CODEWITHSUNDEEP
cstructstaticembedded
Marcusnh
Marcusnh

Reputation: 43

c embedded: static struct initialization with defined struct variable name

Creating this struct:

typedef enum {

  IDLE = 0,

  SENT  = 1,

  RECEPTION     = 2,

  DONE          = 3,

  ABORT               = 4,

} State_t;



typedef struct {

    State_t state;

    u8 N;

    u8 last;

    u16 time;

}__attribute__((packed)) Context_t;

Want to initialize it with struct variable names. This gives me an error:

static Context_t arr[MAX_CONTEXT] = {
    
            .state = IDLE, .N= 1, .last= 0, .time= 0
    
        };

as well as this:

  static Context_t arr[MAX_CONTEXT];

    arr = {

        .state = IDLE, .N= 1, .last= 0, .time= 0

    };

This of course work, but is not what i want:

static Context_t arr[MAX_CONTEXT] = {
    
            IDLE, 1,  0, 0
    
        };

Does anybody have a better way of implementing this struct?

Upvotes: 0

Views: 450

Answers (2)

Lundin
Lundin

Reputation: 213950

You get errors because it usually doesn't make sense to initialize an array of struct with a single struct item's initializers.

If your intention is to only initialize the first item in the array, then it should be:

static Context_t arr [MAX_CONTEXT] = 
{
  { .state = IDLE, .N= 1, .last= 0, .time= 0 },
};

or if you will: [0] = { .state = IDLE, .N= 1, .last= 0, .time= 0 },

Upvotes: 3

badbouille
badbouille

Reputation: 46

Depends on the compiler but try this one out maybe:

    static Context_t arr[MAX_CONTEXT] = {
        {.state=IDLE, .N=1, .last=0, .time=0}, // 0
        {.state=IDLE, .N=1, .last=0, .time=0}, // 1
        ...
        {.state=IDLE, .N=1, .last=0, .time=0}  // MAX_CONTENT
    };

Upvotes: 0

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