2 FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
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13 ***************************************************************************
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14 >>! NOTE: The modification to the GPL is included to allow you to !<<
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15 >>! distribute a combined work that includes FreeRTOS without being !<<
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16 >>! obliged to provide the source code for proprietary components !<<
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17 >>! outside of the FreeRTOS kernel. !<<
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18 ***************************************************************************
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20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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22 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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23 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * FreeRTOS provides completely free yet professionally developed, *
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28 * robust, strictly quality controlled, supported, and cross *
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29 * platform software that is more than just the market leader, it *
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30 * is the industry's de facto standard. *
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32 * Help yourself get started quickly while simultaneously helping *
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33 * to support the FreeRTOS project by purchasing a FreeRTOS *
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34 * tutorial book, reference manual, or both: *
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35 * http://www.FreeRTOS.org/Documentation *
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37 ***************************************************************************
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39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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40 the FAQ page "My application does not run, what could be wrong?". Have you
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41 defined configASSERT()?
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43 http://www.FreeRTOS.org/support - In return for receiving this top quality
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44 embedded software for free we request you assist our global community by
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45 participating in the support forum.
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47 http://www.FreeRTOS.org/training - Investing in training allows your team to
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48 be as productive as possible as early as possible. Now you can receive
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49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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50 Ltd, and the world's leading authority on the world's leading RTOS.
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52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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54 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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61 licenses offer ticketed support, indemnification and commercial middleware.
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63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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64 engineered and independently SIL3 certified version for use in safety and
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65 mission critical applications that require provable dependability.
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72 + ISRcode is pulled inline and portTICKisr() is therefore
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73 deleted from this file.
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75 + Prescaler logic for Timer1 added to allow for a wider
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81 #include <FreeRTOS.h>
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84 /* IO port constants. */
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85 #define portBIT_SET (1)
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86 #define portBIT_CLEAR (0)
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89 * Hardware setup for the tick.
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90 * We use a compare match on timer1. Depending on MPU-frequency
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91 * and requested tickrate, a prescaled value with a matching
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92 * prescaler are determined.
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94 #define portTIMER_COMPARE_BASE ((APROCFREQ/4)/configTICK_RATE_HZ)
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96 #if portTIMER_COMPARE_BASE < 0x10000
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97 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE)
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98 #define portTIMER_COMPARE_PS1 (portBIT_CLEAR)
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99 #define portTIMER_COMPARE_PS0 (portBIT_CLEAR)
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100 #elif portTIMER_COMPARE_BASE < 0x20000
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101 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 2)
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102 #define portTIMER_COMPARE_PS1 (portBIT_CLEAR)
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103 #define portTIMER_COMPARE_PS0 (portBIT_SET)
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104 #elif portTIMER_COMPARE_BASE < 0x40000
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105 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 4)
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106 #define portTIMER_COMPARE_PS1 (portBIT_SET)
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107 #define portTIMER_COMPARE_PS0 (portBIT_CLEAR)
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108 #elif portTIMER_COMPARE_BASE < 0x80000
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109 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 8)
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110 #define portTIMER_COMPARE_PS1 (portBIT_SET)
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111 #define portTIMER_COMPARE_PS0 (portBIT_SET)
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113 #error "TickRate out of range"
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116 /*-----------------------------------------------------------*/
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119 * Setup a timer for a regular tick.
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121 void portSetupTick( void )
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124 * Interrupts are disabled when this function is called.
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129 * Provide the tick interrupt using a compare match on timer1.
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133 * Set the compare match value.
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135 CCPR1H = ( uint8_t ) ( ( portTIMER_COMPARE_VALUE >> 8 ) & 0xff );
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136 CCPR1L = ( uint8_t ) ( portTIMER_COMPARE_VALUE & 0xff );
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139 * Set Compare Special Event Trigger Mode
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141 bCCP1M3 = portBIT_SET;
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142 bCCP1M2 = portBIT_CLEAR;
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143 bCCP1M1 = portBIT_SET;
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144 bCCP1M0 = portBIT_SET;
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147 * Enable CCP1 interrupt
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149 bCCP1IE = portBIT_SET;
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152 * We are only going to use the global interrupt bit, so disable
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153 * interruptpriorities and enable peripheral interrupts.
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155 bIPEN = portBIT_CLEAR;
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156 bPEIE = portBIT_SET;
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160 * It will produce the system tick.
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164 * Clear the time count
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166 TMR1H = ( uint8_t ) 0x00;
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167 TMR1L = ( uint8_t ) 0x00;
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172 bRD16 = portBIT_SET; // 16-bit
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173 bT1CKPS1 = portTIMER_COMPARE_PS1; // prescaler
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174 bT1CKPS0 = portTIMER_COMPARE_PS0; // prescaler
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175 bT1OSCEN = portBIT_SET; // Oscillator enable
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176 bT1SYNC = portBIT_SET; // No external clock sync
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177 bTMR1CS = portBIT_CLEAR; // Internal clock
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179 bTMR1ON = portBIT_SET; // Start timer1
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