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Richard Barry 2012-08-11 21:34:11 +00:00
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FreeRTOS/Demo/CORTEX_A2F200_SoftConsole/uIP_Task.c Normal file
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/*
FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
***************************************************************************
* *
* FreeRTOS tutorial books are available in pdf and paperback. *
* Complete, revised, and edited pdf reference manuals are also *
* available. *
* *
* Purchasing FreeRTOS documentation will not only help you, by *
* ensuring you get running as quickly as possible and with an *
* in-depth knowledge of how to use FreeRTOS, it will also help *
* the FreeRTOS project to continue with its mission of providing *
* professional grade, cross platform, de facto standard solutions *
* for microcontrollers - completely free of charge! *
* *
* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
* *
* Thank you for using FreeRTOS, and thank you for your support! *
* *
***************************************************************************
This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
>>>NOTE<<< The modification to the GPL is included to allow you to
distribute a combined work that includes FreeRTOS without being obliged to
provide the source code for proprietary components outside of the FreeRTOS
kernel. FreeRTOS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details. You should have received a copy of the GNU General Public
License and the FreeRTOS license exception along with FreeRTOS; if not it
can be viewed here: http://www.freertos.org/a00114.html and also obtained
by writing to Richard Barry, contact details for whom are available on the
FreeRTOS WEB site.
1 tab == 4 spaces!
***************************************************************************
* *
* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong? *
* *
* http://www.FreeRTOS.org/FAQHelp.html *
* *
***************************************************************************
http://www.FreeRTOS.org - Documentation, training, latest information,
license and contact details.
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool.
Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
the code with commercial support, indemnification, and middleware, under
the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
provide a safety engineered and independently SIL3 certified version under
the SafeRTOS brand: http://www.SafeRTOS.com.
*/
/* Standard includes. */
#include <string.h>
/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "timers.h"
/* uip includes. */
#include "net/uip.h"
#include "net/uip_arp.h"
#include "apps/httpd/httpd.h"
#include "sys/timer.h"
#include "net/clock-arch.h"
/* Demo includes. */
#include "ParTest.h"
/* Hardware driver includes. */
#include "mss_ethernet_mac_regs.h"
#include "mss_ethernet_mac.h"
/* The buffer used by the uIP stack to both receive and send. In this case,
because the Ethernet driver has been modified to be zero copy - the uip_buf
variable is just a pointer to an Ethernet buffer, and not a buffer in its own
right. */
extern unsigned char *uip_buf;
/* The ARP timer and the periodic timer share a callback function, so the
respective timer IDs are used to determine which timer actually expired. These
constants are assigned to the timer IDs. */
#define uipARP_TIMER 0
#define uipPERIODIC_TIMER 1
/* The length of the queue used to send events from timers or the Ethernet
driver to the uIP stack. */
#define uipEVENT_QUEUE_LENGTH 10
/* A block time of zero simply means "don't block". */
#define uipDONT_BLOCK 0UL
/* How long to wait before attempting to connect the MAC again. */
#define uipINIT_WAIT ( 100 / portTICK_RATE_MS )
/* Shortcut to the header within the Rx buffer. */
#define xHeader ((struct uip_eth_hdr *) &uip_buf[ 0 ])
/* Standard constant. */
#define uipTOTAL_FRAME_HEADER_SIZE 54
/*-----------------------------------------------------------*/
/*
* Setup the MAC address in the MAC itself, and in the uIP stack.
*/
static void prvSetMACAddress( void );
/*
* Perform any uIP initialisation required to ready the stack for http
* processing.
*/
static void prvInitialise_uIP( void );
/*
* Handles Ethernet interrupt events.
*/
static void prvEMACEventListener( unsigned long ulISREvents );
/*
* The callback function that is assigned to both the periodic timer and the
* ARP timer.
*/
static void prvUIPTimerCallback( xTimerHandle xTimer );
/*
* Initialise the MAC hardware.
*/
static void prvInitEmac( void );
/*
* Write data to the Ethener. Note that this actually writes data twice for the
* to get around delayed ack issues when communicating with a non real-time
* peer (for example, a Windows machine).
*/
void vEMACWrite( void );
/*
* Port functions required by the uIP stack.
*/
clock_time_t clock_time( void );
/*-----------------------------------------------------------*/
/* The queue used to send TCP/IP events to the uIP stack. */
xQueueHandle xEMACEventQueue = NULL;
/*-----------------------------------------------------------*/
clock_time_t clock_time( void )
{
return xTaskGetTickCount();
}
/*-----------------------------------------------------------*/
void vuIP_Task( void *pvParameters )
{
portBASE_TYPE i;
unsigned long ulNewEvent = 0UL, ulUIP_Events = 0UL;
long lPacketLength;
/* Just to prevent compiler warnings about the unused parameter. */
( void ) pvParameters;
/* Initialise the uIP stack, configuring for web server usage. */
prvInitialise_uIP();
/* Initialise the MAC and PHY. */
prvInitEmac();
for( ;; )
{
/* Is there received data ready to be processed? */
lPacketLength = MSS_MAC_rx_packet();
/* Statements to be executed if data has been received on the Ethernet. */
if( ( lPacketLength > 0 ) && ( uip_buf != NULL ) )
{
uip_len = ( u16_t ) lPacketLength;
/* Standard uIP loop taken from the uIP manual. */
if( xHeader->type == htons( UIP_ETHTYPE_IP ) )
{
uip_arp_ipin();
uip_input();
/* If the above function invocation resulted in data that
should be sent out on the network, the global variable
uip_len is set to a value > 0. */
if( uip_len > 0 )
{
uip_arp_out();
vEMACWrite();
}
}
else if( xHeader->type == htons( UIP_ETHTYPE_ARP ) )
{
uip_arp_arpin();
/* If the above function invocation resulted in data that
should be sent out on the network, the global variable
uip_len is set to a value > 0. */
if( uip_len > 0 )
{
vEMACWrite();
}
}
}
else
{
/* Clear the RX event latched in ulUIP_Events - if one was latched. */
ulUIP_Events &= ~uipETHERNET_RX_EVENT;
}
/* Statements to be executed if the TCP/IP period timer has expired. */
if( ( ulUIP_Events & uipPERIODIC_TIMER_EVENT ) != 0UL )
{
ulUIP_Events &= ~uipPERIODIC_TIMER_EVENT;
if( uip_buf != NULL )
{
for( i = 0; i < UIP_CONNS; i++ )
{
uip_periodic( i );
/* If the above function invocation resulted in data that
should be sent out on the network, the global variable
uip_len is set to a value > 0. */
if( uip_len > 0 )
{
uip_arp_out();
vEMACWrite();
}
}
}
}
/* Statements to be executed if the ARP timer has expired. */
if( ( ulUIP_Events & uipARP_TIMER_EVENT ) != 0 )
{
ulUIP_Events &= ~uipARP_TIMER_EVENT;
uip_arp_timer();
}
/* If all latched events have been cleared - block until another event
occurs. */
if( ulUIP_Events == pdFALSE )
{
xQueueReceive( xEMACEventQueue, &ulNewEvent, portMAX_DELAY );
ulUIP_Events |= ulNewEvent;
}
}
}
/*-----------------------------------------------------------*/
static void prvSetMACAddress( void )
{
struct uip_eth_addr xAddr;
/* Configure the MAC address in the uIP stack. */
xAddr.addr[ 0 ] = configMAC_ADDR0;
xAddr.addr[ 1 ] = configMAC_ADDR1;
xAddr.addr[ 2 ] = configMAC_ADDR2;
xAddr.addr[ 3 ] = configMAC_ADDR3;
xAddr.addr[ 4 ] = configMAC_ADDR4;
xAddr.addr[ 5 ] = configMAC_ADDR5;
uip_setethaddr( xAddr );
}
/*-----------------------------------------------------------*/
static void prvInitialise_uIP( void )
{
uip_ipaddr_t xIPAddr;
xTimerHandle xARPTimer, xPeriodicTimer;
uip_init();
uip_ipaddr( &xIPAddr, configIP_ADDR0, configIP_ADDR1, configIP_ADDR2, configIP_ADDR3 );
uip_sethostaddr( &xIPAddr );
uip_ipaddr( &xIPAddr, configNET_MASK0, configNET_MASK1, configNET_MASK2, configNET_MASK3 );
uip_setnetmask( &xIPAddr );
prvSetMACAddress();
httpd_init();
/* Create the queue used to sent TCP/IP events to the uIP stack. */
xEMACEventQueue = xQueueCreate( uipEVENT_QUEUE_LENGTH, sizeof( unsigned long ) );
/* Create and start the uIP timers. */
xARPTimer = xTimerCreate( ( signed char * ) "ARPTimer", /* Just a name that is helpful for debugging, not used by the kernel. */
( 10000UL / portTICK_RATE_MS ), /* Timer period. */
pdTRUE, /* Autor-reload. */
( void * ) uipARP_TIMER,
prvUIPTimerCallback
);
xPeriodicTimer = xTimerCreate( ( signed char * ) "PeriodicTimer",
( 500UL / portTICK_RATE_MS ),
pdTRUE, /* Autor-reload. */
( void * ) uipPERIODIC_TIMER,
prvUIPTimerCallback
);
/* Sanity check that the timers were indeed created. */
configASSERT( xARPTimer );
configASSERT( xPeriodicTimer );
/* These commands will block indefinitely until they succeed, so there is
no point in checking their return values. */
xTimerStart( xARPTimer, portMAX_DELAY );
xTimerStart( xPeriodicTimer, portMAX_DELAY );
}
/*-----------------------------------------------------------*/
static void prvEMACEventListener( unsigned long ulISREvents )
{
long lHigherPriorityTaskWoken = pdFALSE;
const unsigned long ulRxEvent = uipETHERNET_RX_EVENT;
/* Sanity check that the event queue was indeed created. */
configASSERT( xEMACEventQueue );
if( ( ulISREvents & MSS_MAC_EVENT_PACKET_SEND ) != 0UL )
{
/* An Ethernet Tx event has occurred. */
MSS_MAC_FreeTxBuffers();
}
if( ( ulISREvents & MSS_MAC_EVENT_PACKET_RECEIVED ) != 0UL )
{
/* An Ethernet Rx event has occurred. */
xQueueSendFromISR( xEMACEventQueue, &ulRxEvent, &lHigherPriorityTaskWoken );
}
portEND_SWITCHING_ISR( lHigherPriorityTaskWoken );
}
/*-----------------------------------------------------------*/
static void prvInitEmac( void )
{
const unsigned char ucPHYAddress = 1;
/* Initialise the MAC and PHY hardware. */
MSS_MAC_init( ucPHYAddress );
/* Register the event listener. The Ethernet interrupt handler will call
this listener whenever an Rx or a Tx interrupt occurs. */
MSS_MAC_set_callback( ( MSS_MAC_callback_t ) prvEMACEventListener );
/* Setup the EMAC and the NVIC for MAC interrupts. */
NVIC_SetPriority( EthernetMAC_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
NVIC_EnableIRQ( EthernetMAC_IRQn );
}
/*-----------------------------------------------------------*/
void vEMACWrite( void )
{
const long lMaxAttempts = 10;
long lAttempt;
const portTickType xShortDelay = ( 5 / portTICK_RATE_MS );
/* Try to send data to the Ethernet. Keep trying for a while if data cannot
be sent immediately. Note that this will actually cause the data to be sent
twice to get around delayed ACK problems when communicating with non real-
time TCP/IP stacks (such as a Windows machine). */
for( lAttempt = 0; lAttempt < lMaxAttempts; lAttempt++ )
{
if( MSS_MAC_tx_packet( uip_len ) != 0 )
{
break;
}
else
{
vTaskDelay( xShortDelay );
}
}
}
/*-----------------------------------------------------------*/
static void prvUIPTimerCallback( xTimerHandle xTimer )
{
static const unsigned long ulARPTimerExpired = uipARP_TIMER_EVENT;
static const unsigned long ulPeriodicTimerExpired = uipPERIODIC_TIMER_EVENT;
/* This is a time callback, so calls to xQueueSend() must not attempt to
block. As this callback is assigned to both the ARP and Periodic timers, the
first thing to do is ascertain which timer it was that actually expired. */
switch( ( int ) pvTimerGetTimerID( xTimer ) )
{
case uipARP_TIMER : xQueueSend( xEMACEventQueue, &ulARPTimerExpired, uipDONT_BLOCK );
break;
case uipPERIODIC_TIMER : xQueueSend( xEMACEventQueue, &ulPeriodicTimerExpired, uipDONT_BLOCK );
break;
default : /* Should not get here. */
break;
}
}
/*-----------------------------------------------------------*/
void vApplicationProcessFormInput( char *pcInputString )
{
char *c;
/* Only interested in processing form input if this is the IO page. */
c = strstr( pcInputString, "io.shtml" );
if( c )
{
/* Is there a command in the string? */
c = strstr( pcInputString, "?" );
if( c )
{
/* Turn the LED's on or off in accordance with the check box status. */
if( strstr( c, "LED0=1" ) != NULL )
{
/* Turn the LEDs on. */
vParTestSetLED( 3, 1 );
vParTestSetLED( 4, 1 );
}
else
{
/* Turn the LEDs off. */
vParTestSetLED( 3, 0 );
vParTestSetLED( 4, 0 );
}
}
else
{
/* Commands to turn LEDs off are not always explicit. */
vParTestSetLED( 3, 0 );
vParTestSetLED( 4, 0 );
}
}
}
/*-----------------------------------------------------------*/