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181 lines
7.3 KiB
C
181 lines
7.3 KiB
C
/*
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FreeRTOS V9.0.0 - Copyright (C) 2016 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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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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***************************************************************************
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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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***************************************************************************
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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 on the following
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link: http://www.freertos.org/a00114.html
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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 is more than just the market leader, it *
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* is the industry's de facto standard. *
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* *
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* Help yourself get started quickly while simultaneously helping *
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* to support the FreeRTOS project by purchasing a FreeRTOS *
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* tutorial book, reference manual, or both: *
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* http://www.FreeRTOS.org/Documentation *
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* *
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***************************************************************************
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http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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the FAQ page "My application does not run, what could be wrong?". Have you
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defined configASSERT()?
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http://www.FreeRTOS.org/support - In return for receiving this top quality
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embedded software for free we request you assist our global community by
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participating in the support forum.
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http://www.FreeRTOS.org/training - Investing in training allows your team to
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be as productive as possible as early as possible. Now you can receive
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FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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Ltd, and the world's leading authority on the world's leading RTOS.
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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.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and commercial 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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/* Library includes. */
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#include "hw_ints.h"
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#include "hw_memmap.h"
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#include "hw_types.h"
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#include "interrupt.h"
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#include "sysctl.h"
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#include "lmi_timer.h"
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/* The set frequency of the interrupt. Deviations from this are measured as
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the jitter. */
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#define timerINTERRUPT_FREQUENCY ( 20000UL )
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/* The expected time between each of the timer interrupts - if the jitter was
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zero. */
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#define timerEXPECTED_DIFFERENCE_VALUE ( configCPU_CLOCK_HZ / timerINTERRUPT_FREQUENCY )
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/* The highest available interrupt priority. */
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#define timerHIGHEST_PRIORITY ( 0 )
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/* Misc defines. */
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#define timerMAX_32BIT_VALUE ( 0xffffffffUL )
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#define timerTIMER_1_COUNT_VALUE ( * ( ( unsigned long * ) ( TIMER1_BASE + 0x48 ) ) )
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/*-----------------------------------------------------------*/
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/* Interrupt handler in which the jitter is measured. */
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void Timer0IntHandler( void );
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/* Stores the value of the maximum recorded jitter between interrupts. */
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volatile unsigned long ulMaxJitter = 0UL;
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/* Counts the total number of times that the high frequency timer has 'ticked'.
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This value is used by the run time stats function to work out what percentage
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of CPU time each task is taking. */
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volatile unsigned long ulHighFrequencyTimerTicks = 0UL;
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/*-----------------------------------------------------------*/
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void vSetupHighFrequencyTimer( void )
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{
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unsigned long ulFrequency;
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/* Timer zero is used to generate the interrupts, and timer 1 is used
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to measure the jitter. */
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SysCtlPeripheralEnable( SYSCTL_PERIPH_TIMER0 );
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SysCtlPeripheralEnable( SYSCTL_PERIPH_TIMER1 );
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TimerConfigure( TIMER0_BASE, TIMER_CFG_32_BIT_PER );
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TimerConfigure( TIMER1_BASE, TIMER_CFG_32_BIT_PER );
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/* Set the timer interrupt to be above the kernel - highest. */
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IntPrioritySet( INT_TIMER0A, timerHIGHEST_PRIORITY );
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/* Just used to measure time. */
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TimerLoadSet(TIMER1_BASE, TIMER_A, timerMAX_32BIT_VALUE );
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/* Ensure interrupts do not start until the scheduler is running. */
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portDISABLE_INTERRUPTS();
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/* The rate at which the timer will interrupt. */
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ulFrequency = configCPU_CLOCK_HZ / timerINTERRUPT_FREQUENCY;
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TimerLoadSet( TIMER0_BASE, TIMER_A, ulFrequency );
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IntEnable( INT_TIMER0A );
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TimerIntEnable( TIMER0_BASE, TIMER_TIMA_TIMEOUT );
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/* Enable both timers. */
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TimerEnable( TIMER0_BASE, TIMER_A );
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TimerEnable( TIMER1_BASE, TIMER_A );
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}
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/*-----------------------------------------------------------*/
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void Timer0IntHandler( void )
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{
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unsigned long ulDifference;
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volatile unsigned long ulCurrentCount;
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static unsigned long ulMaxDifference = 0, ulLastCount = 0;
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/* We use the timer 1 counter value to measure the clock cycles between
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the timer 0 interrupts. */
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ulCurrentCount = timerTIMER_1_COUNT_VALUE;
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TimerIntClear( TIMER0_BASE, TIMER_TIMA_TIMEOUT );
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if( ulCurrentCount < ulLastCount )
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{
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/* How many times has timer 1 counted since the last interrupt? */
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ulDifference = ulLastCount - ulCurrentCount;
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/* Is this the largest difference we have measured yet? */
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if( ulDifference > ulMaxDifference )
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{
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ulMaxDifference = ulDifference;
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ulMaxJitter = ulMaxDifference - timerEXPECTED_DIFFERENCE_VALUE;
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}
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}
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ulLastCount = ulCurrentCount;
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/* Keep a count of the total number of 20KHz ticks. This is used by the
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run time stats functionality to calculate how much CPU time is used by
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each task. */
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ulHighFrequencyTimerTicks++;
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}
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