89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/****************************************************************************
|
|
* net/can/can_poll.c
|
|
* Poll for the availability of packet TX data
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#if defined(CONFIG_NET) && defined(CONFIG_NET_CAN)
|
|
|
|
#include <assert.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/net/netconfig.h>
|
|
#include <nuttx/net/netdev.h>
|
|
|
|
#include "devif/devif.h"
|
|
#include "can/can.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: can_poll
|
|
*
|
|
* Description:
|
|
* Poll a packet "connection" structure for availability of TX data
|
|
*
|
|
* Input Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
* conn - The packet "connection" to poll for TX data
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* The network is locked.
|
|
* dev is not NULL.
|
|
* conn is not NULL.
|
|
* The connection (conn) is bound to the polling device (dev).
|
|
*
|
|
****************************************************************************/
|
|
|
|
void can_poll(FAR struct net_driver_s *dev, FAR struct can_conn_s *conn)
|
|
{
|
|
DEBUGASSERT(dev != NULL && conn != NULL && dev == conn->dev);
|
|
|
|
/* Setup for the application callback */
|
|
|
|
dev->d_len = 0;
|
|
dev->d_sndlen = 0;
|
|
|
|
/* Perform the application callback */
|
|
|
|
can_callback(dev, conn, CAN_POLL);
|
|
|
|
/* Check if the application has data to send */
|
|
|
|
if (dev->d_sndlen > 0)
|
|
{
|
|
return;
|
|
}
|
|
|
|
/* Make sure that d_len is zero meaning that there is nothing to be sent */
|
|
|
|
dev->d_len = 0;
|
|
}
|
|
|
|
#endif /* CONFIG_NET && CONFIG_NET_CAN */
|