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