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137 lines
5.7 KiB
C
137 lines
5.7 KiB
C
/*
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FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that has become a de facto standard. *
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* *
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* Help yourself get started quickly and support the FreeRTOS *
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* project by purchasing a FreeRTOS tutorial book, reference *
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* manual, or both from: http://www.FreeRTOS.org/Documentation *
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* *
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* Thank you! *
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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 modification to the GPL is included to allow you to !<<
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>>! distribute a combined work that includes FreeRTOS without being !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. Full license text is available from the following
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link: http://www.freertos.org/a00114.html
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?" *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and middleware.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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1 tab == 4 spaces!
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*/
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/* High speed timer test as described in main.c. */
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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/* The maximum value the 16bit timer can contain. */
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#define timerMAX_COUNT 0xffff
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/* The timer 2 interrupt handler. As this interrupt uses the FreeRTOS assembly
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entry point the IPL setting in the following function prototype has no effect.
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The interrupt priority is set by ConfigIntTimer2() in vSetupTimerTest(). */
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void __attribute__( (interrupt(ipl0), vector(_TIMER_2_VECTOR))) vT2InterruptWrapper( void );
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/*-----------------------------------------------------------*/
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/* Incremented every 20,000 interrupts, so should count in seconds. */
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unsigned long ulHighFrequencyTimerInterrupts = 0;
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/* The frequency at which the timer is interrupting. */
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static unsigned long ulFrequencyHz;
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/*-----------------------------------------------------------*/
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void vSetupTimerTest( unsigned short usFrequencyHz )
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{
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/* Remember the frequency so it can be used from the ISR. */
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ulFrequencyHz = ( unsigned long ) usFrequencyHz;
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/* T2 is used to generate interrupts above the kernel and max syscall interrupt
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priority. */
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T2CON = 0;
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TMR2 = 0;
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/* Timer 2 is going to interrupt at usFrequencyHz Hz. */
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PR2 = ( unsigned short ) ( ( configPERIPHERAL_CLOCK_HZ / ( unsigned long ) usFrequencyHz ) - 1 );
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/* Setup timer 2 interrupt priority to be above the kernel priority so
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the timer jitter is not effected by the kernel activity. */
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IPC2bits.T2IP = ( configMAX_SYSCALL_INTERRUPT_PRIORITY + 1 );
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/* Clear the interrupt as a starting condition. */
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IFS0bits.T2IF = 0;
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/* Enable the interrupt. */
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IEC0bits.T2IE = 1;
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/* Start the timer. */
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T2CONbits.TON = 1;
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}
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/*-----------------------------------------------------------*/
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void vT2InterruptHandler( void )
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{
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static unsigned long ulCalls = 0;
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++ulCalls;
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if( ulCalls >= ulFrequencyHz )
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{
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/* Increment the count that will be shown on the LCD.
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The increment occurs once every 20,000 interrupts so
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ulHighFrequencyTimerInterrupts should count in seconds. */
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ulHighFrequencyTimerInterrupts++;
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ulCalls = 0;
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}
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/* Clear the timer interrupt. */
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IFS0CLR = _IFS0_T2IF_MASK;
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}
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