;/* | |
; FreeRTOS.org V5.3.0 - Copyright (C) 2003-2009 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 (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.org without being obliged to provide | |
; the source code for any proprietary components. Alternative commercial | |
; license and support terms are also available upon request. See the | |
; licensing section of http://www.FreeRTOS.org for full details. | |
; | |
; 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. | |
; | |
; | |
; *************************************************************************** | |
; * * | |
; * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation * | |
; * * | |
; * This is a concise, step by step, 'hands on' guide that describes both * | |
; * general multitasking concepts and FreeRTOS specifics. It presents and * | |
; * explains numerous examples that are written using the FreeRTOS API. * | |
; * Full source code for all the examples is provided in an accompanying * | |
; * .zip file. * | |
; * * | |
; *************************************************************************** | |
; | |
; 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 |