2 FreeRTOS V8.1.2 - Copyright (C) 2014 Real Time Engineers Ltd.
\r
5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
\r
7 ***************************************************************************
\r
9 * FreeRTOS provides completely free yet professionally developed, *
\r
10 * robust, strictly quality controlled, supported, and cross *
\r
11 * platform software that has become a de facto standard. *
\r
13 * Help yourself get started quickly and support the FreeRTOS *
\r
14 * project by purchasing a FreeRTOS tutorial book, reference *
\r
15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
\r
19 ***************************************************************************
\r
21 This file is part of the FreeRTOS distribution.
\r
23 FreeRTOS is free software; you can redistribute it and/or modify it under
\r
24 the terms of the GNU General Public License (version 2) as published by the
\r
25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
\r
27 >>! NOTE: The modification to the GPL is included to allow you to !<<
\r
28 >>! distribute a combined work that includes FreeRTOS without being !<<
\r
29 >>! obliged to provide the source code for proprietary components !<<
\r
30 >>! outside of the FreeRTOS kernel. !<<
\r
32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
\r
33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
\r
34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
\r
35 link: http://www.freertos.org/a00114.html
\r
39 ***************************************************************************
\r
41 * Having a problem? Start by reading the FAQ "My application does *
\r
42 * not run, what could be wrong?" *
\r
44 * http://www.FreeRTOS.org/FAQHelp.html *
\r
46 ***************************************************************************
\r
48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
\r
49 license and Real Time Engineers Ltd. contact details.
\r
51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
\r
52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
\r
53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
\r
55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
\r
56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
\r
57 licenses offer ticketed support, indemnification and middleware.
\r
59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
\r
60 engineered and independently SIL3 certified version for use in safety and
\r
61 mission critical applications that require provable dependability.
\r
66 /* Kernel includes. */
\r
67 #include "FreeRTOS.h"
\r
71 /* Demo includes. */
\r
77 /* Hardware library includes. */
\r
78 #include "hw_types.h"
\r
79 #include "hw_memmap.h"
\r
80 #include "hw_ints.h"
\r
81 #include "hw_ethernet.h"
\r
82 #include "ethernet.h"
\r
83 #include "interrupt.h"
\r
85 #define emacNUM_RX_BUFFERS 5
\r
86 #define emacFRAM_SIZE_BYTES 2
\r
87 #define macNEGOTIATE_DELAY 2000
\r
88 #define macWAIT_SEND_TIME ( 10 )
\r
90 /* The task that handles the MAC peripheral. This is created at a high
\r
91 priority and is effectively a deferred interrupt handler. The peripheral
\r
92 handling is deferred to a task to prevent the entire FIFO having to be read
\r
93 from within an ISR. */
\r
94 void vMACHandleTask( void *pvParameters );
\r
96 /*-----------------------------------------------------------*/
\r
98 /* The semaphore used to wake the uIP task when data arrives. */
\r
99 SemaphoreHandle_t xEMACSemaphore = NULL;
\r
101 /* The semaphore used to wake the interrupt handler task. The peripheral
\r
102 is processed at the task level to prevent the need to read the entire FIFO from
\r
103 within the ISR itself. */
\r
104 SemaphoreHandle_t xMACInterruptSemaphore = NULL;
\r
106 /* The buffer used by the uIP stack. In this case the pointer is used to
\r
107 point to one of the Rx buffers. */
\r
108 unsigned char *uip_buf;
\r
110 /* Buffers into which Rx data is placed. */
\r
113 unsigned long ulJustForAlignment;
\r
114 unsigned char ucRxBuffers[ emacNUM_RX_BUFFERS ][ UIP_BUFSIZE + ( 4 * emacFRAM_SIZE_BYTES ) ];
\r
117 /* The length of the data within each of the Rx buffers. */
\r
118 static unsigned long ulRxLength[ emacNUM_RX_BUFFERS ];
\r
120 /* Used to keep a track of the number of bytes to transmit. */
\r
121 static unsigned long ulNextTxSpace;
\r
123 /*-----------------------------------------------------------*/
\r
125 portBASE_TYPE vInitEMAC( void )
\r
127 unsigned long ulTemp;
\r
128 portBASE_TYPE xReturn;
\r
130 /* Ensure all interrupts are disabled. */
\r
131 EthernetIntDisable( ETH_BASE, ( ETH_INT_PHY | ETH_INT_MDIO | ETH_INT_RXER | ETH_INT_RXOF | ETH_INT_TX | ETH_INT_TXER | ETH_INT_RX));
\r
133 /* Clear any interrupts that were already pending. */
\r
134 ulTemp = EthernetIntStatus( ETH_BASE, pdFALSE );
\r
135 EthernetIntClear( ETH_BASE, ulTemp );
\r
137 /* Initialise the MAC and connect. */
\r
138 EthernetInit( ETH_BASE );
\r
139 EthernetConfigSet( ETH_BASE, ( ETH_CFG_TX_DPLXEN | ETH_CFG_TX_CRCEN | ETH_CFG_TX_PADEN ) );
\r
140 EthernetEnable( ETH_BASE );
\r
142 /* Mark each Rx buffer as empty. */
\r
143 for( ulTemp = 0; ulTemp < emacNUM_RX_BUFFERS; ulTemp++ )
\r
145 ulRxLength[ ulTemp ] = 0;
\r
148 /* Create the queue and task used to defer the MAC processing to the
\r
150 vSemaphoreCreateBinary( xMACInterruptSemaphore );
\r
151 xSemaphoreTake( xMACInterruptSemaphore, 0 );
\r
152 xReturn = xTaskCreate( vMACHandleTask, "MAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL );
\r
153 vTaskDelay( macNEGOTIATE_DELAY );
\r
155 /* We are only interested in Rx interrupts. */
\r
156 IntPrioritySet( INT_ETH, configKERNEL_INTERRUPT_PRIORITY );
\r
157 IntEnable( INT_ETH );
\r
158 EthernetIntEnable(ETH_BASE, ETH_INT_RX);
\r
162 /*-----------------------------------------------------------*/
\r
164 unsigned int uiGetEMACRxData( unsigned char *ucBuffer )
\r
166 static unsigned long ulNextRxBuffer = 0;
\r
169 iLen = ulRxLength[ ulNextRxBuffer ];
\r
173 /* Leave room for the size at the start of the buffer. */
\r
174 uip_buf = &( uxRxBuffers.ucRxBuffers[ ulNextRxBuffer ][ 2 ] );
\r
176 ulRxLength[ ulNextRxBuffer ] = 0;
\r
179 if( ulNextRxBuffer >= emacNUM_RX_BUFFERS )
\r
181 ulNextRxBuffer = 0;
\r
187 /*-----------------------------------------------------------*/
\r
189 void vInitialiseSend( void )
\r
191 /* Set the index to the first byte to send - skipping over the size
\r
195 /*-----------------------------------------------------------*/
\r
197 void vIncrementTxLength( unsigned long ulLength )
\r
199 ulNextTxSpace += ulLength;
\r
201 /*-----------------------------------------------------------*/
\r
203 void vSendBufferToMAC( void )
\r
205 unsigned long *pulSource;
\r
206 unsigned short * pus;
\r
207 unsigned long ulNextWord;
\r
209 /* Locate the data to be send. */
\r
210 pus = ( unsigned short * ) uip_buf;
\r
212 /* Add in the size of the data. */
\r
214 *pus = ulNextTxSpace;
\r
216 /* Wait for data to be sent if there is no space immediately. */
\r
217 while( !EthernetSpaceAvail( ETH_BASE ) )
\r
219 vTaskDelay( macWAIT_SEND_TIME );
\r
222 pulSource = ( unsigned long * ) pus;
\r
224 for( ulNextWord = 0; ulNextWord < ulNextTxSpace; ulNextWord += sizeof( unsigned long ) )
\r
226 HWREG(ETH_BASE + MAC_O_DATA) = *pulSource;
\r
231 HWREG( ETH_BASE + MAC_O_TR ) = MAC_TR_NEWTX;
\r
233 /*-----------------------------------------------------------*/
\r
235 void vEMAC_ISR( void )
\r
237 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
\r
238 unsigned long ulTemp;
\r
240 /* Clear the interrupt. */
\r
241 ulTemp = EthernetIntStatus( ETH_BASE, pdFALSE );
\r
242 EthernetIntClear( ETH_BASE, ulTemp );
\r
244 /* Was it an Rx interrupt? */
\r
245 if( ulTemp & ETH_INT_RX )
\r
247 xSemaphoreGiveFromISR( xMACInterruptSemaphore, &xHigherPriorityTaskWoken );
\r
248 EthernetIntDisable( ETH_BASE, ETH_INT_RX );
\r
251 /* Switch to the uIP task. */
\r
252 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
\r
254 /*-----------------------------------------------------------*/
\r
256 void vMACHandleTask( void *pvParameters )
\r
258 unsigned long i, ulInt;
\r
259 unsigned long ulLength;
\r
260 unsigned long *pulBuffer;
\r
261 static unsigned long ulNextRxBuffer = 0;
\r
265 /* Wait for something to do. */
\r
266 xSemaphoreTake( xMACInterruptSemaphore, portMAX_DELAY );
\r
268 while( ( ulInt = ( EthernetIntStatus( ETH_BASE, pdFALSE ) & ETH_INT_RX ) ) != 0 )
\r
270 ulLength = HWREG( ETH_BASE + MAC_O_DATA );
\r
272 /* Leave room at the start of the buffer for the size. */
\r
273 pulBuffer = ( unsigned long * ) &( uxRxBuffers.ucRxBuffers[ ulNextRxBuffer ][ 2 ] );
\r
274 *pulBuffer = ( ulLength >> 16 );
\r
276 /* Get the size of the data. */
\r
277 pulBuffer = ( unsigned long * ) &( uxRxBuffers.ucRxBuffers[ ulNextRxBuffer ][ 4 ] );
\r
278 ulLength &= 0xFFFF;
\r
284 if( ulLength >= UIP_BUFSIZE )
\r
286 /* The data won't fit in our buffer. Ensure we don't
\r
287 try to write into the buffer. */
\r
291 /* Read out the data into our buffer. */
\r
292 for( i = 0; i < ulLength; i += sizeof( unsigned long ) )
\r
294 *pulBuffer = HWREG( ETH_BASE + MAC_O_DATA );
\r
298 /* Store the length of the data into the separate array. */
\r
299 ulRxLength[ ulNextRxBuffer ] = ulLength;
\r
301 /* Use the next buffer the next time through. */
\r
303 if( ulNextRxBuffer >= emacNUM_RX_BUFFERS )
\r
305 ulNextRxBuffer = 0;
\r
308 /* Ensure the uIP task is not blocked as data has arrived. */
\r
309 xSemaphoreGive( xEMACSemaphore );
\r
313 EthernetIntEnable( ETH_BASE, ETH_INT_RX );
\r