Kinetis K40 codewarrior structure problem

[mareklagger]

Hello,

I am using eclipse based codewarrior for mcu 10.1 and I cant use structures, what Iam doing wrong?

struct steering {

     int P;

};

steering left;

left.P=0;

typedef struct{

     int x;

     int y;

} new_struct;

new_struct.x=0;

In both examples I am getting declaration syntax error. It can make a structure but if I want to change its member I am getting declaration syntax error.

Thank You

[pgo]

Hi,

There are a couple of obvious problems.

You may be used to C++ which has some different rules to C.

Try:

struct steering {
   int P;
};

struct steering left;

left.P=0;

You need to repeat the keyword struct

in the declaration of the variable.

typedef struct
int x;
int yl
}new_struct;

new_struct.x = 0;

This is illegal for two reasons:

typedef struct does not create a variable but a type instead.

You also cannot have declarations after executable statements e.g.

int x;
x = 4;
int y;  /* Illegal */

bye

[mareklagger]

I tried it and the result is the same. Declaration and syntax error for both. It looks like there is something with compiler.

[carlos_neri]

Could you please try the following:

typedef struct{

     int x;

     int y;

} new_struct;

new_struct my_new_struct:

void foo (void)

{

my_new_struct.x=0;

}

[pgo · Accepted solution]

Hi Carlos,

Apart from the colon instead of a semi-colon, this compiles fine for me with CW10.1.

For reference - entire main.c:

#include <stdio.h>

#include "derivative.h" /* include peripheral declarations */

typedef struct {
     int x;
     int y;
} new_struct;

new_struct my_new_struct;

void main (void) {
   my_new_struct.x=0;
}

[mareklagger]

Thank you. The problem was that I didnt create the variable of struct type. But there was also some minor problem because I declared it in header. Now its working well

[carlos_neri]

Thanks for the feedback PGO.

Hopefully this will help Marek.