2 ; FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
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3 ; All rights reserved
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6 ; ***************************************************************************
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8 ; * FreeRTOS tutorial books are available in pdf and paperback. *
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9 ; * Complete, revised, and edited pdf reference manuals are also *
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12 ; * Purchasing FreeRTOS documentation will not only help you, by *
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13 ; * ensuring you get running as quickly as possible and with an *
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14 ; * in-depth knowledge of how to use FreeRTOS, it will also help *
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15 ; * the FreeRTOS project to continue with its mission of providing *
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16 ; * professional grade, cross platform, de facto standard solutions *
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17 ; * for microcontrollers - completely free of charge! *
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19 ; * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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21 ; * Thank you for using FreeRTOS, and thank you for your support! *
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23 ; ***************************************************************************
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26 ; This file is part of the FreeRTOS distribution.
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28 ; FreeRTOS is free software; you can redistribute it and/or modify it under
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29 ; the terms of the GNU General Public License (version 2) as published by the
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30 ; Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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31 ; >>>NOTE<<< The modification to the GPL is included to allow you to
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32 ; distribute a combined work that includes FreeRTOS without being obliged to
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33 ; provide the source code for proprietary components outside of the FreeRTOS
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34 ; kernel. FreeRTOS is distributed in the hope that it will be useful, but
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35 ; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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36 ; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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37 ; more details. You should have received a copy of the GNU General Public
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38 ; License and the FreeRTOS license exception along with FreeRTOS; if not it
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39 ; can be viewed here: http://www.freertos.org/a00114.html and also obtained
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40 ; by writing to Richard Barry, contact details for whom are available on the
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41 ; FreeRTOS WEB site.
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43 ; 1 tab == 4 spaces!
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45 ; http://www.FreeRTOS.org - Documentation, latest information, license and
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48 ; http://www.SafeRTOS.com - A version that is certified for use in safety
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51 ; http://www.OpenRTOS.com - Commercial support, development, porting,
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52 ; licensing and training services.
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55 #include "ISR_Support.h"
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61 PUBLIC vPortStartFirstTask
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64 EXTERN vTaskSwitchContext
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65 EXTERN xTaskIncrementTick
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67 ; FreeRTOS yield handler. This is installed as the BRK software interrupt
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71 portSAVE_CONTEXT ; Save the context of the current task.
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72 call vTaskSwitchContext ; Call the scheduler to select the next task.
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73 portRESTORE_CONTEXT ; Restore the context of the next task to run.
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77 ; Starts the scheduler by restoring the context of the task that will execute
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80 vPortStartFirstTask:
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81 portRESTORE_CONTEXT ; Restore the context of whichever task the ...
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82 reti ; An interrupt stack frame is used so the task
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83 ; is started using a RETI instruction.
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85 ; FreeRTOS tick handler. This is installed as the interval timer interrupt
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90 portSAVE_CONTEXT ; Save the context of the current task.
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91 call xTaskIncrementTick ; Call the timer tick function.
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94 call vTaskSwitchContext ; Call the scheduler to select the next task.
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95 portRESTORE_CONTEXT ; Restore the context of the next task to run.
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99 ; Install the interrupt handlers
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101 COMMON INTVEC:CODE:ROOT(1)
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102 ORG configTICK_VECTOR
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105 COMMON INTVEC:CODE:ROOT(1)
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