Function rt_dm_device_find

components/drivers/core/dm.c:146–185

* @brief This function will return the specified master id and device id of device. * * @param master_id is the master id (0, 255] of device * * @param device_id is the device id [-1, 255] of device, when device_id is -1, * the function will end when find the first device. * * @return the device object or RT_NULL */

 * @return the device object or RT_NULL
 */
rt_device_t rt_dm_device_find(int master_id, int device_id)
{
    struct rt_device *dev, *ret_dev = RT_NULL;
    struct rt_object_information *information = RT_NULL;

    if (master_id <= 0 || device_id > 255)
    {
        return RT_NULL;
    }

    information = rt_object_get_information(RT_Object_Class_Device);

    /* parameter check */
    if (!information)
    {
        return RT_NULL;
    }

    /* which is invoke in interrupt status */
    RT_DEBUG_NOT_IN_INTERRUPT;

    /* enter critical */
    rt_enter_critical();

    /* try to find object */
    rt_list_for_each_entry(dev, &information->object_list, parent.list)
    {
        if (master_id == dev->master_id &&
            (device_id == -1 || device_id == dev->device_id))
        {
            ret_dev = dev;
            break;
        }
    }

    /* leave critical */
    rt_exit_critical();

    return ret_dev;
}

struct prefix_track
{