2 FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 ***************************************************************************
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29 * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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31 * This is a concise, step by step, 'hands on' guide that describes both *
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32 * general multitasking concepts and FreeRTOS specifics. It presents and *
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33 * explains numerous examples that are written using the FreeRTOS API. *
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34 * Full source code for all the examples is provided in an accompanying *
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37 ***************************************************************************
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38 ***************************************************************************
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40 Please ensure to read the configuration and relevant port sections of the
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41 online documentation.
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43 http://www.FreeRTOS.org - Documentation, latest information, license and
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46 http://www.SafeRTOS.com - A version that is certified for use in safety
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49 http://www.OpenRTOS.com - Commercial support, development, porting,
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50 licensing and training services.
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53 /* Scheduler include files. */
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54 #include "FreeRTOS.h"
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58 /* Constants required for interrupt management. */
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59 #define tcpCLEAR_VIC_INTERRUPT ( 0 )
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60 #define tcpEINT0_VIC_CHANNEL_BIT ( ( unsigned portLONG ) 0x4000 )
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62 /* EINT0 interrupt handler. This processes interrupts from the WIZnet device. */
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63 void vEINT0_ISR_Wrapper( void ) __attribute__((naked));
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65 /* The handler that goes with the EINT0 wrapper. */
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66 void vEINT0_ISR_Handler( void );
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68 /* Variable is required for its address, but does not otherwise get used. */
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69 static portLONG lDummyVariable;
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72 * When the WIZnet device asserts an interrupt we send an (empty) message to
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73 * the TCP task. This wakes the task so the interrupt can be processed. The
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74 * source of the interrupt has to be ascertained by the TCP task as this
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75 * requires an I2C transaction which cannot be performed from this ISR.
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76 * Note this code predates the introduction of semaphores, a semaphore should
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77 * be used in place of the empty queue message.
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79 void vEINT0_ISR_Handler( void )
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81 extern xQueueHandle xTCPISRQueue;
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82 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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84 /* Just wake the TCP task so it knows an ISR has occurred. */
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85 xQueueSendFromISR( xTCPISRQueue, ( void * ) &lDummyVariable, &xHigherPriorityTaskWoken );
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87 /* We cannot carry on processing interrupts until the TCP task has
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88 processed this one - so for now interrupts are disabled. The TCP task will
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90 VICIntEnClear |= tcpEINT0_VIC_CHANNEL_BIT;
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92 /* Clear the interrupt bit. */
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93 VICVectAddr = tcpCLEAR_VIC_INTERRUPT;
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95 if( xHigherPriorityTaskWoken )
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97 portYIELD_FROM_ISR();
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100 /*-----------------------------------------------------------*/
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102 void vEINT0_ISR_Wrapper( void )
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104 /* Save the context of the interrupted task. */
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105 portSAVE_CONTEXT();
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107 /* The handler must be a separate function from the wrapper to
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108 ensure the correct stack frame is set up. */
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109 vEINT0_ISR_Handler();
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111 /* Restore the context of whichever task is going to run next. */
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112 portRESTORE_CONTEXT();
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