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_ISRSERIALTX_C
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42 #define _FREERTOS_SERIAL_ISRSERIALTX_C
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44 #define serINTERRUPT_DISABLED ( 0 )
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49 * Was the interrupt the Tx register becoming empty?
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54 * Queue to interface between comms API and interrupt routine.
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56 extern QueueHandle_t xCharsForTx;
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59 * Because we are not allowed to use local variables here,
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60 * PRODL and PRODH are (ab)used as temporary storage. This
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61 * is allowed because these SFR's will be restored before
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65 #pragma locate cChar &PRODL
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66 extern portBASE_TYPE pxTaskWoken;
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67 #pragma locate pxTaskWoken &PRODH
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69 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &pxTaskWoken ) == pdTRUE )
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72 * Send the next character queued for Tx.
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79 * Queue empty, nothing to send.
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81 bTXIE = serINTERRUPT_DISABLED;
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85 * If we woke another task, ask for a contextswitch
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87 if( pxTaskWoken == pdTRUE )
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89 uxSwitchRequested = pdTRUE;
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94 #endif /* _FREERTOS_SERIAL_ISRSERIALTX_C */
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