Generate Fixed-Point MATLAB Code for Multiple Entry-Point Functions

When your goal is to generate fixed-point C/C++ library functions, generating a single C/C++ library for more than one entry-point MATLAB^® function allows you to:

Create C/C++ libraries containing multiple, compiled MATLAB files to integrate with larger C/C++ applications. Generating C/C++ code requires a MATLAB Coder™ license.
Share code efficiently between library functions.
Communicate between library functions using shared memory.

Note

If any of the entry-point functions in a project share memory (for example, persistent data), an error will occur. In this case, you should rewrite your code to avoid invoking functions with persistent data from multiple entry-points.

Example 1. Convert Two Entry-Point Functions to Fixed-Point Using the Fixed-Point Converter App

In this example, you convert two entry-point functions, ep1 and ep2, to fixed point.

In a local writable folder, create the functions ep1.m and ep2.m.

function y = ep1(u) %#codegen
y = u;
end

function y = ep2(u, v) %#codegen
y = u + v;
end

In the same folder, create a test file, ep_tb.m, that calls both functions.
```
% test file for ep1 and ep2
u = 1:100;
v = 5:104;
z = ep1(u);
y = ep2(v,z);
```
At the command line, create a coder.FixPtConfig object, and specify the test bench as ep_tb.m.
```
fixptcfg = coder.config('fixpt');
>> fixptcfg.TestBenchName = 'ep_tb';
```
Generate fixed-point code using the fiaccel function. Include both entry-point functions ep1 and ep2.
```
fiaccel -float2fixed fixptcfg ep1 ep2
```
In the command window, click View Report to open the Code Generation Report Viewer. The report lists the generated fixed-point code and wrapper files for both entry-point functions.
By default, the conversion process uses the name of the first entry-point function as the name of the project. The generated files are stored in the subfolder codegen/ep1/fixpt.