You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
4.5 KiB
126 lines
4.5 KiB
/**************************************************************************** |
|
* net/uip/uip_udppoll.c |
|
* Poll for the availability of UDP TX data |
|
* |
|
* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. |
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr> |
|
* |
|
* Adapted for NuttX from logic in uIP which also has a BSD-like license: |
|
* |
|
* Original author Adam Dunkels <adam@dunkels.com> |
|
* Copyright () 2001-2003, Adam Dunkels. |
|
* All rights reserved. |
|
* |
|
* Redistribution and use in source and binary forms, with or without |
|
* modification, are permitted provided that the following conditions |
|
* are met: |
|
* |
|
* 1. Redistributions of source code must retain the above copyright |
|
* notice, this list of conditions and the following disclaimer. |
|
* 2. Redistributions in binary form must reproduce the above copyright |
|
* notice, this list of conditions and the following disclaimer in the |
|
* documentation and/or other materials provided with the distribution. |
|
* 3. The name of the author may not be used to endorse or promote |
|
* products derived from this software without specific prior |
|
* written permission. |
|
* |
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
|
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
|
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
|
* |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Included Files |
|
****************************************************************************/ |
|
|
|
#include <nuttx/config.h> |
|
#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP) |
|
|
|
#include <debug.h> |
|
|
|
#include <nuttx/net/uip/uipopt.h> |
|
#include <nuttx/net/uip/uip.h> |
|
#include <nuttx/net/uip/uip-arch.h> |
|
|
|
#include "uip_internal.h" |
|
|
|
/**************************************************************************** |
|
* Pre-processor Definitions |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Public Variables |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Private Variables |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Private Functions |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Public Functions |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Name: uip_udppoll |
|
* |
|
* Description: |
|
* Poll a UDP "connection" structure for availability of TX data |
|
* |
|
* Parameters: |
|
* dev - The device driver structure to use in the send operation |
|
* conn - The UDP "connection" to poll for TX data |
|
* |
|
* Return: |
|
* None |
|
* |
|
* Assumptions: |
|
* Called from the interrupt level or with interrupts disabled. |
|
* |
|
****************************************************************************/ |
|
|
|
void uip_udppoll(struct uip_driver_s *dev, struct uip_udp_conn *conn) |
|
{ |
|
/* Verify that the UDP connection is valid */ |
|
|
|
if (conn->lport != 0) |
|
{ |
|
/* Setup for the application callback */ |
|
|
|
dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN]; |
|
dev->d_snddata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN]; |
|
|
|
dev->d_len = 0; |
|
dev->d_sndlen = 0; |
|
|
|
/* Perform the application callback */ |
|
|
|
uip_udpcallback(dev, conn, UIP_POLL); |
|
|
|
/* If the application has data to send, setup the UDP/IP header */ |
|
|
|
if (dev->d_sndlen > 0) |
|
{ |
|
uip_udpsend(dev, conn); |
|
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_UDP */
|
|
|