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189 lines
7.0 KiB
C
189 lines
7.0 KiB
C
/*
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FreeRTOS V9.0.0rc2 - 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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/*
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* High frequency timer test as described in main.c.
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*/
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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/* Hardware specifics. */
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#include "iodefine.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 ( ( unsigned short ) ( ( configPERIPHERAL_CLOCK_HZ / 8UL ) / timerINTERRUPT_FREQUENCY ) )
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/* The highest available interrupt priority. */
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#define timerHIGHEST_PRIORITY ( 15 )
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/* Misc defines. */
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#define timerTIMER_3_COUNT_VALUE ( *( ( unsigned short * ) 0x8801a ) ) /*( CMT3.CMCNT )*/
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/*-----------------------------------------------------------*/
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/* Interrupt handler in which the jitter is measured. */
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void vTimer2_ISR_Handler( void ) __attribute__((interrupt));
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/* Stores the value of the maximum recorded jitter between interrupts. This is
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displayed on one of the served web pages. */
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volatile unsigned short usMaxJitter = 0;
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/* Counts the number of high frequency interrupts - used to generate the run
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time stats. */
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volatile unsigned long ulHighFrequencyTickCount = 0UL;
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/*-----------------------------------------------------------*/
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void vSetupHighFrequencyTimer( void )
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{
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/* Timer CMT2 is used to generate the interrupts, and CMT3 is used
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to measure the jitter. */
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/* Enable compare match timer 2 and 3. */
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MSTP( CMT2 ) = 0;
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MSTP( CMT3 ) = 0;
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/* Interrupt on compare match. */
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CMT2.CMCR.BIT.CMIE = 1;
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/* Set the compare match value. */
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CMT2.CMCOR = ( unsigned short ) ( ( ( configPERIPHERAL_CLOCK_HZ / timerINTERRUPT_FREQUENCY ) -1 ) / 8 );
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/* Divide the PCLK by 8. */
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CMT2.CMCR.BIT.CKS = 0;
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CMT3.CMCR.BIT.CKS = 0;
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/* Enable the interrupt... */
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_IEN( _CMT2_CMI2 ) = 1;
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/* ...and set its priority to the maximum possible, this is above the priority
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set by configMAX_SYSCALL_INTERRUPT_PRIORITY so will nest. */
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_IPR( _CMT2_CMI2 ) = timerHIGHEST_PRIORITY;
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/* Start the timers. */
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CMT.CMSTR1.BIT.STR2 = 1;
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CMT.CMSTR1.BIT.STR3 = 1;
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}
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/*-----------------------------------------------------------*/
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void vTimer2_ISR_Handler( void )
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{
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volatile unsigned short usCurrentCount;
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static unsigned short usMaxCount = 0;
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static unsigned long ulErrorCount = 0UL;
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/* This is the highest priority interrupt in the system, so there is no
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advantage to re-enabling interrupts here.
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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. First stop the clock. */
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CMT.CMSTR1.BIT.STR3 = 0;
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portNOP();
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portNOP();
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usCurrentCount = timerTIMER_3_COUNT_VALUE;
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/* Is this the largest count we have measured yet? */
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if( usCurrentCount > usMaxCount )
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{
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if( usCurrentCount > timerEXPECTED_DIFFERENCE_VALUE )
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{
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usMaxJitter = usCurrentCount - timerEXPECTED_DIFFERENCE_VALUE;
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}
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else
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{
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/* This should not happen! */
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ulErrorCount++;
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}
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usMaxCount = usCurrentCount;
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}
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/* Used to generate the run time stats. */
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ulHighFrequencyTickCount++;
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/* Clear the timer. */
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timerTIMER_3_COUNT_VALUE = 0;
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/* Then start the clock again. */
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CMT.CMSTR1.BIT.STR3 = 1;
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}
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