2 FreeRTOS.org V5.2.0 - Copyright (C) 2003-2009 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 it
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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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10 FreeRTOS.org is distributed in the hope that it will be useful, but WITHOUT
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11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 You should have received a copy of the GNU General Public License along
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16 with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59
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17 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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19 A special exception to the GPL is included to allow you to distribute a
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20 combined work that includes FreeRTOS.org without being obliged to provide
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21 the source code for any proprietary components. See the licensing section
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22 of http://www.FreeRTOS.org for full details.
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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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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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54 + ISRcode pulled inline to reduce stack-usage.
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56 + Added functionality to only call vTaskSwitchContext() once
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57 when handling multiple interruptsources in a single interruptcall.
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59 + Filename changed to a .c extension to allow stepping through code
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65 #ifndef _FREERTOS_SERIAL_ISRSERIALTX_C
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66 #define _FREERTOS_SERIAL_ISRSERIALTX_C
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68 #define serINTERRUPT_DISABLED ( 0 )
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73 * Was the interrupt the Tx register becoming empty?
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78 * Queue to interface between comms API and interrupt routine.
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80 extern xQueueHandle xCharsForTx;
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83 * Because we are not allowed to use local variables here,
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84 * PRODL and PRODH are (ab)used as temporary storage. This
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85 * is allowed because these SFR's will be restored before
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88 extern portCHAR cChar;
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89 #pragma locate cChar &PRODL
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90 extern portBASE_TYPE pxTaskWoken;
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91 #pragma locate pxTaskWoken &PRODH
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93 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &pxTaskWoken ) == pdTRUE )
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96 * Send the next character queued for Tx.
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103 * Queue empty, nothing to send.
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105 bTXIE = serINTERRUPT_DISABLED;
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109 * If we woke another task, ask for a contextswitch
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111 if( pxTaskWoken == pdTRUE )
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113 uxSwitchRequested = pdTRUE;
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118 #endif /* _FREERTOS_SERIAL_ISRSERIALTX_C */
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