2 * FreeRTOS+UDP V1.0.0 (C) 2013 Real Time Engineers ltd.
\r
4 * This file is part of the FreeRTOS+UDP distribution. The FreeRTOS+UDP license
\r
5 * terms are different to the FreeRTOS license terms.
\r
7 * FreeRTOS+UDP uses a dual license model that allows the software to be used
\r
8 * under a pure GPL open source license (as opposed to the modified GPL license
\r
9 * under which FreeRTOS is distributed) or a commercial license. Details of
\r
10 * both license options follow:
\r
12 * - Open source licensing -
\r
13 * FreeRTOS+UDP is a free download and may be used, modified, evaluated and
\r
14 * distributed without charge provided the user adheres to version two of the
\r
15 * GNU General Public License (GPL) and does not remove the copyright notice or
\r
16 * this text. The GPL V2 text is available on the gnu.org web site, and on the
\r
17 * following URL: http://www.FreeRTOS.org/gpl-2.0.txt.
\r
19 * - Commercial licensing -
\r
20 * Businesses and individuals that for commercial or other reasons cannot comply
\r
21 * with the terms of the GPL V2 license must obtain a commercial license before
\r
22 * incorporating FreeRTOS+UDP into proprietary software for distribution in any
\r
23 * form. Commercial licenses can be purchased from http://shop.freertos.org/udp
\r
24 * and do not require any source files to be changed.
\r
26 * FreeRTOS+UDP is distributed in the hope that it will be useful. You cannot
\r
27 * use FreeRTOS+UDP unless you agree that you use the software 'as is'.
\r
28 * FreeRTOS+UDP is provided WITHOUT ANY WARRANTY; without even the implied
\r
29 * warranties of NON-INFRINGEMENT, MERCHANTABILITY or FITNESS FOR A PARTICULAR
\r
30 * PURPOSE. Real Time Engineers Ltd. disclaims all conditions and terms, be they
\r
31 * implied, expressed, or statutory.
\r
33 * 1 tab == 4 spaces!
\r
35 * http://www.FreeRTOS.org
\r
36 * http://www.FreeRTOS.org/udp
\r
40 /* Standard includes. */
\r
43 /* FreeRTOS includes. */
\r
44 #include "FreeRTOS.h"
\r
49 /* FreeRTOS+UDP includes. */
\r
50 #include "FreeRTOS_UDP_IP.h"
\r
51 #include "FreeRTOS_IP_Private.h"
\r
52 #include "FreeRTOS_Sockets.h"
\r
53 #include "NetworkBufferManagement.h"
\r
55 /* Driver includes. */
\r
56 #include "lpc18xx_emac.h"
\r
58 /* Demo includes. */
\r
59 #include "NetworkInterface.h"
\r
61 #ifndef configNUM_RX_ETHERNET_DMA_DESCRIPTORS
\r
62 #error configNUM_RX_ETHERNET_DMA_DESCRIPTORS must be defined in FreeRTOSConfig.h to set the number of RX DMA descriptors
\r
65 #ifndef configNUM_TX_ETHERNET_DMA_DESCRIPTORS
\r
66 #error configNUM_TX_ETHERNET_DMA_DESCRIPTORS must be defined in FreeRTOSConfig.h to set the number of TX DMA descriptors
\r
69 /* If a packet cannot be sent immediately then the task performing the send
\r
70 operation will be held in the Blocked state (so other tasks can execute) for
\r
71 niTX_BUFFER_FREE_WAIT ticks. It will do this a maximum of niMAX_TX_ATTEMPTS
\r
72 before giving up. */
\r
73 #define niTX_BUFFER_FREE_WAIT ( ( portTickType ) 2UL / portTICK_RATE_MS )
\r
74 #define niMAX_TX_ATTEMPTS ( 5 )
\r
76 /*-----------------------------------------------------------*/
\r
79 * A deferred interrupt handler task that processes received frames.
\r
81 static void prvEMACDeferredInterruptHandlerTask( void *pvParameters );
\r
83 /*-----------------------------------------------------------*/
\r
85 /* The queue used to communicate Ethernet events to the IP task. */
\r
86 extern xQueueHandle xNetworkEventQueue;
\r
88 /* The semaphore used to wake the deferred interrupt handler task when an Rx
\r
89 interrupt is received. */
\r
90 static xSemaphoreHandle xEMACRxEventSemaphore = NULL;
\r
92 /*-----------------------------------------------------------*/
\r
94 portBASE_TYPE xNetworkInterfaceInitialise( void )
\r
96 EMAC_CFG_Type Emac_Config;
\r
97 portBASE_TYPE xReturn;
\r
98 extern uint8_t ucMACAddress[ 6 ];
\r
100 Emac_Config.pbEMAC_Addr = ucMACAddress;
\r
101 xReturn = EMAC_Init( &Emac_Config );
\r
103 if( xReturn == pdPASS )
\r
105 LPC_ETHERNET->DMA_INT_EN = DMA_INT_NOR_SUM | DMA_INT_RECEIVE;
\r
107 /* Create the event semaphore if it has not already been created. */
\r
108 if( xEMACRxEventSemaphore == NULL )
\r
110 vSemaphoreCreateBinary( xEMACRxEventSemaphore );
\r
111 #if ipconfigINCLUDE_EXAMPLE_FREERTOS_PLUS_TRACE_CALLS == 1
\r
113 /* If the trace recorder code is included name the semaphore for
\r
114 viewing in FreeRTOS+Trace. */
\r
115 vTraceSetQueueName( xEMACRxEventSemaphore, "MAC_RX" );
\r
117 #endif /* ipconfigINCLUDE_EXAMPLE_FREERTOS_PLUS_TRACE_CALLS == 1 */
\r
120 configASSERT( xEMACRxEventSemaphore );
\r
122 /* The Rx deferred interrupt handler task is created at the highest
\r
123 possible priority to ensure the interrupt handler can return directly to
\r
124 it no matter which task was running when the interrupt occurred. */
\r
125 xTaskCreate( prvEMACDeferredInterruptHandlerTask, /* The function that implements the task. */
\r
126 ( const signed char * const ) "MACTsk",
\r
127 configMINIMAL_STACK_SIZE, /* Stack allocated to the task (defined in words, not bytes). */
\r
128 NULL, /* The task parameter is not used. */
\r
129 configMAX_PRIORITIES - 1, /* The priority assigned to the task. */
\r
130 NULL ); /* The handle is not required, so NULL is passed. */
\r
132 /* Enable the interrupt and set its priority as configured. THIS
\r
133 DRIVER REQUIRES configMAC_INTERRUPT_PRIORITY TO BE DEFINED, PREFERABLY
\r
134 IN FreeRTOSConfig.h. */
\r
135 NVIC_SetPriority( ETHERNET_IRQn, configMAC_INTERRUPT_PRIORITY );
\r
136 NVIC_EnableIRQ( ETHERNET_IRQn );
\r
141 /*-----------------------------------------------------------*/
\r
143 portBASE_TYPE xNetworkInterfaceOutput( xNetworkBufferDescriptor_t * const pxNetworkBuffer )
\r
145 portBASE_TYPE xReturn = pdFAIL;
\r
148 /* Attempt to obtain access to a Tx descriptor. */
\r
149 for( x = 0; x < niMAX_TX_ATTEMPTS; x++ )
\r
151 if( EMAC_CheckTransmitIndex() == TRUE )
\r
153 /* Assign the buffer being transmitted to the Tx descriptor. */
\r
154 EMAC_SetNextPacketToSend( pxNetworkBuffer->pucEthernetBuffer );
\r
156 /* The EMAC now owns the buffer and will free it when it has been
\r
157 transmitted. Set pucBuffer to NULL to ensure the buffer is not
\r
158 freed when the network buffer structure is returned to the pool
\r
159 of network buffers. */
\r
160 pxNetworkBuffer->pucEthernetBuffer = NULL;
\r
162 /* Initiate the Tx. */
\r
163 EMAC_StartTransmitNextBuffer( pxNetworkBuffer->xDataLength );
\r
164 iptraceNETWORK_INTERFACE_TRANSMIT();
\r
166 /* The Tx has been initiated. */
\r
173 iptraceWAITING_FOR_TX_DMA_DESCRIPTOR();
\r
174 vTaskDelay( niTX_BUFFER_FREE_WAIT );
\r
178 /* Finished with the network buffer. */
\r
179 vNetworkBufferRelease( pxNetworkBuffer );
\r
183 /*-----------------------------------------------------------*/
\r
185 void ETH_IRQHandler( void )
\r
187 uint32_t ulInterruptCause;
\r
189 ulInterruptCause = LPC_ETHERNET->DMA_STAT ;
\r
191 /* Clear the interrupt. */
\r
192 LPC_ETHERNET->DMA_STAT |= ( DMA_INT_NOR_SUM | DMA_INT_RECEIVE );
\r
194 /* Clear fatal error conditions. NOTE: The driver does not clear all
\r
195 errors, only those actually experienced. For future reference, range
\r
196 errors are not actually errors so can be ignored. */
\r
197 if( ( ulInterruptCause & ( 1 << 13 ) ) != 0U )
\r
199 LPC_ETHERNET->DMA_STAT |= ( 1 << 13 );
\r
202 /* Unblock the deferred interrupt handler task if the event was an Rx. */
\r
203 if( ( ulInterruptCause & DMA_INT_RECEIVE ) != 0UL )
\r
205 xSemaphoreGiveFromISR( xEMACRxEventSemaphore, NULL );
\r
208 /* ulInterruptCause is used for convenience here. A context switch is
\r
209 wanted, but coding portEND_SWITCHING_ISR( 1 ) would likely result in a
\r
210 compiler warning. */
\r
211 portEND_SWITCHING_ISR( ulInterruptCause );
\r
213 /*-----------------------------------------------------------*/
\r
215 static void prvEMACDeferredInterruptHandlerTask( void *pvParameters )
\r
217 xNetworkBufferDescriptor_t *pxNetworkBuffer;
\r
218 xIPStackEvent_t xRxEvent = { eEthernetRxEvent, NULL };
\r
220 ( void ) pvParameters;
\r
221 configASSERT( xEMACRxEventSemaphore );
\r
225 /* Wait for the EMAC interrupt to indicate that another packet has been
\r
226 received. The while() loop is only needed if INCLUDE_vTaskSuspend is
\r
227 set to 0 in FreeRTOSConfig.h. If INCLUDE_vTaskSuspend is set to 1
\r
228 then portMAX_DELAY would be an indefinite block time and
\r
229 xSemaphoreTake() would only return when the semaphore was actually
\r
231 while( xSemaphoreTake( xEMACRxEventSemaphore, portMAX_DELAY ) == pdFALSE );
\r
233 /* At least one packet has been received. */
\r
234 while( EMAC_CheckReceiveIndex() != FALSE )
\r
236 /* The buffer filled by the DMA is going to be passed into the IP
\r
237 stack. Allocate another buffer for the DMA descriptor. */
\r
238 pxNetworkBuffer = pxNetworkBufferGet( ipTOTAL_ETHERNET_FRAME_SIZE, ( portTickType ) 0 );
\r
240 if( pxNetworkBuffer != NULL )
\r
242 /* Swap the buffer just allocated and referenced from the
\r
243 pxNetworkBuffer with the buffer that has already been filled by
\r
244 the DMA. pxNetworkBuffer will then hold a reference to the
\r
245 buffer that already contains the data without any data having
\r
246 been copied between buffers. */
\r
247 EMAC_NextPacketToRead( pxNetworkBuffer );
\r
249 #if ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES == 1
\r
251 if( pxNetworkBuffer->xDataLength > 0 )
\r
253 /* If the frame would not be processed by the IP stack then
\r
254 don't even bother sending it to the IP stack. */
\r
255 if( eConsiderFrameForProcessing( pxNetworkBuffer->pucEthernetBuffer ) != eProcessBuffer )
\r
257 pxNetworkBuffer->xDataLength = 0;
\r
263 if( pxNetworkBuffer->xDataLength > 0 )
\r
265 /* Store a pointer to the network buffer structure in the
\r
266 padding space that was left in front of the Ethernet frame.
\r
267 The pointer is needed to ensure the network buffer structure
\r
268 can be located when it is time for it to be freed if the
\r
269 Ethernet frame gets used as a zero copy buffer. */
\r
270 *( ( xNetworkBufferDescriptor_t ** ) ( ( pxNetworkBuffer->pucEthernetBuffer - ipBUFFER_PADDING ) ) ) = pxNetworkBuffer;
\r
272 /* Data was received and stored. Send it to the IP task
\r
274 xRxEvent.pvData = ( void * ) pxNetworkBuffer;
\r
275 if( xQueueSendToBack( xNetworkEventQueue, &xRxEvent, ( portTickType ) 0 ) == pdFALSE )
\r
277 /* The buffer could not be sent to the IP task so the
\r
278 buffer must be released. */
\r
279 vNetworkBufferRelease( pxNetworkBuffer );
\r
280 iptraceETHERNET_RX_EVENT_LOST();
\r
284 iptraceNETWORK_INTERFACE_RECEIVE();
\r
289 /* The buffer does not contain any data so there is no
\r
290 point sending it to the IP task. Just release it. */
\r
291 vNetworkBufferRelease( pxNetworkBuffer );
\r
292 iptraceETHERNET_RX_EVENT_LOST();
\r
297 iptraceETHERNET_RX_EVENT_LOST();
\r
300 /* Release the descriptor. */
\r
301 EMAC_UpdateRxConsumeIndex();
\r
305 /*-----------------------------------------------------------*/
\r