20100923-V6.1.0-RC2/Demo/ARM7_LPC2138_Rowley/mainISR.c

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+/*
+    FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd.
+
+    ***************************************************************************
+    *                                                                         *
+    * If you are:                                                             *
+    *                                                                         *
+    *    + New to FreeRTOS,                                                   *
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+    *                                                                         *
+    * then take a look at the FreeRTOS books - available as PDF or paperback  *
+    *                                                                         *
+    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
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+    *                                                                         *
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+    * 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            *
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+    *                                                                         *
+    ***************************************************************************
+
+    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 "semphr.h"
+
+#define isrCLEAR_EINT_1 2
+
+/*
+ * Interrupt routine that simply wakes vButtonHandlerTask on each interrupt 
+ * generated by a push of the built in button.  The wrapper takes care of
+ * the ISR entry.  This then calls the actual handler function to perform
+ * the work.  This work should not be done in the wrapper itself unless
+ * you are absolutely sure that no stack space is used.
+ */
+void vButtonISRWrapper( void ) __attribute__ ((naked));
+void vButtonHandler( void ) __attribute__ ((noinline));
+
+void vButtonHandler( void )
+{
+extern xSemaphoreHandle xButtonSemaphore;
+portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
+
+	xSemaphoreGiveFromISR( xButtonSemaphore, &xHigherPriorityTaskWoken );
+
+	if( xHigherPriorityTaskWoken )
+	{
+		/* We have woken a task.  Calling "yield from ISR" here will ensure
+		the interrupt returns to the woken task if it has a priority higher
+		than the interrupted task. */
+		portYIELD_FROM_ISR();
+	}
+
+    EXTINT = isrCLEAR_EINT_1;
+    VICVectAddr = 0;
+}
+/*-----------------------------------------------------------*/
+
+void vButtonISRWrapper( void )
+{
+	/* Save the context of the interrupted task. */
+	portSAVE_CONTEXT();
+
+	/* Call the handler to do the work.  This must be a separate function to
+	the wrapper to ensure the correct stack frame is set up. */
+	__asm volatile( "bl vButtonHandler" );
+
+	/* Restore the context of whichever task is going to run once the interrupt
+	completes. */
+	portRESTORE_CONTEXT();
+}
+
+
+