Writing Maltab code for code generation when using structures and custom data types

Hi all,

I am currently trouble with embedded coder. I would like to generate a C header file that looks a bit like this: foo.h

ifndef _foo_INCLUDED
#define _foo_INCLUDED

#include "custom_types.h"

typedef struct fooDef
{
custom_uint32_t variable1;
custom_float32_t variable2;
}fooStr;

...

extern void fooSet(fooStr *paramPtr);
extern void fooReset(fooStr *paramPtr);
...

Similarly the source file will look like: foo.c

#include "custom_types.h"
#include "foo.h"

...
void fooSet(fooStr *paramPtr)
{
paramPtr->variable1 = 30;
paramPtr->variable2 = 5.0;
}

void fooReset(fooStr *paramPtr)
{
}
...

However I am not sure how to write (/architect) my Matlab code to produce this result. I am using coder.opaque and coder.cstructname.

variable1 = coder.opaque('custom_uint32_t', '0', 'HeaderFile', '"custom_types.h"');
variable2 = coder.opaque('custom_float32_t', '0.0', 'HeaderFile', '"custom_types.h"');

fooStr = struct(  'variable1', uint32(zeros(1,1)),...
                  'variable2', single(zeros(1,1)));

coder.cstructname(fooStr, 'fooStr');

Could someone comment or link to a guide please?

I am not sure if I need a number of Matlab functions and how to split them up.

I suppose I need more than one Matlab function to produce this result but can't tell how.

I thought it would be relatively straitforward but it's troubling me and looking for some online guide for help. Any help much appreciated.

Thanks Alex

Answer 1

[Mordechai Rorvig]

You were close here, but you cannot set or access variables that you declare with coder.opaque. Use coder.opaque for passing variables in and out of coder.ceval (external C function) calls.

What you can do is define something like the following:

function [myfooStr] = foo
x = struct('p',int32(0));
coder.cstructname(x,'custom_uint32_t');
y = struct('p', single(0));
coder.cstructname(y,'custom_float32_t');
myfooStr.variable1 = x;
myfooStr.variable2 = y;
coder.cstructname(myfooStr,'fooStr');

Then, you find the type definition as expected in the generated file, foo_types.h:

typedef struct {
  custom_uint32_t variable1;
  custom_float32_t variable2;
} fooStr;