2 ; * FreeRTOS Kernel V10.1.0
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3 ; * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 ; * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 ; * this software and associated documentation files (the "Software"), to deal in
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7 ; * the Software without restriction, including without limitation the rights to
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8 ; * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 ; * the Software, and to permit persons to whom the Software is furnished to do so,
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10 ; * subject to the following conditions:
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12 ; * The above copyright notice and this permission notice shall be included in all
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13 ; * copies or substantial portions of the Software.
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15 ; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 ; * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 ; * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 ; * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 ; * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 ; * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 ; * http://www.FreeRTOS.org
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23 ; * http://aws.amazon.com/freertos
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25 ; * 1 tab == 4 spaces!
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28 INCLUDE portmacro.inc
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30 ;The UART interrupt entry point is defined within an assembly wrapper
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31 ;within this file. This takes care of the task context saving before it
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32 ;calls the main handler (vUART_ISRHandler()) which is written in C within
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33 ;serial.c. The execution of the handler can unblock tasks that were blocked
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34 ;waiting for UART events. Once the handler completes the asm wrapper
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35 ;finishes off by restoring the context of whichever task is now selected to
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36 ;enter the RUNNING state (which might now be a different task to that which
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37 ;was originally interrupted.
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38 IMPORT vUART_ISRHandler
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39 EXPORT vUART_ISREntry
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41 ;/* Interrupt entry must always be in ARM mode. */
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43 AREA |.text|, CODE, READONLY
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50 ; Save the context of the interrupted task.
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53 ; Call the C handler function - defined within serial.c.
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54 LDR R0, =vUART_ISRHandler
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58 ; Finish off by restoring the context of the task that has been chosen to
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59 ; run next - which might be a different task to that which was originally
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