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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.
*/
#include "FreeRTOS.h"
#include "semphr.h"
#include "task.h"
/* Wrapper for the EMAC interrupt. */
void vEMACISR_Wrapper( void ) __attribute__((naked));
/* Handler called by the ISR wrapper. This must be kept a separate
function to ensure the stack frame is correctly set up. */
void vEMACISR_Handler( void );
static xSemaphoreHandle xEMACSemaphore;
/*-----------------------------------------------------------*/
void vPassEMACSemaphore( xSemaphoreHandle xSemaphore )
{
xEMACSemaphore = xSemaphore;
}
/*-----------------------------------------------------------*/
void vEMACISR_Handler( void )
{
volatile unsigned portLONG ulIntStatus, ulRxStatus;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
ulIntStatus = AT91C_BASE_EMAC->EMAC_ISR;
ulRxStatus = AT91C_BASE_EMAC->EMAC_RSR;
if( ( ulIntStatus & AT91C_EMAC_RCOMP ) || ( ulRxStatus & AT91C_EMAC_REC ) )
{
/* A frame has been received, signal the uIP task so it can process
the Rx descriptors. */
xSemaphoreGiveFromISR( xEMACSemaphore, &xHigherPriorityTaskWoken );
AT91C_BASE_EMAC->EMAC_RSR = AT91C_EMAC_REC;
}
/* Clear the interrupt. */
AT91C_BASE_AIC->AIC_EOICR = 0;
/* Switch to the uIP task. */
if( xHigherPriorityTaskWoken )
{
/* If a task of higher priority than the interrupted task was
unblocked by the ISR then this call will ensure that the
unblocked task is the task the ISR returns to. */
portYIELD_FROM_ISR();
}
}
/*-----------------------------------------------------------*/
void vEMACISR_Wrapper( void )
{
/* Save the context of the interrupted task. */
portSAVE_CONTEXT();
/* Call the handler task to do the actual work. This must be a separate
function to ensure the stack frame is correctly set up. */
vEMACISR_Handler();
/* Restore the context of whichever task is the next to run. */
portRESTORE_CONTEXT();
}
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