mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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181 lines
6.7 KiB
C
181 lines
6.7 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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Changes from V3.0.0
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+ ISRcode is pulled inline and portTICKisr() is therefore
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deleted from this file.
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+ Prescaler logic for Timer1 added to allow for a wider
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range of TickRates.
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Changes from V3.0.1
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*/
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#include <FreeRTOS.h>
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#include <task.h>
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/* IO port constants. */
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#define portBIT_SET (1)
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#define portBIT_CLEAR (0)
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/*
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* Hardware setup for the tick.
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* We use a compare match on timer1. Depending on MPU-frequency
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* and requested tickrate, a prescaled value with a matching
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* prescaler are determined.
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*/
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#define portTIMER_COMPARE_BASE ((APROCFREQ/4)/configTICK_RATE_HZ)
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#if portTIMER_COMPARE_BASE < 0x10000
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#define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE)
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#define portTIMER_COMPARE_PS1 (portBIT_CLEAR)
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#define portTIMER_COMPARE_PS0 (portBIT_CLEAR)
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#elif portTIMER_COMPARE_BASE < 0x20000
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#define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 2)
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#define portTIMER_COMPARE_PS1 (portBIT_CLEAR)
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#define portTIMER_COMPARE_PS0 (portBIT_SET)
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#elif portTIMER_COMPARE_BASE < 0x40000
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#define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 4)
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#define portTIMER_COMPARE_PS1 (portBIT_SET)
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#define portTIMER_COMPARE_PS0 (portBIT_CLEAR)
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#elif portTIMER_COMPARE_BASE < 0x80000
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#define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 8)
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#define portTIMER_COMPARE_PS1 (portBIT_SET)
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#define portTIMER_COMPARE_PS0 (portBIT_SET)
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#else
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#error "TickRate out of range"
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#endif
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/*-----------------------------------------------------------*/
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/*
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* Setup a timer for a regular tick.
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*/
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void portSetupTick( void )
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{
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/*
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* Interrupts are disabled when this function is called.
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*/
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/*
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* Setup CCP1
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* Provide the tick interrupt using a compare match on timer1.
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*/
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/*
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* Set the compare match value.
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*/
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CCPR1H = ( uint8_t ) ( ( portTIMER_COMPARE_VALUE >> 8 ) & 0xff );
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CCPR1L = ( uint8_t ) ( portTIMER_COMPARE_VALUE & 0xff );
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/*
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* Set Compare Special Event Trigger Mode
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*/
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bCCP1M3 = portBIT_SET;
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bCCP1M2 = portBIT_CLEAR;
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bCCP1M1 = portBIT_SET;
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bCCP1M0 = portBIT_SET;
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/*
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* Enable CCP1 interrupt
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*/
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bCCP1IE = portBIT_SET;
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/*
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* We are only going to use the global interrupt bit, so disable
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* interruptpriorities and enable peripheral interrupts.
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*/
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bIPEN = portBIT_CLEAR;
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bPEIE = portBIT_SET;
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/*
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* Set up timer1
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* It will produce the system tick.
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*/
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/*
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* Clear the time count
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*/
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TMR1H = ( uint8_t ) 0x00;
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TMR1L = ( uint8_t ) 0x00;
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/*
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* Setup the timer
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*/
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bRD16 = portBIT_SET; // 16-bit
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bT1CKPS1 = portTIMER_COMPARE_PS1; // prescaler
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bT1CKPS0 = portTIMER_COMPARE_PS0; // prescaler
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bT1OSCEN = portBIT_SET; // Oscillator enable
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bT1SYNC = portBIT_SET; // No external clock sync
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bTMR1CS = portBIT_CLEAR; // Internal clock
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bTMR1ON = portBIT_SET; // Start timer1
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}
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