Function rt_dma_chan_config

components/drivers/dma/dma.c:146–206

}

rt_err_t rt_dma_chan_config(struct rt_dma_chan *chan,
        struct rt_dma_slave_config *conf)
{
    rt_err_t err;
    struct rt_dma_controller *ctrl;
    enum rt_dma_transfer_direction dir;

    if (!chan || !conf)
    {
        err = -RT_EINVAL;
        goto _end;
    }

    dir = conf->direction;

    if (dir >= RT_DMA_DIR_MAX)
    {
        err = -RT_EINVAL;
        goto _end;
    }

    if (conf->src_addr_width >= RT_DMA_SLAVE_BUSWIDTH_BYTES_MAX ||
        conf->dst_addr_width >= RT_DMA_SLAVE_BUSWIDTH_BYTES_MAX)
    {
        err = -RT_EINVAL;
        goto _end;
    }

    ctrl = chan->ctrl;

    if (!rt_bitmap_test_bit(ctrl->dir_cap, dir))
    {
        err = -RT_ENOSYS;
        goto _end;
    }

    if (!chan->name && dir != RT_DMA_MEM_TO_MEM)
    {
        LOG_E("%s: illegal config for uname channels",
                rt_dm_dev_get_name(ctrl->dev));

        err = -RT_EINVAL;
        goto _end;
    }

    rt_mutex_take(&ctrl->mutex, RT_WAITING_FOREVER);

    err = ctrl->ops->config(chan, conf);

    rt_mutex_release(&ctrl->mutex);

    if (!err)
    {
        rt_memcpy(&chan->conf, conf, sizeof(*conf));
    }

_end:
    chan->conf_err = err;