2 FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS tutorial books are available in pdf and paperback. *
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10 * Complete, revised, and edited pdf reference manuals are also *
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13 * Purchasing FreeRTOS documentation will not only help you, by *
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14 * ensuring you get running as quickly as possible and with an *
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15 * in-depth knowledge of how to use FreeRTOS, it will also help *
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16 * the FreeRTOS project to continue with its mission of providing *
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17 * professional grade, cross platform, de facto standard solutions *
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18 * for microcontrollers - completely free of charge! *
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20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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22 * Thank you for using FreeRTOS, and thank you for your support! *
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24 ***************************************************************************
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27 This file is part of the FreeRTOS distribution.
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29 FreeRTOS is free software; you can redistribute it and/or modify it under
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30 the terms of the GNU General Public License (version 2) as published by the
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31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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33 >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
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34 distribute a combined work that includes FreeRTOS without being obliged to
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35 provide the source code for proprietary components outside of the FreeRTOS
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38 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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39 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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40 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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41 details. You should have received a copy of the GNU General Public License
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42 and the FreeRTOS license exception along with FreeRTOS; if not it can be
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43 viewed here: http://www.freertos.org/a00114.html and also obtained by
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44 writing to Real Time Engineers Ltd., contact details for whom are available
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45 on the FreeRTOS WEB site.
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49 ***************************************************************************
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51 * Having a problem? Start by reading the FAQ "My application does *
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52 * not run, what could be wrong?" *
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54 * http://www.FreeRTOS.org/FAQHelp.html *
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56 ***************************************************************************
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59 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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60 license and Real Time Engineers Ltd. contact details.
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62 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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63 including FreeRTOS+Trace - an indispensable productivity tool, and our new
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64 fully thread aware and reentrant UDP/IP stack.
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66 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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67 Integrity Systems, who sell the code with commercial support,
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68 indemnification and middleware, under the OpenRTOS brand.
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70 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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71 engineered and independently SIL3 certified version for use in safety and
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72 mission critical applications that require provable dependability.
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76 * Creates all the demo application tasks, then starts the scheduler. The WEB
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77 * documentation provides more details of the demo application tasks.
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79 * This demo is configured to execute on the ES449 prototyping board from
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80 * SoftBaugh. The ES449 has a built in LCD display and a single built in user
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81 * LED. Therefore, in place of flashing an LED, the 'flash' and 'check' tasks
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82 * toggle '*' characters on the LCD. The left most '*' represents LED 0, the
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85 * Main. c also creates a task called 'Check'. This only executes every three
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86 * seconds but has the highest priority so is guaranteed to get processor time.
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87 * Its main function is to check that all the other tasks are still operational.
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88 * Each task that does not flash an LED maintains a unique count that is
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89 * incremented each time the task successfully completes its function. Should
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90 * any error occur within such a task the count is permanently halted. The
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91 * 'check' task inspects the count of each task to ensure it has changed since
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92 * the last time the check task executed. If all the count variables have
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93 * changed all the tasks are still executing error free, and the check task
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94 * toggles an LED with a three second period. Should any task contain an error
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95 * at any time the LED toggle rate will increase to 500ms.
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97 * Please read the documentation for the MSP430 port available on
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98 * http://www.FreeRTOS.org.
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101 /* Standard includes. */
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102 #include <stdlib.h>
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104 /* Scheduler includes. */
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105 #include "FreeRTOS.h"
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108 /* Demo application includes. */
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109 #include "partest.h"
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111 #include "integer.h"
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112 #include "comtest2.h"
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115 /* Constants required for hardware setup. */
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116 #define mainALL_BITS_OUTPUT ( ( unsigned portCHAR ) 0xff )
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117 #define mainMAX_FREQUENCY ( ( unsigned portCHAR ) 121 )
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119 /* Constants that define the LED's used by the various tasks. [in this case
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120 the '*' characters on the LCD represent LED's] */
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121 #define mainCHECK_LED ( 4 )
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122 #define mainCOM_TEST_LED ( 10 )
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124 /* Demo task priorities. */
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125 #define mainCHECK_TASK_PRIORITY ( tskIDLE_PRIORITY + 3 )
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126 #define mainCOM_TEST_PRIORITY ( tskIDLE_PRIORITY + 2 )
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127 #define mainQUEUE_POLL_PRIORITY ( tskIDLE_PRIORITY + 2 )
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128 #define mainLED_TASK_PRIORITY ( tskIDLE_PRIORITY + 1 )
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130 /* Baud rate used by the COM test tasks. */
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131 #define mainCOM_TEST_BAUD_RATE ( ( unsigned portLONG ) 19200 )
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133 /* The frequency at which the 'Check' tasks executes. See the comments at the
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134 top of the page. When the system is operating error free the 'Check' task
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135 toggles an LED every three seconds. If an error is discovered in any task the
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136 rate is increased to 500 milliseconds. [in this case the '*' characters on the
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137 LCD represent LED's]*/
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138 #define mainNO_ERROR_CHECK_DELAY ( ( portTickType ) 3000 / portTICK_RATE_MS )
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139 #define mainERROR_CHECK_DELAY ( ( portTickType ) 500 / portTICK_RATE_MS )
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141 /* The constants used in the calculation. */
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142 #define intgCONST1 ( ( portLONG ) 123 )
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143 #define intgCONST2 ( ( portLONG ) 234567 )
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144 #define intgCONST3 ( ( portLONG ) -3 )
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145 #define intgCONST4 ( ( portLONG ) 7 )
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146 #define intgEXPECTED_ANSWER ( ( ( intgCONST1 + intgCONST2 ) * intgCONST3 ) / intgCONST4 )
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149 * The function that implements the Check task. See the comments at the head
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150 * of the page for implementation details.
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152 static void vErrorChecks( void *pvParameters );
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155 * Called by the Check task. Returns pdPASS if all the other tasks are found
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156 * to be operating without error - otherwise returns pdFAIL.
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158 static portSHORT prvCheckOtherTasksAreStillRunning( void );
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161 * Perform the hardware setup required by the ES449 in order to run the demo
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164 static void prvSetupHardware( void );
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167 portBASE_TYPE xLocalError = pdFALSE;
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168 volatile unsigned portLONG ulIdleLoops = 0UL;
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170 /*-----------------------------------------------------------*/
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173 * Start the demo application tasks - then start the real time scheduler.
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177 /* Setup the hardware ready for the demo. */
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178 prvSetupHardware();
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179 vParTestInitialise();
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181 /* Start the standard demo application tasks. */
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182 vStartLEDFlashTasks( mainLED_TASK_PRIORITY );
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183 vStartIntegerMathTasks( tskIDLE_PRIORITY );
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184 vAltStartComTestTasks( mainCOM_TEST_PRIORITY, mainCOM_TEST_BAUD_RATE, mainCOM_TEST_LED - 1 );
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185 vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY );
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187 /* Start the 'Check' task which is defined in this file. */
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188 xTaskCreate( vErrorChecks, ( const signed portCHAR * const ) "Check", configMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY, NULL );
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190 /* Start the scheduler. */
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191 vTaskStartScheduler();
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193 /* As the scheduler has been started the demo applications tasks will be
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194 executing and we should never get here! */
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197 /*-----------------------------------------------------------*/
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199 static portTASK_FUNCTION( vErrorChecks, pvParameters )
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201 portTickType xDelayPeriod = mainNO_ERROR_CHECK_DELAY;
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203 /* Cycle for ever, delaying then checking all the other tasks are still
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204 operating without error. */
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207 /* Wait until it is time to check again. The time we wait here depends
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208 on whether an error has been detected or not. When an error is
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209 detected the time is shortened resulting in a faster LED flash rate. */
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210 vTaskDelay( xDelayPeriod );
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212 /* See if the other tasks are all ok. */
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213 if( prvCheckOtherTasksAreStillRunning() != pdPASS )
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215 /* An error occurred in one of the tasks so shorten the delay
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216 period - which has the effect of increasing the frequency of the
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218 xDelayPeriod = mainERROR_CHECK_DELAY;
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222 vParTestToggleLED( mainCHECK_LED );
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225 /*-----------------------------------------------------------*/
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227 static portSHORT prvCheckOtherTasksAreStillRunning( void )
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229 static portSHORT sNoErrorFound = pdTRUE;
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230 static unsigned portLONG ulLastIdleLoopCount = 0UL;
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232 /* The demo tasks maintain a count that increments every cycle of the task
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233 provided that the task has never encountered an error. This function
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234 checks the counts maintained by the tasks to ensure they are still being
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235 incremented. A count remaining at the same value between calls therefore
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236 indicates that an error has been detected. Only tasks that do not flash
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237 an LED are checked. */
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239 if( xAreIntegerMathsTaskStillRunning() != pdTRUE )
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241 sNoErrorFound = pdFALSE;
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244 if( xAreComTestTasksStillRunning() != pdTRUE )
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246 sNoErrorFound = pdFALSE;
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249 if( xArePollingQueuesStillRunning() != pdTRUE )
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251 sNoErrorFound = pdFALSE;
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254 if( xLocalError == pdTRUE )
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256 sNoErrorFound = pdFALSE;
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259 if( ulIdleLoops == ulLastIdleLoopCount )
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261 sNoErrorFound = pdFALSE;
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265 ulLastIdleLoopCount = ulIdleLoops;
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268 return sNoErrorFound;
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270 /*-----------------------------------------------------------*/
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272 static void prvSetupHardware( void )
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274 /* Stop the watchdog. */
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275 WDTCTL = WDTPW + WDTHOLD;
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277 /* Setup DCO+ for ( xtal * D * (N + 1) ) operation. */
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278 FLL_CTL0 |= DCOPLUS + XCAP18PF;
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280 /* X2 DCO frequency, 8MHz nominal DCO */
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283 /* (121+1) x 32768 x 2 = 7.99 Mhz */
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284 SCFQCTL = mainMAX_FREQUENCY;
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286 /* Setup the IO. This is just copied from the demo supplied by SoftBaugh
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287 for the ES449 demo board. */
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294 /*-----------------------------------------------------------*/
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296 /* The idle hook is just a copy of the standard integer maths tasks. See
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297 Demo/Common/integer.c for rationale. */
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299 void vApplicationIdleHook( void )
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301 /* These variables are all effectively set to constants so they are volatile to
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302 ensure the compiler does not just get rid of them. */
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303 volatile portLONG lValue;
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305 /* Keep performing a calculation and checking the result against a constant. */
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308 /* Perform the calculation. This will store partial value in
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309 registers, resulting in a good test of the context switch mechanism. */
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310 lValue = intgCONST1;
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311 lValue += intgCONST2;
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313 /* Yield in case cooperative scheduling is being used. */
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314 #if configUSE_PREEMPTION == 0
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320 /* Finish off the calculation. */
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321 lValue *= intgCONST3;
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322 lValue /= intgCONST4;
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324 /* If the calculation is found to be incorrect we stop setting the
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325 TaskHasExecuted variable so the check task can see an error has
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327 if( lValue != intgEXPECTED_ANSWER ) /*lint !e774 volatile used to prevent this being optimised out. */
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329 /* Don't bother with mutual exclusion - it is only read from the
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330 check task and never written. */
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331 xLocalError = pdTRUE;
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333 /* Yield in case cooperative scheduling is being used. */
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334 #if configUSE_PREEMPTION == 0
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342 /* Place the processor into low power mode. */
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