用于使用结构体指针循环结构体成员

Question

I think my pointer game is rusty, I can't seem to get the for loop implementation to work. It's like the pointer isn't incremented along with the array. Any suggestions?

I implemented a "manual" version of what i want the loop to do. It worked as expected.

typedef struct txstruct_t
{
    uint8_t tx[8];
    void(*send)(struct txstruct_t *cthis, uint8_t arr[8]);

}txstruct_t;

void send(txstruct_t *cthis, uint8_t arr[8]);


void loop() 
{
    txstruct_t txobj;
    uint8_t buf[8] = { 1, 0, 1, 0, 1, 0, 1, 0 };
    send(&txobj, buf);

}

// This works
void send(txstruct_t *cthis, uint8_t arr[8])
{
    cthis->tx[0] = arr[0];
    cthis->tx[1] = arr[1];
    cthis->tx[2] = arr[2];
    cthis->tx[3] = arr[3];
    cthis->tx[4] = arr[4];
    cthis->tx[5] = arr[5];
    cthis->tx[6] = arr[6];
    cthis->tx[7] = arr[7];

    return;
};

/*
//This doesn't work :(
void send(txstruct_t *cthis, uint8_t arr[8])
{

    for (int i = 0; i < 8; i++)
    {
        cthis = cthis + i;
        cthis->tx[i] = arr[i];
    }

    return;
};*/

I would love some clarification on this, so I could learn how to avoid this in the future! Maybe even a better method of implementing such buffers.

Answer 1

cthis = cthis + i; can be removed. It makes no sense at all as it's an undefined attempt to somehow reset the pointer to the struct . You don't do that in the unrolled version of the loop, do you?

The other components of the loop are fine.