MATLAB: How to generate zero initialization code which does not use the memset standard library function Real-Time Workshop Embedded Coder 5.3 (R2009a)

Question

I woud like to generate zero initialization code which does not use memset standard library function in the Real-Time Workshop Embedded Coder.

Answer 1

Target Function Library feature can replace memset function with the user original function.

Below is an example with the 'memcopy' function obtained by opening the HELP documentation for the Real-Time Workshop Embedded Coder.

In the documentation in the Contents section -> Click on Real-Time Workshop Embedded Coder -> Target Function Libraries -> Creating Function Replacement Tables -> Example: Mapping the memcpy Function to a Target-Specific Implementation

http://www.mathworks.com/help/releases/R2009a/toolbox/ecoder/index.html?/help/releases/R2009a/toolbox/ecoder

Here, in the memset case, you should change 'key' parameter 'memcopy' in the setTflCFunctionEntryParameters API function.

Also, the in the 'Real-time Workshop' -> 'Custom Code' -> 'Include list of additional' :

 Include directories : <Include the directory path which has the Header file, i.e., say my_string.h>
 Source File : <Include the file path, i.e., say my_string.c>

1. Create and save the following memset_tfl.m on your MATLAB path

function hTable = memset_tfl
hTable = RTW.TflTable;
% void* memset( void*, int, size_t )
fcn_entry = RTW.TflCFunctionEntry;
setTflCFunctionEntryParameters(fcn_entry, ...
                                    'Key',                      'memset', ...
                                    'Priority',                 90, ...
                                    'ImplementationName',       'my_memset', ...
                                    'ImplementationHeaderFile', 'my_string.h', ...
                                    'ImplementationSourceFile', 'my_string.c', ...
                                    'SideEffects',          true);
arg = getTflArgFromString(hTable, 'y1', 'void*');
arg.IOType = 'RTW_IO_OUTPUT';
addConceptualArg(fcn_entry, arg);
arg = getTflArgFromString(hTable, 'u1', 'void*');
addConceptualArg(fcn_entry, arg);
arg = getTflArgFromString(hTable, 'u2', 'integer');
addConceptualArg(fcn_entry, arg);
arg = getTflArgFromString(hTable, 'u3', 'size_t');
addConceptualArg(fcn_entry, arg);
copyConceptualArgsToImplementation(fcn_entry);
addEntry( hTable, fcn_entry );
%EOF

2. Next, create and save sl_customization.m (example is ANSI) on your MATLAB path

function sl_customization(cm)
% sl_customization function to register a target function library (TFL)
    % Register the TFL defined in local function locTflRegFcn
    cm.registerTargetInfo(@locTflRegFcn);
end % End of SL_CUSTOMIZATION
% Local function to define a TFL containing tfl_table_memcpy
function thisTfl = locTflRegFcn
    % Instantiate a TFL registry entry
    thisTfl = RTW.TflRegistry;
    % Define the TFL properties
    thisTfl.Name = 'Memset Function Example'; 
    thisTfl.Description = 'Demonstration of memcpy function replacement';
    thisTfl.TableList = {'memset_tfl'};
    thisTfl.BaseTfl = 'C89/C90 (ANSI)';
    thisTfl.TargetHWDeviceType = {'*'};
end % End of LOCTFLREGFCN

3. Execute sl_refresh_customizations in the MATLAB command window.

4. Open your model and Select ”Memset Function Example” for Target Function Library in the configuration paramters （Real-Time Workshop/interface）

5. Generate Code