2 FreeRTOS V7.0.1 - Copyright (C) 2011 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 http://www.FreeRTOS.org - Documentation, latest information, license and
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47 http://www.SafeRTOS.com - A version that is certified for use in safety
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50 http://www.OpenRTOS.com - Commercial support, development, porting,
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51 licensing and training services.
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55 * Creates all the demo application tasks, then starts the scheduler. The WEB
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56 * documentation provides more details of the demo application tasks.
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58 * This demo is configured to execute on the ES449 prototyping board from
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59 * SoftBaugh. The ES449 has a built in LCD display and a single built in user
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60 * LED. Therefore, in place of flashing an LED, the 'flash' and 'check' tasks
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61 * toggle '*' characters on the LCD. The left most '*' represents LED 0, the
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64 * Main. c also creates a task called 'Check'. This only executes every three
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65 * seconds but has the highest priority so is guaranteed to get processor time.
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66 * Its main function is to check that all the other tasks are still operational.
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67 * Each task that does not flash an LED maintains a unique count that is
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68 * incremented each time the task successfully completes its function. Should
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69 * any error occur within such a task the count is permanently halted. The
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70 * 'check' task inspects the count of each task to ensure it has changed since
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71 * the last time the check task executed. If all the count variables have
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72 * changed all the tasks are still executing error free, and the check task
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73 * toggles an LED with a three second period. Should any task contain an error
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74 * at any time the LED toggle rate will increase to 500ms.
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76 * Please read the documentation for the MSP430 port available on
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77 * http://www.FreeRTOS.org.
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80 /* Standard includes. */
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84 /* Scheduler includes. */
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85 #include "FreeRTOS.h"
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88 /* Demo application includes. */
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89 #include "partest.h"
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91 #include "integer.h"
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92 #include "comtest2.h"
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95 /* Constants required for hardware setup. */
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96 #define mainALL_BITS_OUTPUT ( ( unsigned char ) 0xff )
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97 #define mainMAX_FREQUENCY ( ( unsigned char ) 121 )
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99 /* Constants that define the LED's used by the various tasks. [in this case
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100 the '*' characters on the LCD represent LED's] */
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101 #define mainCHECK_LED ( 4 )
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102 #define mainCOM_TEST_LED ( 10 )
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104 /* Demo task priorities. */
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105 #define mainCHECK_TASK_PRIORITY ( tskIDLE_PRIORITY + 3 )
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106 #define mainCOM_TEST_PRIORITY ( tskIDLE_PRIORITY + 2 )
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107 #define mainQUEUE_POLL_PRIORITY ( tskIDLE_PRIORITY + 2 )
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108 #define mainLED_TASK_PRIORITY ( tskIDLE_PRIORITY + 1 )
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110 /* Baud rate used by the COM test tasks. */
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111 #define mainCOM_TEST_BAUD_RATE ( ( unsigned long ) 19200 )
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113 /* The frequency at which the 'Check' tasks executes. See the comments at the
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114 top of the page. When the system is operating error free the 'Check' task
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115 toggles an LED every three seconds. If an error is discovered in any task the
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116 rate is increased to 500 milliseconds. [in this case the '*' characters on the
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117 LCD represent LED's]*/
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118 #define mainNO_ERROR_CHECK_DELAY ( ( portTickType ) 3000 / portTICK_RATE_MS )
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119 #define mainERROR_CHECK_DELAY ( ( portTickType ) 500 / portTICK_RATE_MS )
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122 * The function that implements the Check task. See the comments at the head
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123 * of the page for implementation details.
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125 static void vErrorChecks( void *pvParameters );
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128 * Called by the Check task. Returns pdPASS if all the other tasks are found
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129 * to be operating without error - otherwise returns pdFAIL.
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131 static short prvCheckOtherTasksAreStillRunning( void );
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134 * Perform the hardware setup required by the ES449 in order to run the demo
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137 static void prvSetupHardware( void );
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139 /* Used to detect the idle hook function stalling. */
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140 static volatile unsigned long ulIdleLoops = 0UL;
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142 /*-----------------------------------------------------------*/
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145 * Start the demo application tasks - then start the real time scheduler.
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149 /* Setup the hardware ready for the demo. */
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150 prvSetupHardware();
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151 vParTestInitialise();
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153 /* Start the standard demo application tasks. */
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154 vStartLEDFlashTasks( mainLED_TASK_PRIORITY );
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155 vStartIntegerMathTasks( tskIDLE_PRIORITY );
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156 vAltStartComTestTasks( mainCOM_TEST_PRIORITY, mainCOM_TEST_BAUD_RATE, mainCOM_TEST_LED - 1 );
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157 vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY );
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159 /* Start the 'Check' task which is defined in this file. */
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160 xTaskCreate( vErrorChecks, "Check", configMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY, NULL );
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162 /* Start the scheduler. */
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163 vTaskStartScheduler();
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165 /* As the scheduler has been started the demo applications tasks will be
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166 executing and we should never get here! */
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169 /*-----------------------------------------------------------*/
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171 static void vErrorChecks( void *pvParameters )
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173 static volatile unsigned long ulDummyVariable = 3UL;
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174 portTickType xDelayPeriod = mainNO_ERROR_CHECK_DELAY;
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176 /* Cycle for ever, delaying then checking all the other tasks are still
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177 operating without error. */
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180 /* Wait until it is time to check again. The time we wait here depends
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181 on whether an error has been detected or not. When an error is
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182 detected the time is shortened resulting in a faster LED flash rate. */
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183 vTaskDelay( xDelayPeriod );
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185 /* Perform a bit of 32bit maths to ensure the registers used by the
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186 integer tasks get some exercise outside of the integer tasks
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187 themselves. The result here is not important we are just deliberately
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188 changing registers used by other tasks to ensure that their context
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189 switch is operating as required. - see the demo application
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190 documentation for more info. */
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191 ulDummyVariable *= 3UL;
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193 /* See if the other tasks are all ok. */
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194 if( prvCheckOtherTasksAreStillRunning() != pdPASS )
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196 /* An error occurred in one of the tasks so shorten the delay
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197 period - which has the effect of increasing the frequency of the
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199 xDelayPeriod = mainERROR_CHECK_DELAY;
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203 vParTestToggleLED( mainCHECK_LED );
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206 /*-----------------------------------------------------------*/
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208 static short prvCheckOtherTasksAreStillRunning( void )
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210 static short sNoErrorFound = pdTRUE;
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211 static unsigned long ulLastIdleLoops = 0UL;
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213 /* The demo tasks maintain a count that increments every cycle of the task
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214 provided that the task has never encountered an error. This function
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215 checks the counts maintained by the tasks to ensure they are still being
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216 incremented. A count remaining at the same value between calls therefore
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217 indicates that an error has been detected. Only tasks that do not flash
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218 an LED are checked. */
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220 if( xAreIntegerMathsTaskStillRunning() != pdTRUE )
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222 sNoErrorFound = pdFALSE;
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225 if( xAreComTestTasksStillRunning() != pdTRUE )
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227 sNoErrorFound = pdFALSE;
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230 if( xArePollingQueuesStillRunning() != pdTRUE )
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232 sNoErrorFound = pdFALSE;
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235 if( ulLastIdleLoops == ulIdleLoops )
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237 sNoErrorFound = pdFALSE;
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240 ulLastIdleLoops = ulIdleLoops;
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242 return sNoErrorFound;
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244 /*-----------------------------------------------------------*/
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246 static void prvSetupHardware( void )
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248 /* Stop the watchdog. */
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249 WDTCTL = WDTPW + WDTHOLD;
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251 /* Setup DCO+ for ( xtal * D * (N + 1) ) operation. */
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252 FLL_CTL0 |= DCOPLUS + XCAP18PF;
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254 /* X2 DCO frequency, 8MHz nominal DCO */
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257 /* (121+1) x 32768 x 2 = 7.99 Mhz */
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258 SCFQCTL = mainMAX_FREQUENCY;
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260 /* Setup the IO as per the SoftBaugh demo for the same target hardware. */
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267 /*-----------------------------------------------------------*/
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269 void vApplicationIdleHook( void );
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270 void vApplicationIdleHook( void )
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272 /* Simple put the CPU into lowpower mode. */
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273 _BIS_SR( LPM3_bits );
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276 /*-----------------------------------------------------------*/
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