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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM7_LPC2138_Rowley/] [mainISR.c] - Blame information for rev 577

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1 577 jeremybenn
/*
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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 "semphr.h"
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#define isrCLEAR_EINT_1 2
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/*
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 * Interrupt routine that simply wakes vButtonHandlerTask on each interrupt
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 * generated by a push of the built in button.  The wrapper takes care of
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 * the ISR entry.  This then calls the actual handler function to perform
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 * the work.  This work should not be done in the wrapper itself unless
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 * you are absolutely sure that no stack space is used.
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 */
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void vButtonISRWrapper( void ) __attribute__ ((naked));
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void vButtonHandler( void ) __attribute__ ((noinline));
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void vButtonHandler( void )
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{
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extern xSemaphoreHandle xButtonSemaphore;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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        xSemaphoreGiveFromISR( xButtonSemaphore, &xHigherPriorityTaskWoken );
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        if( xHigherPriorityTaskWoken )
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        {
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                /* We have woken a task.  Calling "yield from ISR" here will ensure
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                the interrupt returns to the woken task if it has a priority higher
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                than the interrupted task. */
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                portYIELD_FROM_ISR();
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        }
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    EXTINT = isrCLEAR_EINT_1;
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    VICVectAddr = 0;
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}
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/*-----------------------------------------------------------*/
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void vButtonISRWrapper( 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 function to
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        the wrapper to ensure the correct stack frame is set up. */
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        __asm volatile( "bl vButtonHandler" );
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        /* Restore the context of whichever task is going to run once the interrupt
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        completes. */
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        portRESTORE_CONTEXT();
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}
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