/* | |
FreeRTOS V8.2.1 - Copyright (C) 2015 Real Time Engineers Ltd. | |
All rights reserved | |
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
This file is part of the FreeRTOS distribution. | |
FreeRTOS is free software; you can redistribute it and/or modify it under | |
the terms of the GNU General Public License (version 2) as published by the | |
Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception. | |
*************************************************************************** | |
>>! NOTE: The modification to the GPL is included to allow you to !<< | |
>>! distribute a combined work that includes FreeRTOS without being !<< | |
>>! obliged to provide the source code for proprietary components !<< | |
>>! outside of the FreeRTOS kernel. !<< | |
*************************************************************************** | |
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY | |
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
FOR A PARTICULAR PURPOSE. Full license text is available on the following | |
link: http://www.freertos.org/a00114.html | |
*************************************************************************** | |
* * | |
* FreeRTOS provides completely free yet professionally developed, * | |
* robust, strictly quality controlled, supported, and cross * | |
* platform software that is more than just the market leader, it * | |
* is the industry's de facto standard. * | |
* * | |
* Help yourself get started quickly while simultaneously helping * | |
* to support the FreeRTOS project by purchasing a FreeRTOS * | |
* tutorial book, reference manual, or both: * | |
* http://www.FreeRTOS.org/Documentation * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading | |
the FAQ page "My application does not run, what could be wrong?". Have you | |
defined configASSERT()? | |
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embedded software for free we request you assist our global community by | |
participating in the support forum. | |
http://www.FreeRTOS.org/training - Investing in training allows your team to | |
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FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers | |
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
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Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS. | |
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Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS | |
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety | |
engineered and independently SIL3 certified version for use in safety and | |
mission critical applications that require provable dependability. | |
1 tab == 4 spaces! | |
*/ | |
/* | |
Changes from V3.0.0 | |
+ ISRcode is pulled inline and portTICKisr() is therefore | |
deleted from this file. | |
+ Prescaler logic for Timer1 added to allow for a wider | |
range of TickRates. | |
Changes from V3.0.1 | |
*/ | |
#include <FreeRTOS.h> | |
#include <task.h> | |
/* IO port constants. */ | |
#define portBIT_SET (1) | |
#define portBIT_CLEAR (0) | |
/* | |
* Hardware setup for the tick. | |
* We use a compare match on timer1. Depending on MPU-frequency | |
* and requested tickrate, a prescaled value with a matching | |
* prescaler are determined. | |
*/ | |
#define portTIMER_COMPARE_BASE ((APROCFREQ/4)/configTICK_RATE_HZ) | |
#if portTIMER_COMPARE_BASE < 0x10000 | |
#define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE) | |
#define portTIMER_COMPARE_PS1 (portBIT_CLEAR) | |
#define portTIMER_COMPARE_PS0 (portBIT_CLEAR) | |
#elif portTIMER_COMPARE_BASE < 0x20000 | |
#define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 2) | |
#define portTIMER_COMPARE_PS1 (portBIT_CLEAR) | |
#define portTIMER_COMPARE_PS0 (portBIT_SET) | |
#elif portTIMER_COMPARE_BASE < 0x40000 | |
#define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 4) | |
#define portTIMER_COMPARE_PS1 (portBIT_SET) | |
#define portTIMER_COMPARE_PS0 (portBIT_CLEAR) | |
#elif portTIMER_COMPARE_BASE < 0x80000 | |
#define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 8) | |
#define portTIMER_COMPARE_PS1 (portBIT_SET) | |
#define portTIMER_COMPARE_PS0 (portBIT_SET) | |
#else | |
#error "TickRate out of range" | |
#endif | |
/*-----------------------------------------------------------*/ | |
/* | |
* Setup a timer for a regular tick. | |
*/ | |
void portSetupTick( void ) | |
{ | |
/* | |
* Interrupts are disabled when this function is called. | |
*/ | |
/* | |
* Setup CCP1 | |
* Provide the tick interrupt using a compare match on timer1. | |
*/ | |
/* | |
* Set the compare match value. | |
*/ | |
CCPR1H = ( uint8_t ) ( ( portTIMER_COMPARE_VALUE >> 8 ) & 0xff ); | |
CCPR1L = ( uint8_t ) ( portTIMER_COMPARE_VALUE & 0xff ); | |
/* | |
* Set Compare Special Event Trigger Mode | |
*/ | |
bCCP1M3 = portBIT_SET; | |
bCCP1M2 = portBIT_CLEAR; | |
bCCP1M1 = portBIT_SET; | |
bCCP1M0 = portBIT_SET; | |
/* | |
* Enable CCP1 interrupt | |
*/ | |
bCCP1IE = portBIT_SET; | |
/* | |
* We are only going to use the global interrupt bit, so disable | |
* interruptpriorities and enable peripheral interrupts. | |
*/ | |
bIPEN = portBIT_CLEAR; | |
bPEIE = portBIT_SET; | |
/* | |
* Set up timer1 | |
* It will produce the system tick. | |
*/ | |
/* | |
* Clear the time count | |
*/ | |
TMR1H = ( uint8_t ) 0x00; | |
TMR1L = ( uint8_t ) 0x00; | |
/* | |
* Setup the timer | |
*/ | |
bRD16 = portBIT_SET; // 16-bit | |
bT1CKPS1 = portTIMER_COMPARE_PS1; // prescaler | |
bT1CKPS0 = portTIMER_COMPARE_PS0; // prescaler | |
bT1OSCEN = portBIT_SET; // Oscillator enable | |
bT1SYNC = portBIT_SET; // No external clock sync | |
bTMR1CS = portBIT_CLEAR; // Internal clock | |
bTMR1ON = portBIT_SET; // Start timer1 | |
} |