;/* ; FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd. ; ; 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. ; Alternative commercial license and support terms are also available upon ; request. See the licensing section of http://www.FreeRTOS.org for full ; license details. ; ; 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 along ; with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59 ; Temple Place, Suite 330, Boston, MA 02111-1307 USA. ; ; ; *************************************************************************** ; * * ; * The FreeRTOS eBook and reference manual are available to purchase for a * ; * small fee. Help yourself get started quickly while also helping the * ; * FreeRTOS project! See http://www.FreeRTOS.org/Documentation for details * ; * * ; *************************************************************************** ; ; 1 tab == 4 spaces! ; ; Please ensure to read the configuration and relevant port sections of the ; online documentation. ; ; 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