/* | |
FreeRTOS.org V5.0.4 - Copyright (C) 2003-2008 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. | |
*************************************************************************** | |
*************************************************************************** | |
* * | |
* SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, * | |
* and even write all or part of your application on your behalf. * | |
* See http://www.OpenRTOS.com for details of the services we provide to * | |
* expedite your project. * | |
* * | |
*************************************************************************** | |
*************************************************************************** | |
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(); | |
} | |