mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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138 lines
5.6 KiB
C
138 lines
5.6 KiB
C
/*
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FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
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* + Looking for basic training, *
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* + Wanting to improve your FreeRTOS skills and productivity *
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* *
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* then take a look at the FreeRTOS books - available as PDF or paperback *
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* *
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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* http://www.FreeRTOS.org/Documentation *
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* *
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* A pdf reference manual is also available. Both are usually delivered *
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
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* exceptional circumstances). Thank you for your support! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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***NOTE*** The exception to the GPL is included to allow you to distribute
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a combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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#include "FreeRTOS.h"
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#include "task.h"
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#include "semphr.h"
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#include "SAM7_EMAC.h"
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#include "AT91SAM7X256.h"
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/*-----------------------------------------------------------*/
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/* The semaphore used to signal the arrival of new data to the interface
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task. */
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static xSemaphoreHandle xSemaphore = NULL;
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/* The interrupt entry point is naked so we can control the context saving. */
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void vEMACISR_Wrapper( void ) __attribute__((naked));
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/* The interrupt handler function must be separate from the entry function
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to ensure the correct stack frame is set up. */
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void vEMACISR_Handler( void );
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/*-----------------------------------------------------------*/
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/*
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* The EMAC ISR. Handles both Tx and Rx complete interrupts.
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*/
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void vEMACISR_Handler( void )
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{
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volatile unsigned long ulIntStatus, ulEventStatus;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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extern void vClearEMACTxBuffer( void );
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/* Find the cause of the interrupt. */
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ulIntStatus = AT91C_BASE_EMAC->EMAC_ISR;
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ulEventStatus = AT91C_BASE_EMAC->EMAC_RSR;
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if( ( ulIntStatus & AT91C_EMAC_RCOMP ) || ( ulEventStatus & AT91C_EMAC_REC ) )
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{
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/* A frame has been received, signal the lwIP task so it can process
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the Rx descriptors. */
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xSemaphoreGiveFromISR( xSemaphore, &xHigherPriorityTaskWoken );
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AT91C_BASE_EMAC->EMAC_RSR = AT91C_EMAC_REC;
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}
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if( ulIntStatus & AT91C_EMAC_TCOMP )
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{
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/* A frame has been transmitted. Mark all the buffers used by the
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frame just transmitted as free again. */
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vClearEMACTxBuffer();
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AT91C_BASE_EMAC->EMAC_TSR = AT91C_EMAC_COMP;
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}
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/* Clear the interrupt. */
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AT91C_BASE_AIC->AIC_EOICR = 0;
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/* If a task was woken by either a frame being received then we may need to
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switch to another task. If the unblocked task was of higher priority then
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the interrupted task it will then execute immediately that the ISR
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completes. */
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if( xHigherPriorityTaskWoken )
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{
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portYIELD_FROM_ISR();
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}
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}
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/*-----------------------------------------------------------*/
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void vEMACISR_Wrapper( void )
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{
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/* Save the context of the interrupted task. */
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portSAVE_CONTEXT();
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/* Call the handler to do the work. This must be a separate
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function to ensure the stack frame is set up correctly. */
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vEMACISR_Handler();
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/* Restore the context of whichever task will execute next. */
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portRESTORE_CONTEXT();
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}
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/*-----------------------------------------------------------*/
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void vPassEMACSemaphore( xSemaphoreHandle xCreatedSemaphore )
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{
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/* Simply store the semaphore that should be used by the ISR. */
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xSemaphore = xCreatedSemaphore;
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}
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