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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM7_LPC2129_Keil_RVDS/] [serial/] [serialISR.s] - Rev 831
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;/* ; FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd. ; ; *************************************************************************** ; * * ; * If you are: * ; * * ; * + New to FreeRTOS, * ; * + Wanting to learn FreeRTOS or multitasking in general quickly * ; * + Looking for basic training, * ; * + Wanting to improve your FreeRTOS skills and productivity * ; * * ; * then take a look at the FreeRTOS books - available as PDF or paperback * ; * * ; * "Using the FreeRTOS Real Time Kernel - a Practical Guide" * ; * http://www.FreeRTOS.org/Documentation * ; * * ; * A pdf reference manual is also available. Both are usually delivered * ; * to your inbox within 20 minutes to two hours when purchased between 8am * ; * and 8pm GMT (although please allow up to 24 hours in case of * ; * exceptional circumstances). 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 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 ; contact details. ; ; http://www.SafeRTOS.com - A version that is certified for use in safety ; critical systems. ; ; http://www.OpenRTOS.com - Commercial support, development, porting, ; licensing and training services. ;*/ 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
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