The setupImpl
and stepImpl
methods
hook the C/C++ functions to the System
object™. See Write the Hardware-Specific C/C++ Codefor
more information on creating C/C++ device driver code. The initialization
of a digital pin as output needs to be done only once at model initialization.
Hence, the digitalIOSetup
function is called in setupImpl
.
To update the logic state of the digital output pin, a call to writeDigitalPin
is
made from stepImpl
method. Nothing needs to be done
at termination. Follow these steps to update the initialization, output,
and termination code sections of the DigitalWrite
System
object you
created in Select a System Object Template.
In the MATLAB® editor, open DigitalWrite.m
class
file.
Update the setupImpl
method using
the following code.
methods (Access=protected) function setupImpl(obj) %#ok<MANU> if isempty(coder.target) % Place simulation setup code here else % Call C-function implementing device initialization coder.cinclude('digitalio_arduino.h'); coder.ceval('digitalIOSetup', 9, 1); end end ... end
The coder.ceval
function executes calls
to the C wrapper functions in digitalio_arduino.h
.
The second and third arguments of coder.ceval
are
the Arduino® hardware pin number and pin mode values, respectively.
Update the BuildInfo
method using
the following code.
methods (Static) ... function updateBuildInfo(buildInfo, context) if context.isCodeGenTarget('rtw') % Update buildInfo srcDir = fullfile(fileparts(mfilename('fullpath')),'src'); %#ok includeDir = fullfile(fileparts(mfilename('fullpath')),'include'); addIncludePaths(buildInfo,includeDir); % Use the following API's to add include files, sources and linker flags addSourceFiles(buildInfo,'digitalio_arduino.cpp', srcDir); end end ... end
Update the stepImpl
method with the
following code.
methods(Access=protected) ... function stepImpl(obj,u) %#ok<INUSD> if isempty(coder.target) % Place simulation setup code here else % Call C-function implementing device output coder.ceval('writeDigitalPin', 9, u); end end ... end
Update the releaseImpl
method with
the following code.
methods(Access=protected) ... function releaseImpl(obj) %#ok<MANU> if isempty(coder.target) % Place simulation termination code here else % Call C-function implementing device termination % No termination code for Arduino end end ... end
In the next section, you will Test System Object on MATLAB Command Line.
Create a Digital Write Block | Select a System Object Template | Test System Object on MATLAB Command Line