/* FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd. FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. *************************************************************************** * * * 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 Real Time Engineers Ltd., 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, books, training, latest versions, license and Real Time Engineers Ltd. contact details. http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, including FreeRTOS+Trace - an indispensable productivity tool, and our new fully thread aware and reentrant UDP/IP stack. http://www.OpenRTOS.com - 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.SafeRTOS.com - High Integrity Systems also provide a safety engineered and independently SIL3 certified version for use in safety and mission critical applications that require provable dependability. */ /* Kernel includes. */ #include "FreeRTOS.h" #include "semphr.h" #include "task.h" /* Demo includes. */ #include "emac.h" /* uIP includes. */ #include "uip.h" /* Hardware library includes. */ #include "hw_types.h" #include "hw_memmap.h" #include "hw_ints.h" #include "hw_ethernet.h" #include "ethernet.h" #include "interrupt.h" #define emacNUM_RX_BUFFERS 5 #define emacFRAM_SIZE_BYTES 2 #define macNEGOTIATE_DELAY 2000 #define macWAIT_SEND_TIME ( 10 ) /* The task that handles the MAC peripheral. This is created at a high priority and is effectively a deferred interrupt handler. The peripheral handling is deferred to a task to prevent the entire FIFO having to be read from within an ISR. */ void vMACHandleTask( void *pvParameters ); /*-----------------------------------------------------------*/ /* The semaphore used to wake the uIP task when data arrives. */ xSemaphoreHandle xEMACSemaphore = NULL; /* The semaphore used to wake the interrupt handler task. The peripheral is processed at the task level to prevent the need to read the entire FIFO from within the ISR itself. */ xSemaphoreHandle xMACInterruptSemaphore = NULL; /* The buffer used by the uIP stack. In this case the pointer is used to point to one of the Rx buffers. */ unsigned char *uip_buf; /* Buffers into which Rx data is placed. */ static unsigned char ucRxBuffers[ emacNUM_RX_BUFFERS ][ UIP_BUFSIZE + ( 4 * emacFRAM_SIZE_BYTES ) ] __attribute__((aligned(4))); /* The length of the data within each of the Rx buffers. */ static unsigned long ulRxLength[ emacNUM_RX_BUFFERS ]; /* Used to keep a track of the number of bytes to transmit. */ static unsigned long ulNextTxSpace; /*-----------------------------------------------------------*/ portBASE_TYPE vInitEMAC( void ) { unsigned long ulTemp; portBASE_TYPE xReturn; /* Ensure all interrupts are disabled. */ EthernetIntDisable( ETH_BASE, ( ETH_INT_PHY | ETH_INT_MDIO | ETH_INT_RXER | ETH_INT_RXOF | ETH_INT_TX | ETH_INT_TXER | ETH_INT_RX)); /* Clear any interrupts that were already pending. */ ulTemp = EthernetIntStatus( ETH_BASE, pdFALSE ); EthernetIntClear( ETH_BASE, ulTemp ); /* Initialise the MAC and connect. */ EthernetInit( ETH_BASE ); EthernetConfigSet( ETH_BASE, ( ETH_CFG_TX_DPLXEN | ETH_CFG_TX_CRCEN | ETH_CFG_TX_PADEN ) ); EthernetEnable( ETH_BASE ); /* Mark each Rx buffer as empty. */ for( ulTemp = 0; ulTemp < emacNUM_RX_BUFFERS; ulTemp++ ) { ulRxLength[ ulTemp ] = 0; } /* Create the queue and task used to defer the MAC processing to the task level. */ vSemaphoreCreateBinary( xMACInterruptSemaphore ); xSemaphoreTake( xMACInterruptSemaphore, 0 ); xReturn = xTaskCreate( vMACHandleTask, ( signed char * ) "MAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL ); vTaskDelay( macNEGOTIATE_DELAY ); /* We are only interested in Rx interrupts. */ IntPrioritySet( INT_ETH, configKERNEL_INTERRUPT_PRIORITY ); IntEnable( INT_ETH ); EthernetIntEnable(ETH_BASE, ETH_INT_RX); return xReturn; } /*-----------------------------------------------------------*/ unsigned int uiGetEMACRxData( unsigned char *ucBuffer ) { static unsigned long ulNextRxBuffer = 0; unsigned int iLen; iLen = ulRxLength[ ulNextRxBuffer ]; if( iLen != 0 ) { /* Leave room for the size at the start of the buffer. */ uip_buf = &( ucRxBuffers[ ulNextRxBuffer ][ 2 ] ); ulRxLength[ ulNextRxBuffer ] = 0; ulNextRxBuffer++; if( ulNextRxBuffer >= emacNUM_RX_BUFFERS ) { ulNextRxBuffer = 0; } } return iLen; } /*-----------------------------------------------------------*/ void vInitialiseSend( void ) { /* Set the index to the first byte to send - skipping over the size bytes. */ ulNextTxSpace = 2; } /*-----------------------------------------------------------*/ void vIncrementTxLength( unsigned long ulLength ) { ulNextTxSpace += ulLength; } /*-----------------------------------------------------------*/ void vSendBufferToMAC( void ) { unsigned long *pulSource; unsigned short * pus; unsigned long ulNextWord; /* Locate the data to be send. */ pus = ( unsigned short * ) uip_buf; /* Add in the size of the data. */ pus--; *pus = ulNextTxSpace; /* Wait for data to be sent if there is no space immediately. */ while( !EthernetSpaceAvail( ETH_BASE ) ) { vTaskDelay( macWAIT_SEND_TIME ); } pulSource = ( unsigned long * ) pus; for( ulNextWord = 0; ulNextWord < ulNextTxSpace; ulNextWord += sizeof( unsigned long ) ) { HWREG(ETH_BASE + MAC_O_DATA) = *pulSource; pulSource++; } /* Go. */ HWREG( ETH_BASE + MAC_O_TR ) = MAC_TR_NEWTX; } /*-----------------------------------------------------------*/ void vEMAC_ISR( void ) { portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; unsigned long ulTemp; /* Clear the interrupt. */ ulTemp = EthernetIntStatus( ETH_BASE, pdFALSE ); EthernetIntClear( ETH_BASE, ulTemp ); /* Was it an Rx interrupt? */ if( ulTemp & ETH_INT_RX ) { xSemaphoreGiveFromISR( xMACInterruptSemaphore, &xHigherPriorityTaskWoken ); EthernetIntDisable( ETH_BASE, ETH_INT_RX ); } /* Switch to the uIP task. */ portEND_SWITCHING_ISR( xHigherPriorityTaskWoken ); } /*-----------------------------------------------------------*/ void vMACHandleTask( void *pvParameters ) { unsigned long i; unsigned long ulLength, ulInt; unsigned long *pulBuffer; static unsigned long ulNextRxBuffer = 0; for( ;; ) { /* Wait for something to do. */ xSemaphoreTake( xMACInterruptSemaphore, portMAX_DELAY ); while( ( ulInt = ( EthernetIntStatus( ETH_BASE, pdFALSE ) & ETH_INT_RX ) ) != 0 ) { ulLength = HWREG( ETH_BASE + MAC_O_DATA ); /* Leave room at the start of the buffer for the size. */ pulBuffer = ( unsigned long * ) &( ucRxBuffers[ ulNextRxBuffer ][ 2 ] ); *pulBuffer = ( ulLength >> 16 ); /* Get the size of the data. */ pulBuffer = ( unsigned long * ) &( ucRxBuffers[ ulNextRxBuffer ][ 4 ] ); ulLength &= 0xFFFF; if( ulLength > 4 ) { ulLength -= 4; if( ulLength >= UIP_BUFSIZE ) { /* The data won't fit in our buffer. Ensure we don't try to write into the buffer. */ ulLength = 0; } /* Read out the data into our buffer. */ for( i = 0; i < ulLength; i += sizeof( unsigned long ) ) { *pulBuffer = HWREG( ETH_BASE + MAC_O_DATA ); pulBuffer++; } /* Store the length of the data into the separate array. */ ulRxLength[ ulNextRxBuffer ] = ulLength; /* Use the next buffer the next time through. */ ulNextRxBuffer++; if( ulNextRxBuffer >= emacNUM_RX_BUFFERS ) { ulNextRxBuffer = 0; } /* Ensure the uIP task is not blocked as data has arrived. */ xSemaphoreGive( xEMACSemaphore ); } } EthernetIntEnable( ETH_BASE, ETH_INT_RX ); } }