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;/*
; FreeRTOS.org V5.1.1 - Copyright (C) 2003-2008 Richard Barry.
;
; This file is part of the FreeRTOS.org distribution.
;
; FreeRTOS.org is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; FreeRTOS.org 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.org; if not, write to the Free Software
; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
;
; A special exception to the GPL can be applied should you wish to distribute
; a combined work that includes FreeRTOS.org, without being obliged to provide
; the source code for any proprietary components. See the licensing section
; of http://www.FreeRTOS.org for full details of how and when the exception
; can be applied.
;
; ***************************************************************************
; ***************************************************************************
; * *
; * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
; * and even write all or part of your application on your behalf. *
; * See http://www.OpenRTOS.com for details of the services we provide to *
; * expedite your project. *
; * *
; ***************************************************************************
; ***************************************************************************
;
; 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
|
