| ;/* | |
| ; FreeRTOS V6.0.1 - Copyright (C) 2009 Real Time Engineers Ltd. | |
| ; | |
| ; *************************************************************************** | |
| ; * * | |
| ; * If you are: * | |
| ; * * | |
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| ; * then take a look at the FreeRTOS eBook * | |
| ; * * | |
| ; * "Using the FreeRTOS Real Time Kernel - a Practical Guide" * | |
| ; * http://www.FreeRTOS.org/Documentation * | |
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| ; *************************************************************************** | |
| ; | |
| ; 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 exception 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! | |
| ; | |
| ; http://www.FreeRTOS.org - Documentation, latest information, license and | |
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| ; | |
| ; http://www.SafeRTOS.com - A version that is certified for use in safety | |
| ; critical systems. | |
| ; | |
| ; http://www.OpenRTOS.com - Commercial support, development, porting, | |
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| ;*/ | |
| INCLUDE portmacro.inc | |
| ;The UART interrupt entry point is defined within an assembly wrapper | |
| ;within this file. This takes care of the task context saving before it | |
| ;calls the main handler (vUART_ISRHandler()) which is written in C within | |
| ;serial.c. The execution of the handler can unblock tasks that were blocked | |
| ;waiting for UART events. Once the handler completes the asm wrapper | |
| ;finishes off by restoring the context of whichever task is now selected to | |
| ;enter the RUNNING state (which might now be a different task to that which | |
| ;was originally interrupted. | |
| IMPORT vUART_ISRHandler | |
| EXPORT vUART_ISREntry | |
| ;/* Interrupt entry must always be in ARM mode. */ | |
| ARM | |
| AREA |.text|, CODE, READONLY | |
| vUART_ISREntry | |
| PRESERVE8 | |
| ; Save the context of the interrupted task. | |
| portSAVE_CONTEXT | |
| ; Call the C handler function - defined within serial.c. | |
| LDR R0, =vUART_ISRHandler | |
| MOV LR, PC | |
| BX R0 | |
| ; Finish off by restoring the context of the task that has been chosen to | |
| ; run next - which might be a different task to that which was originally | |
| ; interrupted. | |
| portRESTORE_CONTEXT | |
| END |