| /* | |
| FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd. | |
| *************************************************************************** | |
| * * | |
| * FreeRTOS tutorial books are available in pdf and paperback. * | |
| * Complete, revised, and edited pdf reference manuals are also * | |
| * available. * | |
| * * | |
| * Purchasing FreeRTOS documentation will not only help you, by * | |
| * ensuring you get running as quickly as possible and with an * | |
| * in-depth knowledge of how to use FreeRTOS, it will also help * | |
| * the FreeRTOS project to continue with its mission of providing * | |
| * professional grade, cross platform, de facto standard solutions * | |
| * for microcontrollers - completely free of charge! * | |
| * * | |
| * >>> See http://www.FreeRTOS.org/Documentation for details. <<< * | |
| * * | |
| * Thank you for using FreeRTOS, and thank you for your support! * | |
| * * | |
| *************************************************************************** | |
| This file is part of the FreeRTOS distribution. | |
| FreeRTOS is free software; you can redistribute it and/or modify it under | |
| the terms of the GNU General Public License (version 2) as published by the | |
| Free Software Foundation AND MODIFIED BY the FreeRTOS exception. | |
| >>>NOTE<<< The modification to the GPL is included to allow you to | |
| distribute a combined work that includes FreeRTOS without being obliged to | |
| provide the source code for proprietary components outside of the FreeRTOS | |
| kernel. FreeRTOS is distributed in the hope that it will be useful, but | |
| WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
| or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| more details. You should have received a copy of the GNU General Public | |
| License and the FreeRTOS license exception along with FreeRTOS; if not it | |
| can be viewed here: http://www.freertos.org/a00114.html and also obtained | |
| by writing to Richard Barry, contact details for whom are available on the | |
| FreeRTOS WEB site. | |
| 1 tab == 4 spaces! | |
| *************************************************************************** | |
| * * | |
| * Having a problem? Start by reading the FAQ "My application does * | |
| * not run, what could be wrong? * | |
| * * | |
| * http://www.FreeRTOS.org/FAQHelp.html * | |
| * * | |
| *************************************************************************** | |
| http://www.FreeRTOS.org - Documentation, training, latest information, | |
| license and contact details. | |
| http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
| including FreeRTOS+Trace - an indispensable productivity tool. | |
| Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell | |
| the code with commercial support, indemnification, and middleware, under | |
| the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also | |
| provide a safety engineered and independently SIL3 certified version under | |
| the SafeRTOS brand: http://www.SafeRTOS.com. | |
| */ | |
| #include "FreeRTOSConfig.h" | |
| #include "portasm.h" | |
| IMPORT vTaskIncrementTick | |
| IMPORT vTaskSwitchContext | |
| IMPORT vPortSetupTimerInterrupt | |
| EXPORT vTickISR | |
| EXPORT vPortYield | |
| EXPORT xPortStartScheduler | |
| RSEG CODE | |
| /* | |
| * The RTOS tick ISR. | |
| * | |
| * If the cooperative scheduler is in use this simply increments the tick | |
| * count. | |
| * | |
| * If the preemptive scheduler is in use a context switch can also occur. | |
| */ | |
| vTickISR: | |
| portSAVE_CONTEXT | |
| call #vTaskIncrementTick | |
| #if configUSE_PREEMPTION == 1 | |
| call #vTaskSwitchContext | |
| #endif | |
| portRESTORE_CONTEXT | |
| /*-----------------------------------------------------------*/ | |
| /* | |
| * Manual context switch called by the portYIELD() macro. | |
| */ | |
| vPortYield: | |
| /* Mimic an interrupt by pushing the SR. */ | |
| push SR | |
| /* Now the SR is stacked we can disable interrupts. */ | |
| dint | |
| /* Save the context of the current task. */ | |
| portSAVE_CONTEXT | |
| /* Switch to the highest priority task that is ready to run. */ | |
| call #vTaskSwitchContext | |
| /* Restore the context of the new task. */ | |
| portRESTORE_CONTEXT | |
| /*-----------------------------------------------------------*/ | |
| /* | |
| * Start off the scheduler by initialising the RTOS tick timer, then restoring | |
| * the context of the first task. | |
| */ | |
| xPortStartScheduler: | |
| /* Setup the hardware to generate the tick. Interrupts are disabled | |
| when this function is called. */ | |
| call #vPortSetupTimerInterrupt | |
| /* Restore the context of the first task that is going to run. */ | |
| portRESTORE_CONTEXT | |
| /*-----------------------------------------------------------*/ | |
| /* Install vTickISR as the timer A0 interrupt. */ | |
| ASEG | |
| ORG 0xFFE0 + TIMERA0_VECTOR | |
| _vTickISR_: DC16 vTickISR | |
| END | |