2 FreeRTOS V7.5.0 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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6 ***************************************************************************
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8 * FreeRTOS provides completely free yet professionally developed, *
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9 * robust, strictly quality controlled, supported, and cross *
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10 * platform software that has become a de facto standard. *
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12 * Help yourself get started quickly and support the FreeRTOS *
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13 * project by purchasing a FreeRTOS tutorial book, reference *
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14 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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18 ***************************************************************************
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20 This file is part of the FreeRTOS distribution.
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22 FreeRTOS is free software; you can redistribute it and/or modify it under
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23 the terms of the GNU General Public License (version 2) as published by the
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24 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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26 >>! NOTE: The modification to the GPL is included to allow you to distribute
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27 >>! a combined work that includes FreeRTOS without being obliged to provide
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28 >>! the source code for proprietary components outside of the FreeRTOS
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31 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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32 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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33 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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34 link: http://www.freertos.org/a00114.html
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38 ***************************************************************************
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40 * Having a problem? Start by reading the FAQ "My application does *
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41 * not run, what could be wrong?" *
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43 * http://www.FreeRTOS.org/FAQHelp.html *
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45 ***************************************************************************
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47 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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48 license and Real Time Engineers Ltd. contact details.
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50 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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51 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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52 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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54 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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55 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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56 licenses offer ticketed support, indemnification and middleware.
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58 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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59 engineered and independently SIL3 certified version for use in safety and
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60 mission critical applications that require provable dependability.
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67 + ISRcode is pulled inline and portTICKisr() is therefore
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68 deleted from this file.
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70 + Prescaler logic for Timer1 added to allow for a wider
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76 #include <FreeRTOS.h>
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79 /* IO port constants. */
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80 #define portBIT_SET (1)
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81 #define portBIT_CLEAR (0)
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84 * Hardware setup for the tick.
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85 * We use a compare match on timer1. Depending on MPU-frequency
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86 * and requested tickrate, a prescaled value with a matching
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87 * prescaler are determined.
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89 #define portTIMER_COMPARE_BASE ((APROCFREQ/4)/configTICK_RATE_HZ)
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91 #if portTIMER_COMPARE_BASE < 0x10000
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92 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE)
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93 #define portTIMER_COMPARE_PS1 (portBIT_CLEAR)
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94 #define portTIMER_COMPARE_PS0 (portBIT_CLEAR)
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95 #elif portTIMER_COMPARE_BASE < 0x20000
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96 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 2)
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97 #define portTIMER_COMPARE_PS1 (portBIT_CLEAR)
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98 #define portTIMER_COMPARE_PS0 (portBIT_SET)
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99 #elif portTIMER_COMPARE_BASE < 0x40000
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100 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 4)
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101 #define portTIMER_COMPARE_PS1 (portBIT_SET)
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102 #define portTIMER_COMPARE_PS0 (portBIT_CLEAR)
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103 #elif portTIMER_COMPARE_BASE < 0x80000
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104 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 8)
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105 #define portTIMER_COMPARE_PS1 (portBIT_SET)
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106 #define portTIMER_COMPARE_PS0 (portBIT_SET)
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108 #error "TickRate out of range"
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111 /*-----------------------------------------------------------*/
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114 * Setup a timer for a regular tick.
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116 void portSetupTick( void )
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119 * Interrupts are disabled when this function is called.
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124 * Provide the tick interrupt using a compare match on timer1.
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128 * Set the compare match value.
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130 CCPR1H = ( unsigned char ) ( ( portTIMER_COMPARE_VALUE >> 8 ) & 0xff );
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131 CCPR1L = ( unsigned char ) ( portTIMER_COMPARE_VALUE & 0xff );
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134 * Set Compare Special Event Trigger Mode
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136 bCCP1M3 = portBIT_SET;
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137 bCCP1M2 = portBIT_CLEAR;
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138 bCCP1M1 = portBIT_SET;
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139 bCCP1M0 = portBIT_SET;
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142 * Enable CCP1 interrupt
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144 bCCP1IE = portBIT_SET;
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147 * We are only going to use the global interrupt bit, so disable
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148 * interruptpriorities and enable peripheral interrupts.
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150 bIPEN = portBIT_CLEAR;
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151 bPEIE = portBIT_SET;
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155 * It will produce the system tick.
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159 * Clear the time count
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161 TMR1H = ( unsigned char ) 0x00;
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162 TMR1L = ( unsigned char ) 0x00;
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167 bRD16 = portBIT_SET; // 16-bit
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168 bT1CKPS1 = portTIMER_COMPARE_PS1; // prescaler
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169 bT1CKPS0 = portTIMER_COMPARE_PS0; // prescaler
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170 bT1OSCEN = portBIT_SET; // Oscillator enable
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171 bT1SYNC = portBIT_SET; // No external clock sync
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172 bTMR1CS = portBIT_CLEAR; // Internal clock
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174 bTMR1ON = portBIT_SET; // Start timer1
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