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jeremybenn |
/*
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* Modified from an original work that is Copyright (c) 2001-2003, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack.
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*
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* $Id: uIP_Task.c 2 2011-07-17 20:13:17Z filepang@gmail.com $
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*
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*/
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/* Standard includes. */
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#include <stdlib.h>
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#include <stdio.h>
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "semphr.h"
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#include "task.h"
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/* Demo app includes. */
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#include "SAM7_EMAC.h"
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/* uIP includes. */
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#undef HTONS
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#include "uip.h"
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#include "uip_arp.h"
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#include "tapdev.h"
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#include "httpd.h"
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/* The start of the uIP buffer, which will contain the frame headers. */
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#define pucUIP_Buffer ( ( struct uip_eth_hdr * ) &uip_buf[ 0 ] )
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/* uIP update frequencies. */
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#define RT_CLOCK_SECOND ( configTICK_RATE_HZ )
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#define uipARP_FREQUENCY ( 20 )
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#define uipMAX_BLOCK_TIME ( RT_CLOCK_SECOND / 4 )
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/*-----------------------------------------------------------*/
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void vuIP_TASK( void *pvParameters )
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{
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/* The semaphore used by the EMAC ISR to indicate that an Rx frame is ready
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for processing. */
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xSemaphoreHandle xSemaphore = NULL;
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portBASE_TYPE xARPTimer;
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unsigned portBASE_TYPE uxPriority;
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static volatile portTickType xStartTime, xCurrentTime;
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/* Initialize the uIP TCP/IP stack. */
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uip_init();
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uip_arp_init();
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/* Initialize the HTTP server. */
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httpd_init();
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/* Initialise the local timers. */
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xStartTime = xTaskGetTickCount();
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xARPTimer = 0;
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/* Initialise the EMAC. A semaphore will be returned when this is
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successful. This routine contains code that polls status bits. If the
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Ethernet cable is not plugged in then this can take a considerable time.
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To prevent this starving lower priority tasks of processing time we
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lower our priority prior to the call, then raise it back again once the
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initialisation is complete. */
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uxPriority = uxTaskPriorityGet( NULL );
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vTaskPrioritySet( NULL, tskIDLE_PRIORITY );
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while( xSemaphore == NULL )
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{
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xSemaphore = xEMACInit();
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}
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vTaskPrioritySet( NULL, uxPriority );
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for( ;; )
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{
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/* Let the network device driver read an entire IP packet
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into the uip_buf. If it returns > 0, there is a packet in the
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uip_buf buffer. */
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uip_len = ulEMACPoll();
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/* Was a packet placed in the uIP buffer? */
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if( uip_len > 0 )
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{
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/* A packet is present in the uIP buffer. We call the
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appropriate ARP functions depending on what kind of packet we
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have received. If the packet is an IP packet, we should call
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uip_input() as well. */
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if( pucUIP_Buffer->type == htons( UIP_ETHTYPE_IP ) )
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{
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uip_arp_ipin();
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uip_input();
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/* If the above function invocation resulted in data that
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should be sent out on the network, the global variable
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uip_len is set to a value > 0. */
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if( uip_len > 0 )
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{
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uip_arp_out();
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lEMACSend();
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}
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}
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else if( pucUIP_Buffer->type == htons( UIP_ETHTYPE_ARP ) )
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{
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uip_arp_arpin();
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/* If the above function invocation resulted in data that
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should be sent out on the network, the global variable
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uip_len is set to a value > 0. */
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if( uip_len > 0 )
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{
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lEMACSend();
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}
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}
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}
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else
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{
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/* The poll function returned 0, so no packet was
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received. Instead we check if it is time that we do the
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periodic processing. */
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xCurrentTime = xTaskGetTickCount();
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if( ( xCurrentTime - xStartTime ) >= RT_CLOCK_SECOND )
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{
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portBASE_TYPE i;
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/* Reset the timer. */
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xStartTime = xCurrentTime;
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/* Periodic check of all connections. */
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for( i = 0; i < UIP_CONNS; i++ )
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{
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uip_periodic( i );
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/* If the above function invocation resulted in data that
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should be sent out on the network, the global variable
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uip_len is set to a value > 0. */
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if( uip_len > 0 )
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{
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uip_arp_out();
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lEMACSend();
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}
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}
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#if UIP_UDP
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for( i = 0; i < UIP_UDP_CONNS; i++ )
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{
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uip_udp_periodic( i );
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/* If the above function invocation resulted in data that
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should be sent out on the network, the global variable
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uip_len is set to a value > 0. */
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if( uip_len > 0 )
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{
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uip_arp_out();
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tapdev_send();
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}
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}
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#endif /* UIP_UDP */
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/* Periodically call the ARP timer function. */
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if( ++xARPTimer == uipARP_FREQUENCY )
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{
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uip_arp_timer();
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xARPTimer = 0;
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}
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}
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else
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{
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/* We did not receive a packet, and there was no periodic
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processing to perform. Block for a fixed period. If a packet
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is received during this period we will be woken by the ISR
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giving us the Semaphore. */
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xSemaphoreTake( xSemaphore, uipMAX_BLOCK_TIME );
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}
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}
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}
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}
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/*-----------------------------------------------------------------------------------*/
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