;/* | |
; * FreeRTOS Kernel V10.0.0 | |
; * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved. | |
; * | |
; * Permission is hereby granted, free of charge, to any person obtaining a copy of | |
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; * the Software, and to permit persons to whom the Software is furnished to do so, | |
; * subject to the following conditions: | |
; * | |
; * The above copyright notice and this permission notice shall be included in all | |
; * copies or substantial portions of the Software. If you wish to use our Amazon | |
; * FreeRTOS name, please do so in a fair use way that does not cause confusion. | |
; * | |
; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
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; * 1 tab == 4 spaces! | |
; */ | |
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 |