2 ; FreeRTOS.org V5.3.1 - Copyright (C) 2003-2009 Richard Barry.
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4 ; This file is part of the FreeRTOS.org distribution.
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7 ; under the terms of the GNU General Public License (version 2) as published
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8 ; by the 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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12 ; license and support terms are also available upon request. See the
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15 ; FreeRTOS.org is distributed in the hope that it will be useful, but WITHOUT
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17 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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20 ; You should have received a copy of the GNU General Public License along
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21 ; with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59
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22 ; Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 ; ***************************************************************************
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27 ; * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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29 ; * This is a concise, step by step, 'hands on' guide that describes both *
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30 ; * general multitasking concepts and FreeRTOS specifics. It presents and *
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31 ; * explains numerous examples that are written using the FreeRTOS API. *
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32 ; * Full source code for all the examples is provided in an accompanying *
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35 ; ***************************************************************************
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37 ; 1 tab == 4 spaces!
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39 ; Please ensure to read the configuration and relevant port sections of the
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40 ; online documentation.
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42 ; http://www.FreeRTOS.org - Documentation, latest information, license and
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45 ; http://www.SafeRTOS.com - A version that is certified for use in safety
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48 ; http://www.OpenRTOS.com - Commercial support, development, porting,
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49 ; licensing and training services.
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52 INCLUDE portmacro.inc
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54 ;The UART interrupt entry point is defined within an assembly wrapper
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55 ;within this file. This takes care of the task context saving before it
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56 ;calls the main handler (vUART_ISRHandler()) which is written in C within
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57 ;serial.c. The execution of the handler can unblock tasks that were blocked
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58 ;waiting for UART events. Once the handler completes the asm wrapper
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59 ;finishes off by restoring the context of whichever task is now selected to
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60 ;enter the RUNNING state (which might now be a different task to that which
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61 ;was originally interrupted.
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62 IMPORT vUART_ISRHandler
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63 EXPORT vUART_ISREntry
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65 ;/* Interrupt entry must always be in ARM mode. */
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67 AREA |.text|, CODE, READONLY
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74 ; Save the context of the interrupted task.
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77 ; Call the C handler function - defined within serial.c.
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78 LDR R0, =vUART_ISRHandler
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82 ; Finish off by restoring the context of the task that has been chosen to
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83 ; run next - which might be a different task to that which was originally
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