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204 lines
8.0 KiB
C
204 lines
8.0 KiB
C
/*
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FreeRTOS V9.0.0rc1 - 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 "stm32f10x_lib.h"
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#include "stm32f10x_tim.h"
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#include "stm32f10x_map.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 ( ( unsigned short ) 20000 )
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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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/* The number of interrupts to pass before we start looking at the jitter. */
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#define timerSETTLE_TIME 5
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/*-----------------------------------------------------------*/
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/*
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* Configures the two timers used to perform the test.
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*/
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void vSetupTimerTest( void );
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/* Interrupt handler in which the jitter is measured. */
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void vTimer2IntHandler( void );
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/* Stores the value of the maximum recorded jitter between interrupts. */
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volatile unsigned short usMaxJitter = 0;
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/*-----------------------------------------------------------*/
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void vSetupTimerTest( void )
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{
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unsigned long ulFrequency;
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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/* Enable timer clocks */
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RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2, ENABLE );
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RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM3, ENABLE );
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/* Initialise data. */
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TIM_DeInit( TIM2 );
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TIM_DeInit( TIM3 );
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TIM_TimeBaseStructInit( &TIM_TimeBaseStructure );
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/* Time base configuration for timer 2 - which generates the interrupts. */
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ulFrequency = configCPU_CLOCK_HZ / timerINTERRUPT_FREQUENCY;
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TIM_TimeBaseStructure.TIM_Period = ( unsigned short ) ( ulFrequency & 0xffffUL );
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TIM_TimeBaseStructure.TIM_Prescaler = 0x0;
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TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit( TIM2, &TIM_TimeBaseStructure );
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TIM_ARRPreloadConfig( TIM2, ENABLE );
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/* Configuration for timer 3 which is used as a high resolution time
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measurement. */
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TIM_TimeBaseStructure.TIM_Period = ( unsigned short ) 0xffff;
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TIM_TimeBaseInit( TIM3, &TIM_TimeBaseStructure );
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TIM_ARRPreloadConfig( TIM3, ENABLE );
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/* Enable TIM2 IT. TIM3 does not generate an interrupt. */
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NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = timerHIGHEST_PRIORITY;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init( &NVIC_InitStructure );
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TIM_ITConfig( TIM2, TIM_IT_Update, ENABLE );
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/* Finally, enable both timers. */
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TIM_Cmd( TIM2, ENABLE );
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TIM_Cmd( TIM3, ENABLE );
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}
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/*-----------------------------------------------------------*/
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void vTimer2IntHandler( void )
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{
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static unsigned short usLastCount = 0, usSettleCount = 0, usMaxDifference = 0;
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unsigned short usThisCount, usDifference;
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/* Capture the free running timer 3 value as we enter the interrupt. */
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usThisCount = TIM3->CNT;
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if( usSettleCount >= timerSETTLE_TIME )
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{
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/* What is the difference between the timer value in this interrupt
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and the value from the last interrupt. */
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usDifference = usThisCount - usLastCount;
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/* Store the difference in the timer values if it is larger than the
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currently stored largest value. The difference over and above the
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expected difference will give the 'jitter' in the processing of these
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interrupts. */
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if( usDifference > usMaxDifference )
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{
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usMaxDifference = usDifference;
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usMaxJitter = usMaxDifference - timerEXPECTED_DIFFERENCE_VALUE;
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}
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}
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else
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{
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/* Don't bother storing any values for the first couple of
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interrupts. */
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usSettleCount++;
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}
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/* Remember what the timer value was this time through, so we can calculate
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the difference the next time through. */
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usLastCount = usThisCount;
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TIM_ClearITPendingBit( TIM2, TIM_IT_Update );
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}
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