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183 lines
7.1 KiB
C
183 lines
7.1 KiB
C
/*
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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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* Instead of the normal single demo application, the PIC18F demo is split
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* into several smaller programs of which this is the second. This enables the
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* demo's to be executed on the RAM limited 40 pin devices. The 64 and 80 pin
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* devices require a more costly development platform and are not so readily
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* available.
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*
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* The RTOSDemo2 project is configured for a PIC18F452 device. Main2.c starts
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* 5 tasks (including the idle task).
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*
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* The first, second and third tasks do nothing but flash an LED. This gives
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* visual feedback that everything is executing as expected. One task flashes
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* an LED every 333ms (i.e. on and off every 333/2 ms), then next every 666ms
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* and the last every 999ms.
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*
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* The last task runs at the idle priority. It repeatedly performs a 32bit
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* calculation and checks it's result against the expected value. This checks
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* that the temporary storage utilised by the compiler to hold intermediate
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* results does not get corrupted when the task gets switched in and out.
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* should the calculation ever provide an incorrect result the final LED is
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* turned on.
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*
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* On entry to main() an 'X' is transmitted. Monitoring the serial port using a
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* dumb terminal allows for verification that the device is not continuously
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* being reset (no more than one 'X' should be transmitted).
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*
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* http://www.FreeRTOS.org contains important information on the use of the
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* PIC18F port.
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*/
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/*
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Changes from V2.0.0
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+ Delay periods are now specified using variables and constants of
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portTickType rather than unsigned long.
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*/
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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 app include files. */
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#include "flash.h"
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#include "partest.h"
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#include "serial.h"
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/* Priority definitions for the LED tasks. Other tasks just use the idle
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priority. */
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#define mainLED_FLASH_PRIORITY ( tskIDLE_PRIORITY + ( unsigned portBASE_TYPE ) 1 )
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/* The LED that is lit when should the calculation fail. */
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#define mainCHECK_TASK_LED ( ( unsigned portBASE_TYPE ) 3 )
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/* Constants required for the communications. Only one character is ever
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transmitted. */
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#define mainCOMMS_QUEUE_LENGTH ( ( unsigned portBASE_TYPE ) 5 )
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#define mainNO_BLOCK ( ( portTickType ) 0 )
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#define mainBAUD_RATE ( ( unsigned long ) 9600 )
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/*
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* The task that performs the 32 bit calculation at the idle priority.
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*/
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static void vCalculationTask( void *pvParameters );
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/*-----------------------------------------------------------*/
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/* Creates the tasks, then starts the scheduler. */
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void main( void )
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{
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/* Initialise the required hardware. */
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vParTestInitialise();
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vPortInitialiseBlocks();
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/* Send a character so we have some visible feedback of a reset. */
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xSerialPortInitMinimal( mainBAUD_RATE, mainCOMMS_QUEUE_LENGTH );
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xSerialPutChar( NULL, 'X', mainNO_BLOCK );
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/* Start the standard LED flash tasks as defined in demo/common/minimal. */
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vStartLEDFlashTasks( mainLED_FLASH_PRIORITY );
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/* Start the check task defined in this file. */
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xTaskCreate( vCalculationTask, ( const char * const ) "Check", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
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/* Start the scheduler. */
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vTaskStartScheduler();
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}
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/*-----------------------------------------------------------*/
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static void vCalculationTask( void *pvParameters )
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{
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volatile unsigned long ulCalculatedValue; /* Volatile to ensure optimisation is minimal. */
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/* Continuously perform a calculation. If the calculation result is ever
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incorrect turn the LED on. */
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for( ;; )
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{
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/* A good optimising compiler would just remove all this! */
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ulCalculatedValue = 1234UL;
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ulCalculatedValue *= 99UL;
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if( ulCalculatedValue != 122166UL )
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{
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vParTestSetLED( mainCHECK_TASK_LED, pdTRUE );
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}
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ulCalculatedValue *= 9876UL;
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if( ulCalculatedValue != 1206511416UL )
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{
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vParTestSetLED( mainCHECK_TASK_LED, pdTRUE );
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}
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ulCalculatedValue /= 15UL;
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if( ulCalculatedValue != 80434094UL )
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{
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vParTestSetLED( mainCHECK_TASK_LED, pdTRUE );
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}
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ulCalculatedValue += 918273UL;
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if( ulCalculatedValue != 81352367UL )
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{
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vParTestSetLED( mainCHECK_TASK_LED, pdTRUE );
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}
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}
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}
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/*-----------------------------------------------------------*/
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