;/* | |
; FreeRTOS.org V5.0.4 - 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 | |
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; | |
; 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 | |
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; *************************************************************************** | |
; *************************************************************************** | |
; * * | |
; * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, * | |
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; *************************************************************************** | |
; *************************************************************************** | |
; | |
; Please ensure to read the configuration and relevant port sections of the | |
; online documentation. | |
; | |
; http://www.FreeRTOS.org - Documentation, latest information, license and | |
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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 |