2 FreeRTOS V7.3.0 - Copyright (C) 2012 Real Time Engineers Ltd.
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4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS tutorial books are available in pdf and paperback. *
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10 * Complete, revised, and edited pdf reference manuals are also *
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13 * Purchasing FreeRTOS documentation will not only help you, by *
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14 * ensuring you get running as quickly as possible and with an *
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15 * in-depth knowledge of how to use FreeRTOS, it will also help *
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16 * the FreeRTOS project to continue with its mission of providing *
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17 * professional grade, cross platform, de facto standard solutions *
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18 * for microcontrollers - completely free of charge! *
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20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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22 * Thank you for using FreeRTOS, and thank you for your support! *
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24 ***************************************************************************
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27 This file is part of the FreeRTOS distribution.
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29 FreeRTOS is free software; you can redistribute it and/or modify it under
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30 the terms of the GNU General Public License (version 2) as published by the
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31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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32 >>>NOTE<<< The modification to the GPL is included to allow you to
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33 distribute a combined work that includes FreeRTOS without being obliged to
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34 provide the source code for proprietary components outside of the FreeRTOS
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35 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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36 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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37 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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38 more details. You should have received a copy of the GNU General Public
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39 License and the FreeRTOS license exception along with FreeRTOS; if not it
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40 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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41 by writing to Richard Barry, contact details for whom are available on the
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46 ***************************************************************************
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48 * Having a problem? Start by reading the FAQ "My application does *
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49 * not run, what could be wrong?" *
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51 * http://www.FreeRTOS.org/FAQHelp.html *
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53 ***************************************************************************
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56 http://www.FreeRTOS.org - Documentation, training, latest versions, license
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57 and contact details.
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59 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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60 including FreeRTOS+Trace - an indispensable productivity tool.
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62 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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63 the code with commercial support, indemnification, and middleware, under
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64 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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65 provide a safety engineered and independently SIL3 certified version under
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66 the SafeRTOS brand: http://www.SafeRTOS.com.
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69 /* Standard includes. */
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72 /* Scheduler includes. */
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73 #include "FreeRTOS.h"
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79 #include "net/uip.h"
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80 #include "net/uip_arp.h"
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81 #include "apps/httpd/httpd.h"
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82 #include "sys/timer.h"
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83 #include "net/clock-arch.h"
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85 /* Demo includes. */
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86 #include "ParTest.h"
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88 /* Hardware driver includes. */
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89 #include "mss_ethernet_mac_regs.h"
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90 #include "mss_ethernet_mac.h"
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92 /* The buffer used by the uIP stack to both receive and send. In this case,
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93 because the Ethernet driver has been modified to be zero copy - the uip_buf
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94 variable is just a pointer to an Ethernet buffer, and not a buffer in its own
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96 extern unsigned char *uip_buf;
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98 /* The ARP timer and the periodic timer share a callback function, so the
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99 respective timer IDs are used to determine which timer actually expired. These
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100 constants are assigned to the timer IDs. */
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101 #define uipARP_TIMER 0
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102 #define uipPERIODIC_TIMER 1
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104 /* The length of the queue used to send events from timers or the Ethernet
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105 driver to the uIP stack. */
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106 #define uipEVENT_QUEUE_LENGTH 10
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108 /* A block time of zero simply means "don't block". */
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109 #define uipDONT_BLOCK 0UL
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111 /* How long to wait before attempting to connect the MAC again. */
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112 #define uipINIT_WAIT ( 100 / portTICK_RATE_MS )
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114 /* Shortcut to the header within the Rx buffer. */
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115 #define xHeader ((struct uip_eth_hdr *) &uip_buf[ 0 ])
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117 /* Standard constant. */
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118 #define uipTOTAL_FRAME_HEADER_SIZE 54
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120 /*-----------------------------------------------------------*/
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123 * Setup the MAC address in the MAC itself, and in the uIP stack.
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125 static void prvSetMACAddress( void );
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128 * Perform any uIP initialisation required to ready the stack for http
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131 static void prvInitialise_uIP( void );
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134 * Handles Ethernet interrupt events.
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136 static void prvEMACEventListener( unsigned long ulISREvents );
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139 * The callback function that is assigned to both the periodic timer and the
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142 static void prvUIPTimerCallback( xTimerHandle xTimer );
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145 * Initialise the MAC hardware.
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147 static void prvInitEmac( void );
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150 * Write data to the Ethener. Note that this actually writes data twice for the
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151 * to get around delayed ack issues when communicating with a non real-time
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152 * peer (for example, a Windows machine).
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154 void vEMACWrite( void );
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157 * Port functions required by the uIP stack.
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159 clock_time_t clock_time( void );
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161 /*-----------------------------------------------------------*/
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163 /* The queue used to send TCP/IP events to the uIP stack. */
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164 xQueueHandle xEMACEventQueue = NULL;
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166 /*-----------------------------------------------------------*/
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168 clock_time_t clock_time( void )
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170 return xTaskGetTickCount();
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172 /*-----------------------------------------------------------*/
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174 void vuIP_Task( void *pvParameters )
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177 unsigned long ulNewEvent = 0UL, ulUIP_Events = 0UL;
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178 long lPacketLength;
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180 /* Just to prevent compiler warnings about the unused parameter. */
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181 ( void ) pvParameters;
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183 /* Initialise the uIP stack, configuring for web server usage. */
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184 prvInitialise_uIP();
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186 /* Initialise the MAC and PHY. */
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191 /* Is there received data ready to be processed? */
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192 lPacketLength = MSS_MAC_rx_packet();
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194 /* Statements to be executed if data has been received on the Ethernet. */
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195 if( ( lPacketLength > 0 ) && ( uip_buf != NULL ) )
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197 uip_len = ( u16_t ) lPacketLength;
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199 /* Standard uIP loop taken from the uIP manual. */
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200 if( xHeader->type == htons( UIP_ETHTYPE_IP ) )
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205 /* If the above function invocation resulted in data that
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206 should be sent out on the network, the global variable
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207 uip_len is set to a value > 0. */
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214 else if( xHeader->type == htons( UIP_ETHTYPE_ARP ) )
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218 /* If the above function invocation resulted in data that
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219 should be sent out on the network, the global variable
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220 uip_len is set to a value > 0. */
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229 /* Clear the RX event latched in ulUIP_Events - if one was latched. */
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230 ulUIP_Events &= ~uipETHERNET_RX_EVENT;
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233 /* Statements to be executed if the TCP/IP period timer has expired. */
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234 if( ( ulUIP_Events & uipPERIODIC_TIMER_EVENT ) != 0UL )
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236 ulUIP_Events &= ~uipPERIODIC_TIMER_EVENT;
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238 if( uip_buf != NULL )
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240 for( i = 0; i < UIP_CONNS; i++ )
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244 /* If the above function invocation resulted in data that
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245 should be sent out on the network, the global variable
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246 uip_len is set to a value > 0. */
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256 /* Statements to be executed if the ARP timer has expired. */
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257 if( ( ulUIP_Events & uipARP_TIMER_EVENT ) != 0 )
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259 ulUIP_Events &= ~uipARP_TIMER_EVENT;
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263 /* If all latched events have been cleared - block until another event
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265 if( ulUIP_Events == pdFALSE )
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267 xQueueReceive( xEMACEventQueue, &ulNewEvent, portMAX_DELAY );
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268 ulUIP_Events |= ulNewEvent;
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272 /*-----------------------------------------------------------*/
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274 static void prvSetMACAddress( void )
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276 struct uip_eth_addr xAddr;
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278 /* Configure the MAC address in the uIP stack. */
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279 xAddr.addr[ 0 ] = configMAC_ADDR0;
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280 xAddr.addr[ 1 ] = configMAC_ADDR1;
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281 xAddr.addr[ 2 ] = configMAC_ADDR2;
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282 xAddr.addr[ 3 ] = configMAC_ADDR3;
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283 xAddr.addr[ 4 ] = configMAC_ADDR4;
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284 xAddr.addr[ 5 ] = configMAC_ADDR5;
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285 uip_setethaddr( xAddr );
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287 /*-----------------------------------------------------------*/
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289 static void prvInitialise_uIP( void )
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291 uip_ipaddr_t xIPAddr;
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292 xTimerHandle xARPTimer, xPeriodicTimer;
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295 uip_ipaddr( &xIPAddr, configIP_ADDR0, configIP_ADDR1, configIP_ADDR2, configIP_ADDR3 );
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296 uip_sethostaddr( &xIPAddr );
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297 uip_ipaddr( &xIPAddr, configNET_MASK0, configNET_MASK1, configNET_MASK2, configNET_MASK3 );
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298 uip_setnetmask( &xIPAddr );
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299 prvSetMACAddress();
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302 /* Create the queue used to sent TCP/IP events to the uIP stack. */
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303 xEMACEventQueue = xQueueCreate( uipEVENT_QUEUE_LENGTH, sizeof( unsigned long ) );
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305 /* Create and start the uIP timers. */
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306 xARPTimer = xTimerCreate( ( signed char * ) "ARPTimer", /* Just a name that is helpful for debugging, not used by the kernel. */
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307 ( 10000UL / portTICK_RATE_MS ), /* Timer period. */
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308 pdTRUE, /* Autor-reload. */
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309 ( void * ) uipARP_TIMER,
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310 prvUIPTimerCallback
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313 xPeriodicTimer = xTimerCreate( ( signed char * ) "PeriodicTimer",
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314 ( 500UL / portTICK_RATE_MS ),
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315 pdTRUE, /* Autor-reload. */
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316 ( void * ) uipPERIODIC_TIMER,
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317 prvUIPTimerCallback
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320 /* Sanity check that the timers were indeed created. */
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321 configASSERT( xARPTimer );
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322 configASSERT( xPeriodicTimer );
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324 /* These commands will block indefinitely until they succeed, so there is
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325 no point in checking their return values. */
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326 xTimerStart( xARPTimer, portMAX_DELAY );
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327 xTimerStart( xPeriodicTimer, portMAX_DELAY );
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329 /*-----------------------------------------------------------*/
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331 static void prvEMACEventListener( unsigned long ulISREvents )
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333 long lHigherPriorityTaskWoken = pdFALSE;
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334 const unsigned long ulRxEvent = uipETHERNET_RX_EVENT;
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336 /* Sanity check that the event queue was indeed created. */
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337 configASSERT( xEMACEventQueue );
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339 if( ( ulISREvents & MSS_MAC_EVENT_PACKET_SEND ) != 0UL )
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341 /* An Ethernet Tx event has occurred. */
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342 MSS_MAC_FreeTxBuffers();
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345 if( ( ulISREvents & MSS_MAC_EVENT_PACKET_RECEIVED ) != 0UL )
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347 /* An Ethernet Rx event has occurred. */
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348 xQueueSendFromISR( xEMACEventQueue, &ulRxEvent, &lHigherPriorityTaskWoken );
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351 portEND_SWITCHING_ISR( lHigherPriorityTaskWoken );
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353 /*-----------------------------------------------------------*/
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355 static void prvInitEmac( void )
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357 const unsigned char ucPHYAddress = 1;
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359 /* Initialise the MAC and PHY hardware. */
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360 MSS_MAC_init( ucPHYAddress );
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362 /* Register the event listener. The Ethernet interrupt handler will call
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363 this listener whenever an Rx or a Tx interrupt occurs. */
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364 MSS_MAC_set_callback( ( MSS_MAC_callback_t ) prvEMACEventListener );
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366 /* Setup the EMAC and the NVIC for MAC interrupts. */
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367 NVIC_SetPriority( EthernetMAC_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
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368 NVIC_EnableIRQ( EthernetMAC_IRQn );
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370 /*-----------------------------------------------------------*/
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372 void vEMACWrite( void )
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374 const long lMaxAttempts = 10;
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376 const portTickType xShortDelay = ( 5 / portTICK_RATE_MS );
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378 /* Try to send data to the Ethernet. Keep trying for a while if data cannot
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379 be sent immediately. Note that this will actually cause the data to be sent
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380 twice to get around delayed ACK problems when communicating with non real-
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381 time TCP/IP stacks (such as a Windows machine). */
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382 for( lAttempt = 0; lAttempt < lMaxAttempts; lAttempt++ )
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384 if( MSS_MAC_tx_packet( uip_len ) != 0 )
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390 vTaskDelay( xShortDelay );
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394 /*-----------------------------------------------------------*/
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396 static void prvUIPTimerCallback( xTimerHandle xTimer )
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398 static const unsigned long ulARPTimerExpired = uipARP_TIMER_EVENT;
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399 static const unsigned long ulPeriodicTimerExpired = uipPERIODIC_TIMER_EVENT;
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401 /* This is a time callback, so calls to xQueueSend() must not attempt to
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402 block. As this callback is assigned to both the ARP and Periodic timers, the
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403 first thing to do is ascertain which timer it was that actually expired. */
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404 switch( ( int ) pvTimerGetTimerID( xTimer ) )
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406 case uipARP_TIMER : xQueueSend( xEMACEventQueue, &ulARPTimerExpired, uipDONT_BLOCK );
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409 case uipPERIODIC_TIMER : xQueueSend( xEMACEventQueue, &ulPeriodicTimerExpired, uipDONT_BLOCK );
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412 default : /* Should not get here. */
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416 /*-----------------------------------------------------------*/
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418 void vApplicationProcessFormInput( char *pcInputString )
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422 /* Only interested in processing form input if this is the IO page. */
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423 c = strstr( pcInputString, "io.shtml" );
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427 /* Is there a command in the string? */
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428 c = strstr( pcInputString, "?" );
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431 /* Turn the LED's on or off in accordance with the check box status. */
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432 if( strstr( c, "LED0=1" ) != NULL )
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434 /* Turn the LEDs on. */
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435 vParTestSetLED( 3, 1 );
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436 vParTestSetLED( 4, 1 );
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440 /* Turn the LEDs off. */
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441 vParTestSetLED( 3, 0 );
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442 vParTestSetLED( 4, 0 );
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447 /* Commands to turn LEDs off are not always explicit. */
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448 vParTestSetLED( 3, 0 );
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449 vParTestSetLED( 4, 0 );
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453 /*-----------------------------------------------------------*/
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