MATLAB APPLICATION DEPLOYMENT - WEB EXAMPLE GUIDE Uživatelská příručka stáhnout pdf (Strana 93)

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101

Interfacing M-Co de to C/C++ Code

Inter facing M -Code to C/C++ Code

In this section...

“Overview” on page 5-13

“C Ex ample” on page 5-13

Overview

MATLAB Compiler supports calling arbitrary C/C++ functions from your

M-code. You simply provide an M-function stub that determines how the code

will be have in M, and then provide an implementation of the body of the

function in C or C++.

CExample

Suppose you have a C function that reads data from a measurement

device. In M-code, you want to simulate the device by providing a sine

wave output. In production, you want to provide a function that returns

the meas urement obtained from the device. You have a C function called

measure_from_device() that returns a double, which is the current

measurement.

collect.m containstheM-codeforthesimulation of your application.

function collect

y = zeros(1, 100); %Preallocate the matrix

for i = 1:100

y(i) = collect_one;

end

disp (y)

function y = collect_one

persistent t;

if (isempty(t))

t=0;

end

5-13

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