtwdemo_sfun_gain_fixpt def = legacy_code('initialize'); def.SFunctionName = 'rtwdemo_sfun_gain_fixpt'; def.OutputFcnSpec = 'myFixpt y1 = timesS16(myFixpt u1, myFixpt p1, uint8 p2)'; def.HeaderFiles = {'timesFixpt.h'}; def.SourceFiles = {'timesS16.c'}; def.IncPaths = {'rtwdemo_lct_src'}; def.SrcPaths = {'rtwdemo_lct_src'}; %% Generating an S-Function for Use During Simulation % The function legacy_code() is called again with the first input set to % 'sfcn_cmex_generate' in order to automatically generate a C-MEX S-function % according to the description provided by the input argument 'def'. % This S-function is used to call the legacy functions in simulation. % The source code for the S-function is found in the file % <matlab:rtwdemo_lct_util('edit','rtwdemo_sfun_gain_fixpt.c') rtwdemo_sfun_gain_fixpt.c>. legacy_code('sfcn_cmex_generate', def); %% Compiling the Generated S-Function for Simulation % After the C-MEX S-function source file is generated, the function % legacy_code() is called again with the first input set to 'compile' in order % to compile the S-function for simulation with Simulink(R). legacy_code('compile', def); %% Generating a TLC Block File for Code Generation % After the S-function is compiled and used in simulation, the function % legacy_code() can be called again with the first input set to % 'sfcn_tlc_generate' in order to generate a TLC block file to support % code generation through Simulink(R) Coder(TM). Code generation will fail % if the TLC block file is not created and you try to generate code for a model % that includes the S-function. The TLC block file for the S-function is: % <matlab:rtwdemo_lct_util('edit','rtwdemo_sfun_gain_fixpt.tlc') rtwdemo_sfun_gain_fixpt.tlc>. legacy_code('sfcn_tlc_generate', def); %% Generating an rtwmakecfg.m File for Code Generation % After the TLC block file is created, the function % legacy_code() can be called again with the first input set to % 'rtwmakecfg_generate' in order to generate an rtwmakecfg.m file to support % code generation through Simulink(R) Coder(TM). Generate the rtwmakecfg.m % file if the required source and header files for the S-functions are not % in the same directory as the S-functions, and you want to add these % dependencies in the makefile produced during code generation. legacy_code('rtwmakecfg_generate', def); %% Generating a masked S-Function block for calling the generated S-Function % After the C-MEX S-function source is compiled, the function % legacy_code() can be called again with the first input set to 'slblock_generate' in order % to generate a masked S-function block that is configured to call that % S-function. The block is placed in a new model and can be copied to an % existing model. % legacy_code('slblock_generate', def); %% Showing the Generated Integration with Legacy Code % The model <matlab:rtwdemo_lct_fixpt_params rtwdemo_lct_fixpt_params> % shows integration with the legacy % code. The subsystem TestFixpt serves as a harness for the call to the % legacy C function via the generated S-function. open_system('rtwdemo_lct_fixpt_params') open_system('rtwdemo_lct_fixpt_params/TestFixpt') sim('rtwdemo_lct_fixpt_params')