2 * FreeRTOS Kernel V10.3.0
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3 * Copyright (C) 2020 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.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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30 + ISRcode pulled inline to reduce stack-usage.
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32 + Added functionality to only call vTaskSwitchContext() once
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33 when handling multiple interruptsources in a single interruptcall.
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35 + Filename changed to a .c extension to allow stepping through code
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41 #ifndef _FREERTOS_SERIAL_ISRSERIALRX_C
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42 #define _FREERTOS_SERIAL_ISRSERIALRX_C
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44 #define serCONTINUOUS_RX ( 1 )
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45 #define serCLEAR_OVERRUN ( 0 )
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49 * Was the interrupt a byte being received?
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54 * Queue to interface between comms API and interrupt routine.
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56 extern QueueHandle_t xRxedChars;
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59 * Because we are not allowed to use local variables here,
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60 * PRODL is (ab)used as temporary storage. This is allowed
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61 * because this SFR will be restored before exiting the ISR.
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64 extern portBASE_TYPE xHigherPriorityTaskWoken;
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65 #pragma locate cChar &PRODL
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68 * If there was a framing error, just get and ignore
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78 * Get the character and post it on the queue of Rxed
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79 * characters. If the post causes a task to wake ask
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80 * for a context switch as the woken task may have a
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81 * higher priority than the task we have interrupted.
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86 * Clear any overrun errors.
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90 bCREN = serCLEAR_OVERRUN;
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91 bCREN = serCONTINUOUS_RX;
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94 xHigherPriorityTaskWoken = pdFALSE;
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95 xQueueSendFromISR( xRxedChars, ( const void * ) &cChar, &xHigherPriorityTaskWoken );
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97 if( xHigherPriorityTaskWoken )
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99 uxSwitchRequested = pdTRUE;
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105 #endif /* _FREERTOS_SERIAL_ISRSERIALRX_C */
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