blob: 6691b95d67331f81b910b8656c14c9de67380eb1 [file] [log] [blame]
;/*
; FreeRTOS V5.4.2 - 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.
;
;
; ***************************************************************************
; * *
; * Looking for a quick start? Then check out the FreeRTOS eBook! *
; * 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.
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; 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