2 ; FreeRTOS V5.4.0 - Copyright (C) 2003-2009 Richard Barry.
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4 ; This file is part of the FreeRTOS distribution.
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6 ; FreeRTOS is free software; you can redistribute it and/or modify it under
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7 ; the terms of the GNU General Public License (version 2) as published by the
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8 ; Free Software Foundation and modified by the FreeRTOS exception.
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9 ; **NOTE** The exception to the GPL is included to allow you to distribute a
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10 ; combined work that includes FreeRTOS without being obliged to provide the
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11 ; source code for proprietary components outside of the FreeRTOS kernel.
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12 ; Alternative commercial license and support terms are also available upon
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13 ; request. See the licensing section of http://www.FreeRTOS.org for full
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16 ; FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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17 ; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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21 ; You should have received a copy of the GNU General Public License along
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22 ; with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
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23 ; Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 ; ***************************************************************************
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28 ; * Looking for a quick start? Then check out the FreeRTOS eBook! *
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29 ; * See http://www.FreeRTOS.org/Documentation for details *
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31 ; ***************************************************************************
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33 ; 1 tab == 4 spaces!
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35 ; Please ensure to read the configuration and relevant port sections of the
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36 ; online documentation.
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38 ; http://www.FreeRTOS.org - Documentation, latest information, license and
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41 ; http://www.SafeRTOS.com - A version that is certified for use in safety
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44 ; http://www.OpenRTOS.com - Commercial support, development, porting,
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45 ; licensing and training services.
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48 INCLUDE portmacro.inc
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50 ;The UART interrupt entry point is defined within an assembly wrapper
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51 ;within this file. This takes care of the task context saving before it
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52 ;calls the main handler (vUART_ISRHandler()) which is written in C within
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53 ;serial.c. The execution of the handler can unblock tasks that were blocked
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54 ;waiting for UART events. Once the handler completes the asm wrapper
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55 ;finishes off by restoring the context of whichever task is now selected to
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56 ;enter the RUNNING state (which might now be a different task to that which
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57 ;was originally interrupted.
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58 IMPORT vUART_ISRHandler
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59 EXPORT vUART_ISREntry
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61 ;/* Interrupt entry must always be in ARM mode. */
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63 AREA |.text|, CODE, READONLY
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70 ; Save the context of the interrupted task.
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73 ; Call the C handler function - defined within serial.c.
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74 LDR R0, =vUART_ISRHandler
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78 ; Finish off by restoring the context of the task that has been chosen to
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79 ; run next - which might be a different task to that which was originally
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