Introduce sp_flop.c. This is the same as the flop.c common demo file, but uses single precision numbers and variables in place of the double precision numbers and variables.
Richard Barry
14 years ago
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/*
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FreeRTOS V7.0.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* FreeRTOS tutorial books are available in pdf and paperback. *
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* Complete, revised, and edited pdf reference manuals are also *
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* available. *
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* *
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* Purchasing FreeRTOS documentation will not only help you, by *
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* ensuring you get running as quickly as possible and with an *
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* in-depth knowledge of how to use FreeRTOS, it will also help *
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* the FreeRTOS project to continue with its mission of providing *
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* professional grade, cross platform, de facto standard solutions *
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* for microcontrollers - completely free of charge! *
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* *
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* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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* *
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* Thank you for using FreeRTOS, and thank you for your support! *
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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 obliged to
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provide the source code for proprietary components outside of the FreeRTOS
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kernel. FreeRTOS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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/*
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* Creates eight tasks, each of which loops continuously performing a floating
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* point calculation - using single precision variables.
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*
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* All the tasks run at the idle priority and never block or yield. This causes
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* all eight tasks to time slice with the idle task. Running at the idle priority
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* means that these tasks will get pre-empted any time another task is ready to run
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* or a time slice occurs. More often than not the pre-emption will occur mid
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* calculation, creating a good test of the schedulers context switch mechanism - a
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* calculation producing an unexpected result could be a symptom of a corruption in
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* the context of a task.
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*/
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#include <stdlib.h>
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#include <math.h>
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "task.h"
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/* Demo program include files. */
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#include "flop.h"
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#define mathSTACK_SIZE configMINIMAL_STACK_SIZE
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#define mathNUMBER_OF_TASKS ( 8 )
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/* Four tasks, each of which performs a different floating point calculation.
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Each of the four is created twice. */
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static portTASK_FUNCTION_PROTO( vCompetingMathTask1, pvParameters );
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static portTASK_FUNCTION_PROTO( vCompetingMathTask2, pvParameters );
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static portTASK_FUNCTION_PROTO( vCompetingMathTask3, pvParameters );
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static portTASK_FUNCTION_PROTO( vCompetingMathTask4, pvParameters );
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/* These variables are used to check that all the tasks are still running. If a
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task gets a calculation wrong it will
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stop incrementing its check variable. */
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static volatile unsigned short usTaskCheck[ mathNUMBER_OF_TASKS ] = { ( unsigned short ) 0 };
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/*-----------------------------------------------------------*/
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void vStartMathTasks( unsigned portBASE_TYPE uxPriority )
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{
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xTaskCreate( vCompetingMathTask1, ( signed char * ) "Math1", mathSTACK_SIZE, ( void * ) &( usTaskCheck[ 0 ] ), uxPriority, NULL );
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xTaskCreate( vCompetingMathTask2, ( signed char * ) "Math2", mathSTACK_SIZE, ( void * ) &( usTaskCheck[ 1 ] ), uxPriority, NULL );
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xTaskCreate( vCompetingMathTask3, ( signed char * ) "Math3", mathSTACK_SIZE, ( void * ) &( usTaskCheck[ 2 ] ), uxPriority, NULL );
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xTaskCreate( vCompetingMathTask4, ( signed char * ) "Math4", mathSTACK_SIZE, ( void * ) &( usTaskCheck[ 3 ] ), uxPriority, NULL );
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xTaskCreate( vCompetingMathTask1, ( signed char * ) "Math5", mathSTACK_SIZE, ( void * ) &( usTaskCheck[ 4 ] ), uxPriority, NULL );
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xTaskCreate( vCompetingMathTask2, ( signed char * ) "Math6", mathSTACK_SIZE, ( void * ) &( usTaskCheck[ 5 ] ), uxPriority, NULL );
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xTaskCreate( vCompetingMathTask3, ( signed char * ) "Math7", mathSTACK_SIZE, ( void * ) &( usTaskCheck[ 6 ] ), uxPriority, NULL );
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xTaskCreate( vCompetingMathTask4, ( signed char * ) "Math8", mathSTACK_SIZE, ( void * ) &( usTaskCheck[ 7 ] ), uxPriority, NULL );
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}
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/*-----------------------------------------------------------*/
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static portTASK_FUNCTION( vCompetingMathTask1, pvParameters )
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{
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volatile float f1, f2, f3, f4;
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volatile unsigned short *pusTaskCheckVariable;
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volatile float fAnswer;
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short sError = pdFALSE;
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f1 = 123.4567F;
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f2 = 2345.6789F;
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f3 = -918.222F;
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fAnswer = ( f1 + f2 ) * f3;
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/* The variable this task increments to show it is still running is passed in
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as the parameter. */
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pusTaskCheckVariable = ( unsigned short * ) pvParameters;
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/* Keep performing a calculation and checking the result against a constant. */
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for(;;)
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{
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f1 = 123.4567F;
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f2 = 2345.6789F;
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f3 = -918.222F;
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f4 = ( f1 + f2 ) * f3;
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#if configUSE_PREEMPTION == 0
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taskYIELD();
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#endif
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/* If the calculation does not match the expected constant, stop the
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increment of the check variable. */
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if( fabs( f4 - fAnswer ) > 0.001F )
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{
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sError = pdTRUE;
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}
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if( sError == pdFALSE )
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{
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/* If the calculation has always been correct, increment the check
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variable so we know this task is still running okay. */
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( *pusTaskCheckVariable )++;
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}
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#if configUSE_PREEMPTION == 0
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taskYIELD();
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#endif
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}
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}
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/*-----------------------------------------------------------*/
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static portTASK_FUNCTION( vCompetingMathTask2, pvParameters )
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{
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volatile float f1, f2, f3, f4;
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volatile unsigned short *pusTaskCheckVariable;
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volatile float fAnswer;
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short sError = pdFALSE;
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f1 = -389.38F;
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f2 = 32498.2F;
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f3 = -2.0001F;
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fAnswer = ( f1 / f2 ) * f3;
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/* The variable this task increments to show it is still running is passed in
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as the parameter. */
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pusTaskCheckVariable = ( unsigned short * ) pvParameters;
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/* Keep performing a calculation and checking the result against a constant. */
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for( ;; )
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{
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f1 = -389.38F;
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f2 = 32498.2F;
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f3 = -2.0001F;
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f4 = ( f1 / f2 ) * f3;
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#if configUSE_PREEMPTION == 0
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taskYIELD();
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#endif
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/* If the calculation does not match the expected constant, stop the
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increment of the check variable. */
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if( fabs( f4 - fAnswer ) > 0.001F )
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{
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sError = pdTRUE;
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}
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if( sError == pdFALSE )
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{
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/* If the calculation has always been correct, increment the check
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variable so we know
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this task is still running okay. */
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( *pusTaskCheckVariable )++;
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}
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#if configUSE_PREEMPTION == 0
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taskYIELD();
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#endif
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}
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}
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/*-----------------------------------------------------------*/
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static portTASK_FUNCTION( vCompetingMathTask3, pvParameters )
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{
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volatile float *pfArray, fTotal1, fTotal2, fDifference, fPosition;
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volatile unsigned short *pusTaskCheckVariable;
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const size_t xArraySize = 10;
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size_t xPosition;
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short sError = pdFALSE;
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/* The variable this task increments to show it is still running is passed in
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as the parameter. */
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pusTaskCheckVariable = ( unsigned short * ) pvParameters;
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pfArray = ( float * ) pvPortMalloc( xArraySize * sizeof( float ) );
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/* Keep filling an array, keeping a running total of the values placed in the
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array. Then run through the array adding up all the values. If the two totals
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do not match, stop the check variable from incrementing. */
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for( ;; )
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{
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fTotal1 = 0.0F;
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fTotal2 = 0.0F;
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fPosition = 0.0F;
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for( xPosition = 0; xPosition < xArraySize; xPosition++ )
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{
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pfArray[ xPosition ] = fPosition + 5.5F;
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fTotal1 += fPosition + 5.5F;
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}
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#if configUSE_PREEMPTION == 0
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taskYIELD();
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#endif
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for( xPosition = 0; xPosition < xArraySize; xPosition++ )
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{
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fTotal2 += pfArray[ xPosition ];
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}
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fDifference = fTotal1 - fTotal2;
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if( fabs( fDifference ) > 0.001F )
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{
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sError = pdTRUE;
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}
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#if configUSE_PREEMPTION == 0
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taskYIELD();
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#endif
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if( sError == pdFALSE )
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{
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/* If the calculation has always been correct, increment the check
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variable so we know this task is still running okay. */
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( *pusTaskCheckVariable )++;
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}
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}
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}
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/*-----------------------------------------------------------*/
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static portTASK_FUNCTION( vCompetingMathTask4, pvParameters )
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{
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volatile float *pfArray, fTotal1, fTotal2, fDifference, fPosition;
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volatile unsigned short *pusTaskCheckVariable;
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const size_t xArraySize = 10;
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size_t xPosition;
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short sError = pdFALSE;
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/* The variable this task increments to show it is still running is passed in
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as the parameter. */
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pusTaskCheckVariable = ( unsigned short * ) pvParameters;
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pfArray = ( float * ) pvPortMalloc( xArraySize * sizeof( float ) );
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/* Keep filling an array, keeping a running total of the values placed in the
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array. Then run through the array adding up all the values. If the two totals
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do not match, stop the check variable from incrementing. */
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for( ;; )
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{
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fTotal1 = 0.0F;
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fTotal2 = 0.0F;
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fPosition = 0.0F;
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for( xPosition = 0; xPosition < xArraySize; xPosition++ )
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{
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pfArray[ xPosition ] = fPosition * 12.123F;
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fTotal1 += fPosition * 12.123F;
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}
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#if configUSE_PREEMPTION == 0
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taskYIELD();
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#endif
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for( xPosition = 0; xPosition < xArraySize; xPosition++ )
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{
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fTotal2 += pfArray[ xPosition ];
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}
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fDifference = fTotal1 - fTotal2;
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if( fabs( fDifference ) > 0.001F )
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{
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sError = pdTRUE;
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}
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#if configUSE_PREEMPTION == 0
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taskYIELD();
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#endif
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if( sError == pdFALSE )
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{
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/* If the calculation has always been correct, increment the check
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variable so we know this task is still running okay. */
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( *pusTaskCheckVariable )++;
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}
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}
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}
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/*-----------------------------------------------------------*/
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/* This is called to check that all the created tasks are still running. */
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portBASE_TYPE xAreMathsTaskStillRunning( void )
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{
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/* Keep a history of the check variables so we know if they have been incremented
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since the last call. */
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static unsigned short usLastTaskCheck[ mathNUMBER_OF_TASKS ] = { ( unsigned short ) 0 };
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portBASE_TYPE xReturn = pdTRUE, xTask;
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/* Check the maths tasks are still running by ensuring their check variables
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are still incrementing. */
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for( xTask = 0; xTask < mathNUMBER_OF_TASKS; xTask++ )
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{
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if( usTaskCheck[ xTask ] == usLastTaskCheck[ xTask ] )
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{
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/* The check has not incremented so an error exists. */
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xReturn = pdFALSE;
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}
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usLastTaskCheck[ xTask ] = usTaskCheck[ xTask ];
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}
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return xReturn;
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}
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