2 FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
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5 ***************************************************************************
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7 * FreeRTOS tutorial books are available in pdf and paperback. *
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8 * Complete, revised, and edited pdf reference manuals are also *
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11 * Purchasing FreeRTOS documentation will not only help you, by *
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12 * ensuring you get running as quickly as possible and with an *
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13 * in-depth knowledge of how to use FreeRTOS, it will also help *
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14 * the FreeRTOS project to continue with its mission of providing *
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15 * professional grade, cross platform, de facto standard solutions *
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16 * for microcontrollers - completely free of charge! *
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18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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20 * Thank you for using FreeRTOS, and thank you for your support! *
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22 ***************************************************************************
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25 This file is part of the FreeRTOS distribution.
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27 FreeRTOS is free software; you can redistribute it and/or modify it under
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28 the terms of the GNU General Public License (version 2) as published by the
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29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 >>>NOTE<<< The modification to the GPL is included to allow you to
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31 distribute a combined work that includes FreeRTOS without being obliged to
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32 provide the source code for proprietary components outside of the FreeRTOS
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33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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35 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 more details. You should have received a copy of the GNU General Public
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37 License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 by writing to Richard Barry, contact details for whom are available on the
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44 ***************************************************************************
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46 * Having a problem? Start by reading the FAQ "My application does *
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47 * not run, what could be wrong? *
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49 * http://www.FreeRTOS.org/FAQHelp.html *
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51 ***************************************************************************
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54 http://www.FreeRTOS.org - Documentation, training, latest information,
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55 license and contact details.
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57 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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58 including FreeRTOS+Trace - an indispensable productivity tool.
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60 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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61 the code with commercial support, indemnification, and middleware, under
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62 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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63 provide a safety engineered and independently SIL3 certified version under
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64 the SafeRTOS brand: http://www.SafeRTOS.com.
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69 * Defines the 'dice' tasks as described at the top of main.c
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73 /* Kernel includes. */
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74 #include "FreeRTOS.h"
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78 /* Delays used within the dice functionality. All delays are defined in milliseconds. */
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79 #define diceDELAY_BETWEEN_RANDOM_NUMBERS_ms ( 20 / portTICK_RATE_MS )
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80 #define diceSHAKE_TIME ( ( 2000 / portTICK_RATE_MS ) / diceDELAY_BETWEEN_RANDOM_NUMBERS_ms )
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81 #define diceSHORT_PAUSE_BEFORE_SHAKE ( 250 / portTICK_RATE_MS )
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82 #define diceDELAY_WHILE_DISPLAYING_RESULT ( 5000 / portTICK_RATE_MS )
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84 /* Macro to access the display ports. */
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85 #define dice7SEG_Value( x ) ( *( pucDisplayOutput[ x ] ) )
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87 /* Checks the semaphore use to communicate button push events. A block time
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88 can be specified - this is the time to wait for a button push to occur should
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89 one have not already occurred. */
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90 #define prvButtonHit( ucIndex, xTicksToWait ) xSemaphoreTake( xSemaphores[ ucIndex ], xTicksToWait )
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92 /* Defines the outputs required for each digit on the display. */
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93 static const char cDisplaySegments[ 2 ][ 11 ] =
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95 { 0x48, 0xeb, 0x8c, 0x89, 0x2b, 0x19, 0x18, 0xcb, 0x08, 0x09, 0xf7 }, /* Left display. */
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96 { 0xa0, 0xf3, 0xc4, 0xc1, 0x93, 0x89, 0x88, 0xe3, 0x80, 0x81, 0x7f } /* Right display. */
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99 /* The semaphores used to communicate button push events between the button
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100 input interrupt handlers and the dice tasks. Two dice tasks are created so two
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101 semaphores are required. */
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102 static xSemaphoreHandle xSemaphores[ 2 ] = { 0 };
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104 /* Defines the ports used to write to the display. This variable is defined in
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105 partest.c, which contains the LED set/clear/toggle functions. */
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106 extern volatile unsigned char *pucDisplayOutput[ 2 ];
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108 /*-----------------------------------------------------------*/
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111 * Defines the 'dice' tasks as described at the top of main.c
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113 void vDiceTask( void *pvParameters )
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115 unsigned char ucDiceValue, ucIndex;
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116 unsigned long ulDiceRunTime;
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117 extern void vSuspendFlashTasks( unsigned char ucIndex, short sSuspendTasks );
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121 /* Two instances of this task are created so the task parameter is used
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122 to pass in a constant that indicates whether this task is controlling
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123 the left side or right side display. The constant is used as an index
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124 into the arrays defined at file scope within this file. */
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125 ucIndex = ( unsigned char ) pvParameters;
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127 /* A binary semaphore is used to signal button push events. Create the
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128 semaphore before it is used. */
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129 vSemaphoreCreateBinary( xSemaphores[ ucIndex ] );
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131 /* Make sure the semaphore starts in the wanted state - no button pushes
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132 pending. This call will just clear any button pushes that are latched.
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133 Passing in 0 as the block time means the call will not wait for any further
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134 button pushes but instead return immediately. */
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135 prvButtonHit( ucIndex, 0 );
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137 /* Seed the random number generator. */
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138 srand( ( unsigned char ) diceSHAKE_TIME );
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143 /* Start the task proper. A loop will be performed each time a button is
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144 pushed. The task will remain in the blocked state (sleeping) until a
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145 button is pushed. */
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148 /* Wait for a button push. This task will enter the Blocked state
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149 (will not run again) until after a button has been pushed. */
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150 prvButtonHit( ucIndex, portMAX_DELAY );
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152 /* The next line will only execute after a button has been pushed -
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153 initialise the variable used to control the time the dice is shaken
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155 ulDiceRunTime = diceSHAKE_TIME;
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157 /* Suspend the flash tasks so this task has exclusive access to the
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159 vSuspendFlashTasks( ucIndex, pdTRUE );
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161 /* Clear the display and pause for a short time, before starting to
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163 *pucDisplayOutput[ ucIndex ] = 0xff;
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164 vTaskDelay( diceSHORT_PAUSE_BEFORE_SHAKE );
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166 /* Keep generating and displaying random numbers until the shake time
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168 while( ulDiceRunTime > 0 )
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172 /* Generate and display a random number. */
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173 ucDiceValue = rand() % 6 + 1;
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174 dice7SEG_Value( ucIndex ) = ( dice7SEG_Value( ucIndex ) | 0xf7 ) & cDisplaySegments[ ucIndex ][ ucDiceValue ];
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176 /* Block/sleep for a very short time before generating the next
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178 vTaskDelay( diceDELAY_BETWEEN_RANDOM_NUMBERS_ms );
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183 /* Clear any button pushes that are pending because a button bounced, or
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184 was pressed while the dice were shaking. Again a block time of zero is
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185 used so the function does not wait for any pushes but instead returns
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187 prvButtonHit( ucIndex, 0 );
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189 /* Delay for a short while to display the dice shake result. Use a queue
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190 peek here instead of a vTaskDelay() allows the delay to be interrupted by
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191 a button push. If a button is pressed xQueuePeek() will return but the
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192 button push will remain pending to be read again at the top of this for
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193 loop. It is safe to uses a queue function on a semaphore handle as
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194 semaphores are implemented as macros that uses queues, so the two are
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195 basically the same thing. */
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196 xQueuePeek( xSemaphores[ ucIndex ], NULL, diceDELAY_WHILE_DISPLAYING_RESULT );
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198 /* Clear the display then resume the tasks or co-routines that were using
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199 the segments of the display. */
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200 *pucDisplayOutput[ ucIndex ] = 0xff;
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201 vSuspendFlashTasks( ucIndex, pdFALSE );
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204 /*-----------------------------------------------------------*/
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206 /* Handler for the SW2 button push interrupt. */
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207 __interrupt void vExternalInt8Handler( void )
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209 short sHigherPriorityTaskWoken = pdFALSE;
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211 /* Reset the interrupt. */
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214 /* Check the semaphore has been created before attempting to use it. */
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215 if( xSemaphores[ configLEFT_DISPLAY ] != NULL )
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217 /* Send a message via the semaphore to the dice task that controls the
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218 left side display. This will unblock the task if it is blocked waiting
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219 for a button push. */
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220 xSemaphoreGiveFromISR( xSemaphores[ configLEFT_DISPLAY ], &sHigherPriorityTaskWoken );
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223 /* If sending the semaphore unblocked a task, and the unblocked task has a
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224 priority that is higher than the currently running task, then force a context
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226 if( sHigherPriorityTaskWoken != pdFALSE )
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228 portYIELD_FROM_ISR();
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231 /*-----------------------------------------------------------*/
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233 /* As per vExternalInt8Handler(), but for SW3 and the right side display. */
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234 __interrupt void vExternalInt9Handler( void )
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236 short sHigherPriorityTaskWoken = pdFALSE;
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238 /* Reset the interrupt. */
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241 if( xSemaphores[ configRIGHT_DISPLAY ] != NULL )
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243 xSemaphoreGiveFromISR( xSemaphores[ configRIGHT_DISPLAY ], &sHigherPriorityTaskWoken );
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246 if( sHigherPriorityTaskWoken != pdFALSE )
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248 portYIELD_FROM_ISR();
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