Struct arduino

Projects Programming
1

Helo Im tryng to implemente struct, but I got a error, so I created a test file.

struct tes{
  char a;
  char b;
};
typedef struct tes TES;
struct te{
  char t;
  static  TES e;
  //static struct TES s;
};

typedef struct te tte;
void setup(){
//memset( &Ste, 0x00, sizeof(struct te) ); 

//static struct te Ste;
}

void loop()
{
tte SSte;
if (SSte.e.a) 
{
delay(10);
}
}

and I get the error:

test_struct.cpp.o: In function loop': C:\Users\*\Downloads\arduino-nightly/test_struct.ino:22: undefined reference to te::e'

2

Try removing the static keyword from the struct definition.

3

You could also try this:

typedef struct {
  char a;
  char b;
} tes;

typedef struct {
  char t;
  tes e;
} tte;

void setup(){

}

void loop()
{
  tte SSte = {0,{1,0}}; //Initialise the new variable - I think this may be a gcc extension?
  if (SSte.e.a) 
  {
    delay(10);
  }
}
4

I don't think you can have a static element in a struct. It would defeat the purpose of being able to memset and memcpy the entire struct which is assumed to be contiguous bytes.

If you wanted to have a static shared component of part of the structs data, you could put the common data in a struct and then have an element of all of the other structs which is a pointer to that data.

5 
#include <string.h> 
#include <avr/io.h> 

typedef struct { 
  char a; 
  char b; 
} Ntes; 

typedef struct { 
  char t; 
  Ntes e; 
  Ntes s; 
} tte; 

static tte Ste; 

void setup(){ 
  memset( &Ste, 0x00, sizeof(tte) ); 
} 

int main(void) { 
  setup(); 
  if (Ste.e.a) 
  { 
    PORTB = 0xFF; 
  } 
}

some guy at avr freak answered this question.