2 * FreeRTOS Kernel V10.0.0
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3 * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software. If you wish to use our Amazon
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14 * FreeRTOS name, please do so in a fair use way that does not cause confusion.
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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18 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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19 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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20 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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23 * http://www.FreeRTOS.org
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24 * http://aws.amazon.com/freertos
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26 * 1 tab == 4 spaces!
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29 /*-----------------------------------------------------------
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30 * Components that can be compiled to either ARM or THUMB mode are
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31 * contained in serial.c The ISR routines, which can only be compiled
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32 * to ARM mode, are contained in this file.
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33 *----------------------------------------------------------*/
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37 /* Library includes. */
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38 #include "75x_uart.h"
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40 /* Scheduler includes. */
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41 #include "FreeRTOS.h"
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44 static QueueHandle_t xRxedChars;
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45 static QueueHandle_t xCharsForTx;
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46 static portBASE_TYPE volatile *pxQueueEmpty;
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48 void vConfigureQueues( QueueHandle_t xQForRx, QueueHandle_t xQForTx, portBASE_TYPE volatile *pxEmptyFlag )
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50 xRxedChars = xQForRx;
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51 xCharsForTx = xQForTx;
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52 pxQueueEmpty = pxEmptyFlag;
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54 /*-----------------------------------------------------------*/
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56 void vSerialISR( void )
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59 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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63 if( UART0->MIS & UART_IT_Transmit )
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65 /* The interrupt was caused by the THR becoming empty. Are there any
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66 more characters to transmit? */
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67 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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69 /* A character was retrieved from the queue so can be sent to the
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75 *pxQueueEmpty = pdTRUE;
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78 UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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81 if( UART0->MIS & UART_IT_Receive )
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83 /* The interrupt was caused by a character being received. Grab the
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84 character from the RHR and place it in the queue of received
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87 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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88 UART_ClearITPendingBit( UART0, UART_IT_Receive );
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90 } while( UART0->MIS );
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92 /* If a task was woken by either a character being received or a character
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93 being transmitted then we may need to switch to another task. */
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94 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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