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/*
FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 Richard Barry.
This file is part of the FreeRTOS.org distribution.
FreeRTOS.org is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FreeRTOS.org 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
along with FreeRTOS.org; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes FreeRTOS.org, without being obliged to provide
the source code for any proprietary components. See the licensing section
of http://www.FreeRTOS.org for full details of how and when the exception
can be applied.
***************************************************************************
***************************************************************************
* *
* Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
* *
* This is a concise, step by step, 'hands on' guide that describes both *
* general multitasking concepts and FreeRTOS specifics. It presents and *
* explains numerous examples that are written using the FreeRTOS API. *
* Full source code for all the examples is provided in an accompanying *
* .zip file. *
* *
***************************************************************************
***************************************************************************
Please ensure to read the configuration and relevant port sections of the
online documentation.
http://www.FreeRTOS.org - Documentation, latest information, license and
contact details.
http://www.SafeRTOS.com - A version that is certified for use in safety
critical systems.
http://www.OpenRTOS.com - Commercial support, development, porting,
licensing and training services.
*/
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
/* Constants required for interrupt management. */
#define tcpCLEAR_VIC_INTERRUPT ( 0 )
#define tcpEINT0_VIC_CHANNEL_BIT ( ( unsigned portLONG ) 0x4000 )
/* EINT0 interrupt handler. This processes interrupts from the WIZnet device. */
void vEINT0_ISR_Wrapper( void ) __attribute__((naked));
/* The handler that goes with the EINT0 wrapper. */
void vEINT0_ISR_Handler( void );
/* Variable is required for its address, but does not otherwise get used. */
static portLONG lDummyVariable;
/*
* When the WIZnet device asserts an interrupt we send an (empty) message to
* the TCP task. This wakes the task so the interrupt can be processed. The
* source of the interrupt has to be ascertained by the TCP task as this
* requires an I2C transaction which cannot be performed from this ISR.
* Note this code predates the introduction of semaphores, a semaphore should
* be used in place of the empty queue message.
*/
void vEINT0_ISR_Handler( void )
{
extern xQueueHandle xTCPISRQueue;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
/* Just wake the TCP task so it knows an ISR has occurred. */
xQueueSendFromISR( xTCPISRQueue, ( void * ) &lDummyVariable, &xHigherPriorityTaskWoken );
/* We cannot carry on processing interrupts until the TCP task has
processed this one - so for now interrupts are disabled. The TCP task will
re-enable it. */
VICIntEnClear |= tcpEINT0_VIC_CHANNEL_BIT;
/* Clear the interrupt bit. */
VICVectAddr = tcpCLEAR_VIC_INTERRUPT;
if( xHigherPriorityTaskWoken )
{
portYIELD_FROM_ISR();
}
}
/*-----------------------------------------------------------*/
void vEINT0_ISR_Wrapper( void )
{
/* Save the context of the interrupted task. */
portSAVE_CONTEXT();
/* The handler must be a separate function from the wrapper to
ensure the correct stack frame is set up. */
vEINT0_ISR_Handler();
/* Restore the context of whichever task is going to run next. */
portRESTORE_CONTEXT();
}
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