2 * FreeRTOS+UDP V1.0.0 (C) 2013 Real Time Engineers ltd.
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4 * This file is part of the FreeRTOS+UDP distribution. The FreeRTOS+UDP license
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5 * terms are different to the FreeRTOS license terms.
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7 * FreeRTOS+UDP uses a dual license model that allows the software to be used
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8 * under a pure GPL open source license (as opposed to the modified GPL license
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9 * under which FreeRTOS is distributed) or a commercial license. Details of
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10 * both license options follow:
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12 * - Open source licensing -
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13 * FreeRTOS+UDP is a free download and may be used, modified, evaluated and
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14 * distributed without charge provided the user adheres to version two of the
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15 * GNU General Public License (GPL) and does not remove the copyright notice or
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16 * this text. The GPL V2 text is available on the gnu.org web site, and on the
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17 * following URL: http://www.FreeRTOS.org/gpl-2.0.txt.
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19 * - Commercial licensing -
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20 * Businesses and individuals that for commercial or other reasons cannot comply
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21 * with the terms of the GPL V2 license must obtain a commercial license before
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22 * incorporating FreeRTOS+UDP into proprietary software for distribution in any
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23 * form. Commercial licenses can be purchased from http://shop.freertos.org/udp
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24 * and do not require any source files to be changed.
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26 * FreeRTOS+UDP is distributed in the hope that it will be useful. You cannot
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27 * use FreeRTOS+UDP unless you agree that you use the software 'as is'.
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28 * FreeRTOS+UDP is provided WITHOUT ANY WARRANTY; without even the implied
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29 * warranties of NON-INFRINGEMENT, MERCHANTABILITY or FITNESS FOR A PARTICULAR
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30 * PURPOSE. Real Time Engineers Ltd. disclaims all conditions and terms, be they
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31 * implied, expressed, or statutory.
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33 * 1 tab == 4 spaces!
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35 * http://www.FreeRTOS.org
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36 * http://www.FreeRTOS.org/udp
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40 /* Standard includes. */
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43 /* FreeRTOS includes. */
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44 #include "FreeRTOS.h"
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49 /* FreeRTOS+UDP includes. */
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50 #include "FreeRTOS_UDP_IP.h"
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51 #include "FreeRTOS_IP_Private.h"
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52 #include "FreeRTOS_Sockets.h"
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53 #include "NetworkBufferManagement.h"
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55 /* Driver includes. */
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56 #include "lpc18xx_emac.h"
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58 /* Demo includes. */
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59 #include "NetworkInterface.h"
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61 #if configMAC_INTERRUPT_PRIORITY > configMAC_INTERRUPT_PRIORITY
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62 #error configMAC_INTERRUPT_PRIORITY must be greater than or equal to configMAC_INTERRUPT_PRIORITY (higher numbers mean lower logical priority)
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65 #ifndef configNUM_RX_ETHERNET_DMA_DESCRIPTORS
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66 #error configNUM_RX_ETHERNET_DMA_DESCRIPTORS must be defined in FreeRTOSConfig.h to set the number of RX DMA descriptors
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69 #ifndef configNUM_TX_ETHERNET_DMA_DESCRIPTORS
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70 #error configNUM_TX_ETHERNET_DMA_DESCRIPTORS must be defined in FreeRTOSConfig.h to set the number of TX DMA descriptors
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73 /* If a packet cannot be sent immediately then the task performing the send
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74 operation will be held in the Blocked state (so other tasks can execute) for
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75 niTX_BUFFER_FREE_WAIT ticks. It will do this a maximum of niMAX_TX_ATTEMPTS
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76 before giving up. */
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77 #define niTX_BUFFER_FREE_WAIT ( ( portTickType ) 2UL / portTICK_RATE_MS )
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78 #define niMAX_TX_ATTEMPTS ( 5 )
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80 /*-----------------------------------------------------------*/
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83 * A deferred interrupt handler task that processes received frames.
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85 static void prvEMACDeferredInterruptHandlerTask( void *pvParameters );
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87 /*-----------------------------------------------------------*/
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89 /* The queue used to communicate Ethernet events to the IP task. */
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90 extern xQueueHandle xNetworkEventQueue;
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92 /* The semaphore used to wake the deferred interrupt handler task when an Rx
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93 interrupt is received. */
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94 static xSemaphoreHandle xEMACRxEventSemaphore = NULL;
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96 /*-----------------------------------------------------------*/
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98 portBASE_TYPE xNetworkInterfaceInitialise( void )
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100 EMAC_CFG_Type Emac_Config;
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101 portBASE_TYPE xReturn;
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102 extern uint8_t ucMACAddress[ 6 ];
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104 Emac_Config.pbEMAC_Addr = ucMACAddress;
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105 xReturn = EMAC_Init( &Emac_Config );
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107 if( xReturn == pdPASS )
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109 LPC_ETHERNET->DMA_INT_EN = DMA_INT_NOR_SUM | DMA_INT_RECEIVE;
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111 /* Create the event semaphore if it has not already been created. */
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112 if( xEMACRxEventSemaphore == NULL )
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114 vSemaphoreCreateBinary( xEMACRxEventSemaphore );
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115 #if ipconfigINCLUDE_EXAMPLE_FREERTOS_PLUS_TRACE_CALLS == 1
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117 /* If the trace recorder code is included name the semaphore for
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118 viewing in FreeRTOS+Trace. */
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119 vTraceSetQueueName( xEMACRxEventSemaphore, "MAC_RX" );
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121 #endif /* ipconfigINCLUDE_EXAMPLE_FREERTOS_PLUS_TRACE_CALLS == 1 */
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124 configASSERT( xEMACRxEventSemaphore );
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126 /* The Rx deferred interrupt handler task is created at the highest
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127 possible priority to ensure the interrupt handler can return directly to
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128 it no matter which task was running when the interrupt occurred. */
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129 xTaskCreate( prvEMACDeferredInterruptHandlerTask, /* The function that implements the task. */
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130 ( const signed char * const ) "MACTsk",
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131 configMINIMAL_STACK_SIZE, /* Stack allocated to the task (defined in words, not bytes). */
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132 NULL, /* The task parameter is not used. */
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133 configMAX_PRIORITIES - 1, /* The priority assigned to the task. */
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134 NULL ); /* The handle is not required, so NULL is passed. */
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136 /* Enable the interrupt and set its priority as configured. THIS
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137 DRIVER REQUIRES configMAC_INTERRUPT_PRIORITY TO BE DEFINED, PREFERABLY
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138 IN FreeRTOSConfig.h. */
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139 NVIC_SetPriority( ETHERNET_IRQn, configMAC_INTERRUPT_PRIORITY );
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140 NVIC_EnableIRQ( ETHERNET_IRQn );
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145 /*-----------------------------------------------------------*/
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147 portBASE_TYPE xNetworkInterfaceOutput( xNetworkBufferDescriptor_t * const pxNetworkBuffer )
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149 portBASE_TYPE xReturn = pdFAIL;
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152 /* Attempt to obtain access to a Tx descriptor. */
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153 for( x = 0; x < niMAX_TX_ATTEMPTS; x++ )
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155 if( EMAC_CheckTransmitIndex() == TRUE )
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157 /* Assign the buffer being transmitted to the Tx descriptor. */
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158 EMAC_SetNextPacketToSend( pxNetworkBuffer->pucEthernetBuffer );
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160 /* The EMAC now owns the buffer and will free it when it has been
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161 transmitted. Set pucBuffer to NULL to ensure the buffer is not
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162 freed when the network buffer structure is returned to the pool
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163 of network buffers. */
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164 pxNetworkBuffer->pucEthernetBuffer = NULL;
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166 /* Initiate the Tx. */
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167 EMAC_StartTransmitNextBuffer( pxNetworkBuffer->xDataLength );
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168 iptraceNETWORK_INTERFACE_TRANSMIT();
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170 /* The Tx has been initiated. */
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177 iptraceWAITING_FOR_TX_DMA_DESCRIPTOR();
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178 vTaskDelay( niTX_BUFFER_FREE_WAIT );
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182 /* Finished with the network buffer. */
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183 vNetworkBufferRelease( pxNetworkBuffer );
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187 /*-----------------------------------------------------------*/
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189 void ETH_IRQHandler( void )
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191 uint32_t ulInterruptCause;
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193 ulInterruptCause = LPC_ETHERNET->DMA_STAT ;
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195 /* Clear the interrupt. */
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196 LPC_ETHERNET->DMA_STAT |= ( DMA_INT_NOR_SUM | DMA_INT_RECEIVE );
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198 /* Clear fatal error conditions. NOTE: The driver does not clear all
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199 errors, only those actually experienced. For future reference, range
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200 errors are not actually errors so can be ignored. */
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201 if( ( ulInterruptCause & ( 1 << 13 ) ) != 0U )
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203 LPC_ETHERNET->DMA_STAT |= ( 1 << 13 );
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206 /* Unblock the deferred interrupt handler task if the event was an Rx. */
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207 if( ( ulInterruptCause & DMA_INT_RECEIVE ) != 0UL )
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209 xSemaphoreGiveFromISR( xEMACRxEventSemaphore, NULL );
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212 /* ulInterruptCause is used for convenience here. A context switch is
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213 wanted, but coding portEND_SWITCHING_ISR( 1 ) would likely result in a
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214 compiler warning. */
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215 portEND_SWITCHING_ISR( ulInterruptCause );
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217 /*-----------------------------------------------------------*/
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219 static void prvEMACDeferredInterruptHandlerTask( void *pvParameters )
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221 xNetworkBufferDescriptor_t *pxNetworkBuffer;
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222 xIPStackEvent_t xRxEvent = { eEthernetRxEvent, NULL };
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224 ( void ) pvParameters;
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225 configASSERT( xEMACRxEventSemaphore );
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229 /* Wait for the EMAC interrupt to indicate that another packet has been
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230 received. The while() loop is only needed if INCLUDE_vTaskSuspend is
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231 set to 0 in FreeRTOSConfig.h. If INCLUDE_vTaskSuspend is set to 1
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232 then portMAX_DELAY would be an indefinite block time and
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233 xSemaphoreTake() would only return when the semaphore was actually
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235 while( xSemaphoreTake( xEMACRxEventSemaphore, portMAX_DELAY ) == pdFALSE );
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237 /* At least one packet has been received. */
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238 while( EMAC_CheckReceiveIndex() != FALSE )
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240 /* The buffer filled by the DMA is going to be passed into the IP
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241 stack. Allocate another buffer for the DMA descriptor. */
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242 pxNetworkBuffer = pxNetworkBufferGet( ipTOTAL_ETHERNET_FRAME_SIZE, ( portTickType ) 0 );
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244 if( pxNetworkBuffer != NULL )
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246 /* Swap the buffer just allocated and referenced from the
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247 pxNetworkBuffer with the buffer that has already been filled by
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248 the DMA. pxNetworkBuffer will then hold a reference to the
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249 buffer that already contains the data without any data having
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250 been copied between buffers. */
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251 EMAC_NextPacketToRead( pxNetworkBuffer );
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253 #if ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES == 1
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255 if( pxNetworkBuffer->xDataLength > 0 )
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257 /* If the frame would not be processed by the IP stack then
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258 don't even bother sending it to the IP stack. */
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259 if( eConsiderFrameForProcessing( pxNetworkBuffer->pucEthernetBuffer ) != eProcessBuffer )
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261 pxNetworkBuffer->xDataLength = 0;
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267 if( pxNetworkBuffer->xDataLength > 0 )
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269 /* Store a pointer to the network buffer structure in the
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270 padding space that was left in front of the Ethernet frame.
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271 The pointer is needed to ensure the network buffer structure
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272 can be located when it is time for it to be freed if the
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273 Ethernet frame gets used as a zero copy buffer. */
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274 *( ( xNetworkBufferDescriptor_t ** ) ( ( pxNetworkBuffer->pucEthernetBuffer - ipBUFFER_PADDING ) ) ) = pxNetworkBuffer;
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276 /* Data was received and stored. Send it to the IP task
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278 xRxEvent.pvData = ( void * ) pxNetworkBuffer;
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279 if( xQueueSendToBack( xNetworkEventQueue, &xRxEvent, ( portTickType ) 0 ) == pdFALSE )
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281 /* The buffer could not be sent to the IP task so the
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282 buffer must be released. */
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283 vNetworkBufferRelease( pxNetworkBuffer );
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284 iptraceETHERNET_RX_EVENT_LOST();
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288 iptraceNETWORK_INTERFACE_RECEIVE();
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293 /* The buffer does not contain any data so there is no
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294 point sending it to the IP task. Just release it. */
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295 vNetworkBufferRelease( pxNetworkBuffer );
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296 iptraceETHERNET_RX_EVENT_LOST();
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301 iptraceETHERNET_RX_EVENT_LOST();
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304 /* Release the descriptor. */
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305 EMAC_UpdateRxConsumeIndex();
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309 /*-----------------------------------------------------------*/
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