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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27 #include "FreeRTOS.h"
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30 #define isrCLEAR_EINT_1 2
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33 * Interrupt routine that simply wakes vButtonHandlerTask on each interrupt
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34 * generated by a push of the built in button. The wrapper takes care of
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35 * the ISR entry. This then calls the actual handler function to perform
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36 * the work. This work should not be done in the wrapper itself unless
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37 * you are absolutely sure that no stack space is used.
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39 void vButtonISRWrapper( void ) __attribute__ ((naked));
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40 void vButtonHandler( void ) __attribute__ ((noinline));
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42 void vButtonHandler( void )
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44 extern SemaphoreHandle_t xButtonSemaphore;
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45 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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47 xSemaphoreGiveFromISR( xButtonSemaphore, &xHigherPriorityTaskWoken );
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49 if( xHigherPriorityTaskWoken )
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51 /* We have woken a task. Calling "yield from ISR" here will ensure
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52 the interrupt returns to the woken task if it has a priority higher
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53 than the interrupted task. */
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54 portYIELD_FROM_ISR();
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57 EXTINT = isrCLEAR_EINT_1;
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60 /*-----------------------------------------------------------*/
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62 void vButtonISRWrapper( void )
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64 /* Save the context of the interrupted task. */
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67 /* Call the handler to do the work. This must be a separate function to
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68 the wrapper to ensure the correct stack frame is set up. */
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69 __asm volatile( "bl vButtonHandler" );
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71 /* Restore the context of whichever task is going to run once the interrupt
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73 portRESTORE_CONTEXT();
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