typedef union {
         uint32_t p;
         float f;
} tUnion;

typedef struct {
         uint8_t type;
         uint8_t info[4];
         tUnion u;
} tItem;

const tItem i[] = {
         {2, {1,2,4,2}, .u.f=1.5},
         {1, {2,2,4,2}, .u.p=10},
         {2, {3,2,4,2}, .u.f=2.3}
};