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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52 /*-----------------------------------------------------------
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53 * Components that can be compiled to either ARM or THUMB mode are
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54 * contained in serial.c The ISR routines, which can only be compiled
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55 * to ARM mode, are contained in this file.
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56 *----------------------------------------------------------*/
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60 /* Library includes. */
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61 #include "75x_uart.h"
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63 /* Scheduler includes. */
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64 #include "FreeRTOS.h"
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67 static xQueueHandle xRxedChars;
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68 static xQueueHandle xCharsForTx;
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69 static portBASE_TYPE volatile *pxQueueEmpty;
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71 void vConfigureQueues( xQueueHandle xQForRx, xQueueHandle xQForTx, portBASE_TYPE volatile *pxEmptyFlag )
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73 xRxedChars = xQForRx;
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74 xCharsForTx = xQForTx;
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75 pxQueueEmpty = pxEmptyFlag;
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77 /*-----------------------------------------------------------*/
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79 void vSerialISR( void )
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81 signed portCHAR cChar;
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82 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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86 if( UART0->MIS & UART_IT_Transmit )
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88 /* The interrupt was caused by the THR becoming empty. Are there any
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89 more characters to transmit? */
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90 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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92 /* A character was retrieved from the queue so can be sent to the
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98 *pxQueueEmpty = pdTRUE;
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101 UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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104 if( UART0->MIS & UART_IT_Receive )
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106 /* The interrupt was caused by a character being received. Grab the
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107 character from the RHR and place it in the queue of received
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110 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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111 UART_ClearITPendingBit( UART0, UART_IT_Receive );
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113 } while( UART0->MIS );
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115 /* If a task was woken by either a character being received or a character
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116 being transmitted then we may need to switch to another task. */
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117 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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