20100923-V6.1.0-RC2/Demo/PIC32MX_MPLAB/IntQueueTimer.c

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+/*
+    FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd.
+
+    ***************************************************************************
+    *                                                                         *
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+    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
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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 "IntQueueTimer.h"
+#include "IntQueue.h"
+
+#define timerINTERRUPT3_FREQUENCY	( 2000UL )
+#define timerINTERRUPT4_FREQUENCY	( 2001UL )
+
+void vT3InterruptHandler( void );
+void vT4InterruptHandler( void );
+
+void __attribute__( (interrupt(ipl0), vector(_TIMER_3_VECTOR))) vT3InterruptWrapper( void );
+void __attribute__( (interrupt(ipl0), vector(_TIMER_4_VECTOR))) vT4InterruptWrapper( void );
+
+void vInitialiseTimerForIntQueueTest( void )
+{
+	/* Timer 1 is used for the tick interrupt, timer 2 is used for the high
+	frequency interrupt test.  This file therefore uses timers 3 and 4. */
+
+	T3CON = 0;
+	TMR3 = 0;
+	PR3 = ( unsigned portSHORT ) ( configPERIPHERAL_CLOCK_HZ / timerINTERRUPT3_FREQUENCY );
+
+	/* Setup timer 3 interrupt priority to be above the kernel priority. */
+	ConfigIntTimer3( T3_INT_ON | ( configMAX_SYSCALL_INTERRUPT_PRIORITY - 1 ) );
+
+	/* Clear the interrupt as a starting condition. */
+	IFS0bits.T3IF = 0;
+
+	/* Enable the interrupt. */
+	IEC0bits.T3IE = 1;
+
+	/* Start the timer. */
+	T3CONbits.TON = 1;
+
+
+	/* Do the same for timer 4. */
+	T4CON = 0;
+	TMR4 = 0;
+	PR4 = ( unsigned portSHORT ) ( configPERIPHERAL_CLOCK_HZ / timerINTERRUPT4_FREQUENCY );
+
+	/* Setup timer 4 interrupt priority to be above the kernel priority. */
+	ConfigIntTimer4( T4_INT_ON | ( configMAX_SYSCALL_INTERRUPT_PRIORITY ) );
+
+	/* Clear the interrupt as a starting condition. */
+	IFS0bits.T4IF = 0;
+
+	/* Enable the interrupt. */
+	IEC0bits.T4IE = 1;
+
+	/* Start the timer. */
+	T4CONbits.TON = 1;
+}
+/*-----------------------------------------------------------*/
+
+void vT3InterruptHandler( void )
+{
+	IFS0bits.T3IF = 0;
+	portEND_SWITCHING_ISR( xFirstTimerHandler() );
+}
+/*-----------------------------------------------------------*/
+
+void vT4InterruptHandler( void )
+{
+	IFS0bits.T4IF = 0;
+	portEND_SWITCHING_ISR( xSecondTimerHandler() );
+}
+
+