2 * FreeRTOS Kernel V10.1.0
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3 * Copyright (C) 2018 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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28 /******************************************************************************
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29 * This project provides two demo applications. A simple blinky style project,
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30 * and a more comprehensive test and demo application. The
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31 * mainCREATE_SIMPLE_BLINKY_DEMO_ONLY setting (defined in this file) is used to
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32 * select between the two. The simply blinky demo is implemented and described
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33 * in main_blinky.c. The more comprehensive test and demo application is
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34 * implemented and described in main_full.c.
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36 * This file implements the code that is not demo specific, including the
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37 * hardware setup and FreeRTOS hook functions.
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39 * This project does not provide an example of how to write an RTOS compatible
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40 * interrupt service routine (other than the tick interrupt itself), so this
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41 * file contains the function vAnExampleISR_C_Handler() as a dummy example (that
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42 * is not actually installed) that can be used as a reference. Also see the
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43 * file ExampleISR.S, and the documentation page for this demo on the
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44 * FreeRTOS.org website for full instructions.
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46 * ENSURE TO READ THE DOCUMENTATION PAGE FOR THIS PORT AND DEMO APPLICATION ON
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47 * THE http://www.FreeRTOS.org WEB SITE FOR FULL INFORMATION ON USING THIS DEMO
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48 * APPLICATION, AND ITS ASSOCIATE FreeRTOS ARCHITECTURE PORT!
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52 /* Scheduler include files. */
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53 #include "FreeRTOS.h"
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57 /* Set mainCREATE_SIMPLE_BLINKY_DEMO_ONLY to one to run the simple blinky demo,
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58 or 0 to run the more comprehensive test and demo application. */
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59 #define mainCREATE_SIMPLE_BLINKY_DEMO_ONLY 0
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61 /*-----------------------------------------------------------*/
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64 * main_blinky() is used when mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 1.
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65 * main_full() is used when mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 0.
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67 #if mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 1
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68 extern void main_blinky( void );
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70 extern void main_full( void );
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73 /* Prototypes for the standard FreeRTOS callback/hook functions implemented
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74 within this file. */
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75 void vApplicationMallocFailedHook( void );
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76 void vApplicationIdleHook( void );
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77 void vApplicationStackOverflowHook( TaskHandle_t pxTask, char *pcTaskName );
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78 void vApplicationTickHook( void );
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80 /* This variable is not actually used, but provided to allow an example of how
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81 to write an ISR to be included in this file. */
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82 static SemaphoreHandle_t xSemaphore = NULL;
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83 /*-----------------------------------------------------------*/
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85 #define portPSW ( 0xc6UL )
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86 volatile uint32_t *pulAddress;
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87 volatile uint32_t ulValue, ulError = 0;
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91 /* Store an address below 0x8000 */
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92 pulAddress = ( uint32_t * ) 0x7fff;
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94 /* Cast and OR with a value that uses the two most significant
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96 ulValue = ( ( uint32_t ) pulAddress ) | ( portPSW << 24UL );
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98 /* This test passes. */
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99 if( ulValue != 0xc6007fff )
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101 /* This line of code is not executed. */
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105 /* Now do the same, but with an address above 0x7fff, but
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106 still slower than the max 16-bit value. */
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107 pulAddress = ( uint32_t * ) 0x8000;
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108 ulValue = ( ( uint32_t ) pulAddress ) | ( portPSW << 24UL );
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110 /* This test *fails*. */
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111 if( ulValue != 0xc6008000 )
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113 /* This line of code *is* executed. */
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118 /* The mainCREATE_SIMPLE_BLINKY_DEMO_ONLY setting is
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119 described at the top of this file. */
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120 #if mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 1
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130 /* Should not get here. See the definitions of main_blinky() and
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134 /*-----------------------------------------------------------*/
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136 void vAnExampleISR_C_Handler( void )
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139 * This demo does not include a functional interrupt service routine - so
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140 * this dummy handler (which is not actually installed) is provided as an
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141 * example of how an ISR that needs to cause a context switch needs to be
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142 * implemented. ISRs that do not cause a context switch have no special
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143 * requirements and can be written as per the compiler documentation.
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145 * This C function is called from a wrapper function that is implemented
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146 * in assembly code. See vANExampleISR_ASM_Wrapper() in ExampleISR.S. Also
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147 * see the documentation page for this demo on the FreeRTOS.org website for
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148 * full instructions.
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150 short sHigherPriorityTaskWoken = pdFALSE;
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152 /* Handler code goes here...*/
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154 /* For purposes of demonstration, assume at some point the hander calls
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155 xSemaphoreGiveFromISR().*/
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156 xSemaphoreGiveFromISR( xSemaphore, &sHigherPriorityTaskWoken );
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158 /* If giving the semaphore unblocked a task, and the unblocked task has a
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159 priority higher than or equal to the currently running task, then
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160 sHigherPriorityTaskWoken will have been set to pdTRUE internally within the
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161 xSemaphoreGiveFromISR() function. Passing a pdTRUE value to
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162 portYIELD_FROM_ISR() will cause this interrupt to return directly to the
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163 higher priority unblocked task. */
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164 portYIELD_FROM_ISR( sHigherPriorityTaskWoken );
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166 /*-----------------------------------------------------------*/
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168 void vApplicationMallocFailedHook( void )
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170 /* Called if a call to pvPortMalloc() fails because there is insufficient
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171 free memory available in the FreeRTOS heap. pvPortMalloc() is called
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172 internally by FreeRTOS API functions that create tasks, queues, software
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173 timers, and semaphores. The size of the FreeRTOS heap is set by the
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174 configTOTAL_HEAP_SIZE configuration constant in FreeRTOSConfig.h. */
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175 taskDISABLE_INTERRUPTS();
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178 /*-----------------------------------------------------------*/
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180 void vApplicationStackOverflowHook( TaskHandle_t pxTask, char *pcTaskName )
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182 ( void ) pcTaskName;
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185 /* Run time stack overflow checking is performed if
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186 configCHECK_FOR_STACK_OVERFLOW is defined to 1 or 2. This hook
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187 function is called if a stack overflow is detected. */
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188 taskDISABLE_INTERRUPTS();
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191 /*-----------------------------------------------------------*/
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193 void vApplicationIdleHook( void )
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195 volatile size_t xFreeHeapSpace;
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197 /* This is just a trivial example of an idle hook. It is called on each
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198 cycle of the idle task. It must *NOT* attempt to block. In this case the
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199 idle task just queries the amount of FreeRTOS heap that remains. See the
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200 memory management section on the http://www.FreeRTOS.org web site for memory
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201 management options. If there is a lot of heap memory free then the
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202 configTOTAL_HEAP_SIZE value in FreeRTOSConfig.h can be reduced to free up
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204 xFreeHeapSpace = xPortGetFreeHeapSize();
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206 /* Remove compiler warning about xFreeHeapSpace being set but never used. */
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207 ( void ) xFreeHeapSpace;
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