/* | |
FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd. | |
*************************************************************************** | |
* * | |
* If you are: * | |
* * | |
* + New to FreeRTOS, * | |
* + Wanting to learn FreeRTOS or multitasking in general quickly * | |
* + Looking for basic training, * | |
* + Wanting to improve your FreeRTOS skills and productivity * | |
* * | |
* then take a look at the FreeRTOS books - available as PDF or paperback * | |
* * | |
* "Using the FreeRTOS Real Time Kernel - a Practical Guide" * | |
* http://www.FreeRTOS.org/Documentation * | |
* * | |
* A pdf reference manual is also available. Both are usually delivered * | |
* to your inbox within 20 minutes to two hours when purchased between 8am * | |
* and 8pm GMT (although please allow up to 24 hours in case of * | |
* exceptional circumstances). 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 exception 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 Richard Barry, contact details for whom are available on the | |
FreeRTOS WEB site. | |
1 tab == 4 spaces! | |
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 "task.h" | |
#include "semphr.h" | |
#include "SAM7_EMAC.h" | |
#include "AT91SAM7X256.h" | |
/*-----------------------------------------------------------*/ | |
/* The semaphore used to signal the arrival of new data to the interface | |
task. */ | |
static xSemaphoreHandle xSemaphore = NULL; | |
/* The interrupt entry point is naked so we can control the context saving. */ | |
void vEMACISR_Wrapper( void ) __attribute__((naked)); | |
/* The interrupt handler function must be separate from the entry function | |
to ensure the correct stack frame is set up. */ | |
void vEMACISR_Handler( void ); | |
/*-----------------------------------------------------------*/ | |
/* | |
* The EMAC ISR. Handles both Tx and Rx complete interrupts. | |
*/ | |
void vEMACISR_Handler( void ) | |
{ | |
volatile unsigned long ulIntStatus, ulEventStatus; | |
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
extern void vClearEMACTxBuffer( void ); | |
/* Find the cause of the interrupt. */ | |
ulIntStatus = AT91C_BASE_EMAC->EMAC_ISR; | |
ulEventStatus = AT91C_BASE_EMAC->EMAC_RSR; | |
if( ( ulIntStatus & AT91C_EMAC_RCOMP ) || ( ulEventStatus & AT91C_EMAC_REC ) ) | |
{ | |
/* A frame has been received, signal the lwIP task so it can process | |
the Rx descriptors. */ | |
xSemaphoreGiveFromISR( xSemaphore, &xHigherPriorityTaskWoken ); | |
AT91C_BASE_EMAC->EMAC_RSR = AT91C_EMAC_REC; | |
} | |
if( ulIntStatus & AT91C_EMAC_TCOMP ) | |
{ | |
/* A frame has been transmitted. Mark all the buffers used by the | |
frame just transmitted as free again. */ | |
vClearEMACTxBuffer(); | |
AT91C_BASE_EMAC->EMAC_TSR = AT91C_EMAC_COMP; | |
} | |
/* Clear the interrupt. */ | |
AT91C_BASE_AIC->AIC_EOICR = 0; | |
/* If a task was woken by either a frame being received then we may need to | |
switch to another task. If the unblocked task was of higher priority then | |
the interrupted task it will then execute immediately that the ISR | |
completes. */ | |
if( xHigherPriorityTaskWoken ) | |
{ | |
portYIELD_FROM_ISR(); | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
void vEMACISR_Wrapper( void ) | |
{ | |
/* Save the context of the interrupted task. */ | |
portSAVE_CONTEXT(); | |
/* Call the handler to do the work. This must be a separate | |
function to ensure the stack frame is set up correctly. */ | |
vEMACISR_Handler(); | |
/* Restore the context of whichever task will execute next. */ | |
portRESTORE_CONTEXT(); | |
} | |
/*-----------------------------------------------------------*/ | |
void vPassEMACSemaphore( xSemaphoreHandle xCreatedSemaphore ) | |
{ | |
/* Simply store the semaphore that should be used by the ISR. */ | |
xSemaphore = xCreatedSemaphore; | |
} | |