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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68 + pxPortInitialiseStack() now initialises the stack of new tasks to the
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69 same format used by the compiler. This allows the compiler generated
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70 interrupt mechanism to be used for context switches.
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74 + Move usPortCheckFreeStackSpace() to tasks.c.
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80 #include "FreeRTOS.h"
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82 /*-----------------------------------------------------------*/
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84 /* See header file for description. */
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85 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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87 portSTACK_TYPE DS_Reg = 0;
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89 /* Place a few bytes of known values on the bottom of the stack.
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90 This is just useful for debugging. */
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92 *pxTopOfStack = 0x1111;
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94 *pxTopOfStack = 0x2222;
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96 *pxTopOfStack = 0x3333;
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98 *pxTopOfStack = 0x4444;
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100 *pxTopOfStack = 0x5555;
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104 /*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */
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106 /* We are going to start the scheduler using a return from interrupt
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107 instruction to load the program counter, so first there would be the
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108 function call with parameters preamble. */
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110 *pxTopOfStack = FP_SEG( pvParameters );
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112 *pxTopOfStack = FP_OFF( pvParameters );
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114 *pxTopOfStack = FP_SEG( pxCode );
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116 *pxTopOfStack = FP_OFF( pxCode );
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119 /* Next the status register and interrupt return address. */
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120 *pxTopOfStack = portINITIAL_SW;
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122 *pxTopOfStack = FP_SEG( pxCode );
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124 *pxTopOfStack = FP_OFF( pxCode );
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127 /* The remaining registers would be pushed on the stack by our context
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128 switch function. These are loaded with values simply to make debugging
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130 *pxTopOfStack = ( portSTACK_TYPE ) 0xAAAA; /* AX */
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132 *pxTopOfStack = ( portSTACK_TYPE ) 0xBBBB; /* BX */
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134 *pxTopOfStack = ( portSTACK_TYPE ) 0xCCCC; /* CX */
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136 *pxTopOfStack = ( portSTACK_TYPE ) 0xDDDD; /* DX */
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138 *pxTopOfStack = ( portSTACK_TYPE ) 0xEEEE; /* ES */
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141 /* We need the true data segment. */
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142 __asm{ MOV DS_Reg, DS };
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144 *pxTopOfStack = DS_Reg; /* DS */
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146 *pxTopOfStack = ( portSTACK_TYPE ) 0x0123; /* SI */
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148 *pxTopOfStack = ( portSTACK_TYPE ) 0xDDDD; /* DI */
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150 *pxTopOfStack = ( portSTACK_TYPE ) 0xBBBB; /* BP */
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152 /*lint +e950 +e611 +e923 */
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154 return pxTopOfStack;
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156 /*-----------------------------------------------------------*/
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