2 FreeRTOS.org V4.0.4 - Copyright (C) 2003-2006 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 See http://www.FreeRTOS.org for documentation, latest information, license
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28 and contact details. Please ensure to read the configuration and relevant
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29 port sections of the online documentation.
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30 ***************************************************************************
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35 + ISRcode pulled inline to reduce stack-usage.
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37 + Added functionality to only call vTaskSwitchContext() once
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38 when handling multiple interruptsources in a single interruptcall.
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40 + Filename changed to a .c extension to allow stepping through code
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46 #ifndef _FREERTOS_SERIAL_ISRSERIALTX_C
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47 #define _FREERTOS_SERIAL_ISRSERIALTX_C
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49 #define serINTERRUPT_DISABLED ( 0 )
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54 * Was the interrupt the Tx register becoming empty?
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59 * Queue to interface between comms API and interrupt routine.
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61 extern xQueueHandle xCharsForTx;
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64 * Because we are not allowed to use local variables here,
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65 * PRODL and PRODH are (ab)used as temporary storage. This
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66 * is allowed because these SFR's will be restored before
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69 extern portCHAR cChar;
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70 #pragma locate cChar &PRODL
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71 extern portBASE_TYPE pxTaskWoken;
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72 #pragma locate pxTaskWoken &PRODH
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74 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &pxTaskWoken ) == pdTRUE )
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77 * Send the next character queued for Tx.
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84 * Queue empty, nothing to send.
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86 bTXIE = serINTERRUPT_DISABLED;
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90 * If we woke another task, ask for a contextswitch
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92 if( pxTaskWoken == pdTRUE )
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94 uxSwitchRequested = pdTRUE;
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99 #endif /* _FREERTOS_SERIAL_ISRSERIALTX_C */
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