2 FreeRTOS V8.1.1 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to !<<
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28 >>! distribute a combined work that includes FreeRTOS without being !<<
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29 >>! obliged to provide the source code for proprietary components !<<
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30 >>! outside of the FreeRTOS kernel. !<<
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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66 /*-----------------------------------------------------------
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67 * Components that can be compiled to either ARM or THUMB mode are
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68 * contained in serial.c The ISR routines, which can only be compiled
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69 * to ARM mode, are contained in this file.
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70 *----------------------------------------------------------*/
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74 /* Library includes. */
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75 #include "75x_uart.h"
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77 /* Scheduler includes. */
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78 #include "FreeRTOS.h"
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81 static QueueHandle_t xRxedChars;
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82 static QueueHandle_t xCharsForTx;
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83 static portBASE_TYPE volatile *pxQueueEmpty;
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85 void vConfigureQueues( QueueHandle_t xQForRx, QueueHandle_t xQForTx, portBASE_TYPE volatile *pxEmptyFlag )
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87 xRxedChars = xQForRx;
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88 xCharsForTx = xQForTx;
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89 pxQueueEmpty = pxEmptyFlag;
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91 /*-----------------------------------------------------------*/
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93 void vSerialISR( void )
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96 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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100 if( UART0->MIS & UART_IT_Transmit )
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102 /* The interrupt was caused by the THR becoming empty. Are there any
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103 more characters to transmit? */
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104 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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106 /* A character was retrieved from the queue so can be sent to the
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112 *pxQueueEmpty = pdTRUE;
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115 UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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118 if( UART0->MIS & UART_IT_Receive )
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120 /* The interrupt was caused by a character being received. Grab the
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121 character from the RHR and place it in the queue of received
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124 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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125 UART_ClearITPendingBit( UART0, UART_IT_Receive );
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127 } while( UART0->MIS );
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129 /* If a task was woken by either a character being received or a character
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130 being transmitted then we may need to switch to another task. */
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131 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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