2 FreeRTOS V9.0.1 - Copyright (C) 2017 Real Time Engineers Ltd.
\r
5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
\r
7 This file is part of the FreeRTOS distribution.
\r
9 FreeRTOS is free software; you can redistribute it and/or modify it under
\r
10 the terms of the GNU General Public License (version 2) as published by the
\r
11 Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
\r
13 ***************************************************************************
\r
14 >>! NOTE: The modification to the GPL is included to allow you to !<<
\r
15 >>! distribute a combined work that includes FreeRTOS without being !<<
\r
16 >>! obliged to provide the source code for proprietary components !<<
\r
17 >>! outside of the FreeRTOS kernel. !<<
\r
18 ***************************************************************************
\r
20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
\r
21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
\r
22 FOR A PARTICULAR PURPOSE. Full license text is available on the following
\r
23 link: http://www.freertos.org/a00114.html
\r
25 ***************************************************************************
\r
27 * FreeRTOS provides completely free yet professionally developed, *
\r
28 * robust, strictly quality controlled, supported, and cross *
\r
29 * platform software that is more than just the market leader, it *
\r
30 * is the industry's de facto standard. *
\r
32 * Help yourself get started quickly while simultaneously helping *
\r
33 * to support the FreeRTOS project by purchasing a FreeRTOS *
\r
34 * tutorial book, reference manual, or both: *
\r
35 * http://www.FreeRTOS.org/Documentation *
\r
37 ***************************************************************************
\r
39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
\r
40 the FAQ page "My application does not run, what could be wrong?". Have you
\r
41 defined configASSERT()?
\r
43 http://www.FreeRTOS.org/support - In return for receiving this top quality
\r
44 embedded software for free we request you assist our global community by
\r
45 participating in the support forum.
\r
47 http://www.FreeRTOS.org/training - Investing in training allows your team to
\r
48 be as productive as possible as early as possible. Now you can receive
\r
49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
\r
50 Ltd, and the world's leading authority on the world's leading RTOS.
\r
52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
\r
53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
\r
54 compatible FAT file system, and our tiny thread aware UDP/IP stack.
\r
56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
\r
57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
\r
59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
\r
60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
\r
61 licenses offer ticketed support, indemnification and commercial middleware.
\r
63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
\r
64 engineered and independently SIL3 certified version for use in safety and
\r
65 mission critical applications that require provable dependability.
\r
69 #include "FreeRTOSConfig.h"
\r
70 #include "portasm.h"
\r
72 IMPORT xTaskIncrementTick
\r
73 IMPORT vTaskSwitchContext
\r
74 IMPORT vPortSetupTimerInterrupt
\r
78 EXPORT xPortStartScheduler
\r
83 * The RTOS tick ISR.
\r
85 * If the cooperative scheduler is in use this simply increments the tick
\r
88 * If the preemptive scheduler is in use a context switch can also occur.
\r
93 call #xTaskIncrementTick
\r
95 jeq SkipContextSwitch
\r
96 call #vTaskSwitchContext
\r
100 /*-----------------------------------------------------------*/
\r
104 * Manual context switch called by the portYIELD() macro.
\r
108 /* Mimic an interrupt by pushing the SR. */
\r
111 /* Now the SR is stacked we can disable interrupts. */
\r
114 /* Save the context of the current task. */
\r
117 /* Switch to the highest priority task that is ready to run. */
\r
118 call #vTaskSwitchContext
\r
120 /* Restore the context of the new task. */
\r
121 portRESTORE_CONTEXT
\r
122 /*-----------------------------------------------------------*/
\r
126 * Start off the scheduler by initialising the RTOS tick timer, then restoring
\r
127 * the context of the first task.
\r
129 xPortStartScheduler:
\r
131 /* Setup the hardware to generate the tick. Interrupts are disabled
\r
132 when this function is called. */
\r
133 call #vPortSetupTimerInterrupt
\r
135 /* Restore the context of the first task that is going to run. */
\r
136 portRESTORE_CONTEXT
\r
137 /*-----------------------------------------------------------*/
\r
140 /* Install vTickISR as the timer A0 interrupt. */
\r
142 ORG 0xFFE0 + TIMERA0_VECTOR
\r
144 _vTickISR_: DC16 vTickISR
\r