Function rt_pic_cascade

components/drivers/pic/pic.c:291–327

}

rt_err_t rt_pic_cascade(struct rt_pic_irq *pirq, int parent_irq)
{
    rt_err_t err = RT_EOK;

    if (pirq && !pirq->parent && parent_irq >= 0)
    {
        struct rt_pic_irq *parent;

        rt_spin_lock(&pirq->rw_lock);

        parent = irq2pirq(parent_irq);

        if (parent)
        {
            pirq->parent = parent;
            pirq->priority = parent->priority;
            rt_memcpy(&pirq->affinity, &parent->affinity, sizeof(pirq->affinity));
        }

        rt_spin_unlock(&pirq->rw_lock);

        if (parent && pirq->pic->ops->flags & RT_PIC_F_IRQ_ROUTING)
        {
            rt_spin_lock(&parent->rw_lock);

            rt_list_insert_before(&parent->children_nodes, &pirq->list);

            rt_spin_unlock(&parent->rw_lock);
        }
    }
    else
    {
        err = -RT_EINVAL;
    }

    return err;
}

rt_err_t rt_pic_uncascade(struct rt_pic_irq *pirq)
{