2 FreeRTOS V7.4.0 - Copyright (C) 2013 Real Time Engineers Ltd.
\r
4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
\r
5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
\r
7 ***************************************************************************
\r
9 * FreeRTOS tutorial books are available in pdf and paperback. *
\r
10 * Complete, revised, and edited pdf reference manuals are also *
\r
13 * Purchasing FreeRTOS documentation will not only help you, by *
\r
14 * ensuring you get running as quickly as possible and with an *
\r
15 * in-depth knowledge of how to use FreeRTOS, it will also help *
\r
16 * the FreeRTOS project to continue with its mission of providing *
\r
17 * professional grade, cross platform, de facto standard solutions *
\r
18 * for microcontrollers - completely free of charge! *
\r
20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
\r
22 * Thank you for using FreeRTOS, and thank you for your support! *
\r
24 ***************************************************************************
\r
27 This file is part of the FreeRTOS distribution.
\r
29 FreeRTOS is free software; you can redistribute it and/or modify it under
\r
30 the terms of the GNU General Public License (version 2) as published by the
\r
31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
\r
33 >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
\r
34 distribute a combined work that includes FreeRTOS without being obliged to
\r
35 provide the source code for proprietary components outside of the FreeRTOS
\r
38 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
\r
39 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
\r
40 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
\r
41 details. You should have received a copy of the GNU General Public License
\r
42 and the FreeRTOS license exception along with FreeRTOS; if not itcan be
\r
43 viewed here: http://www.freertos.org/a00114.html and also obtained by
\r
44 writing to Real Time Engineers Ltd., contact details for whom are available
\r
45 on the FreeRTOS WEB site.
\r
49 ***************************************************************************
\r
51 * Having a problem? Start by reading the FAQ "My application does *
\r
52 * not run, what could be wrong?" *
\r
54 * http://www.FreeRTOS.org/FAQHelp.html *
\r
56 ***************************************************************************
\r
59 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
\r
60 license and Real Time Engineers Ltd. contact details.
\r
62 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
\r
63 including FreeRTOS+Trace - an indispensable productivity tool, and our new
\r
64 fully thread aware and reentrant UDP/IP stack.
\r
66 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
\r
67 Integrity Systems, who sell the code with commercial support,
\r
68 indemnification and middleware, under the OpenRTOS brand.
\r
70 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
\r
71 engineered and independently SIL3 certified version for use in safety and
\r
72 mission critical applications that require provable dependability.
\r
74 #include "FreeRTOSConfig.h"
\r
75 #include "portasm.h"
\r
77 IMPORT vTaskIncrementTick
\r
78 IMPORT vTaskSwitchContext
\r
79 IMPORT vPortSetupTimerInterrupt
\r
83 EXPORT xPortStartScheduler
\r
88 * The RTOS tick ISR.
\r
90 * If the cooperative scheduler is in use this simply increments the tick
\r
93 * If the preemptive scheduler is in use a context switch can also occur.
\r
98 call #vTaskIncrementTick
\r
100 #if configUSE_PREEMPTION == 1
\r
101 call #vTaskSwitchContext
\r
104 portRESTORE_CONTEXT
\r
105 /*-----------------------------------------------------------*/
\r
109 * Manual context switch called by the portYIELD() macro.
\r
113 /* Mimic an interrupt by pushing the SR. */
\r
116 /* Now the SR is stacked we can disable interrupts. */
\r
119 /* Save the context of the current task. */
\r
122 /* Switch to the highest priority task that is ready to run. */
\r
123 call #vTaskSwitchContext
\r
125 /* Restore the context of the new task. */
\r
126 portRESTORE_CONTEXT
\r
127 /*-----------------------------------------------------------*/
\r
131 * Start off the scheduler by initialising the RTOS tick timer, then restoring
\r
132 * the context of the first task.
\r
134 xPortStartScheduler:
\r
136 /* Setup the hardware to generate the tick. Interrupts are disabled
\r
137 when this function is called. */
\r
138 call #vPortSetupTimerInterrupt
\r
140 /* Restore the context of the first task that is going to run. */
\r
141 portRESTORE_CONTEXT
\r
142 /*-----------------------------------------------------------*/
\r
145 /* Install vTickISR as the timer A0 interrupt. */
\r
147 ORG 0xFFE0 + TIMERA0_VECTOR
\r
149 _vTickISR_: DC16 vTickISR
\r