2 FreeRTOS.org V5.3.1 - Copyright (C) 2003-2009 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License (version 2) as published
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8 by the Free Software Foundation and modified by the FreeRTOS exception.
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9 **NOTE** The exception to the GPL is included to allow you to distribute a
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10 combined work that includes FreeRTOS.org without being obliged to provide
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11 the source code for any proprietary components. Alternative commercial
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12 license and support terms are also available upon request. See the
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13 licensing section of http://www.FreeRTOS.org for full details.
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15 FreeRTOS.org is distributed in the hope that it will be useful, but WITHOUT
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16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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20 You should have received a copy of the GNU General Public License along
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21 with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59
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22 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 ***************************************************************************
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27 * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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29 * This is a concise, step by step, 'hands on' guide that describes both *
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30 * general multitasking concepts and FreeRTOS specifics. It presents and *
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31 * explains numerous examples that are written using the FreeRTOS API. *
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32 * Full source code for all the examples is provided in an accompanying *
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35 ***************************************************************************
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39 Please ensure to read the configuration and relevant port sections of the
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40 online documentation.
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42 http://www.FreeRTOS.org - Documentation, latest information, license and
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45 http://www.SafeRTOS.com - A version that is certified for use in safety
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48 http://www.OpenRTOS.com - Commercial support, development, porting,
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49 licensing and training services.
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54 * Creates all the demo application tasks, then starts the scheduler. The WEB
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55 * documentation provides more details of the standard demo application tasks
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56 * (which just exist to test the kernel port and provide an example of how to use
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57 * each FreeRTOS API function).
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59 * In addition to the standard demo tasks, the following tasks and tests are
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60 * defined and/or created within this file:
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62 * "LCD" task - the LCD task is a 'gatekeeper' task. It is the only task that
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63 * is permitted to access the display directly. Other tasks wishing to write a
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64 * message to the LCD send the message on a queue to the LCD task instead of
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65 * accessing the LCD themselves. The LCD task just blocks on the queue waiting
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66 * for messages - waking and displaying the messages as they arrive. The use
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67 * of a gatekeeper in this manner permits both tasks and interrupts to write to
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68 * the LCD without worrying about mutual exclusion. This is demonstrated by the
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69 * check hook (see below) which sends messages to the display even though it
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70 * executes from an interrupt context.
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72 * "Check" hook - This only executes fully every five seconds from the tick
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73 * hook. Its main function is to check that all the standard demo tasks are
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74 * still operational. Should any unexpected behaviour be discovered within a
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75 * demo task then the tick hook will write an error to the LCD (via the LCD task).
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76 * If all the demo tasks are executing with their expected behaviour then the
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77 * check hook writes PASS to the LCD (again via the LCD task), as described above.
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78 * The check hook also toggles LED 4 each time it executes.
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80 * LED tasks - These just demonstrate how multiple instances of a single task
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81 * definition can be created. Each LED task simply toggles an LED. The task
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82 * parameter is used to pass the number of the LED to be toggled into the task.
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84 * "uIP" task - This is the task that handles the uIP stack. All TCP/IP
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85 * processing is performed in this task.
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88 /* Standard includes. */
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91 /* Scheduler includes. */
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92 #include "FreeRTOS.h"
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97 /* Hardware library includes. */
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98 #include "LPC17xx_defs.h"
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100 /* Demo app includes. */
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101 #include "BlockQ.h"
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102 #include "integer.h"
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103 #include "blocktim.h"
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105 #include "partest.h"
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106 #include "semtest.h"
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108 #include "GenQTest.h"
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110 #include "recmutex.h"
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112 /*-----------------------------------------------------------*/
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114 /* The number of LED tasks that will be created. */
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115 #define mainNUM_LED_TASKS ( 6 )
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117 /* The time between cycles of the 'check' functionality (defined within the
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119 #define mainCHECK_DELAY ( ( portTickType ) 5000 / portTICK_RATE_MS )
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121 /* Task priorities. */
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122 #define mainQUEUE_POLL_PRIORITY ( tskIDLE_PRIORITY + 2 )
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123 #define mainSEM_TEST_PRIORITY ( tskIDLE_PRIORITY + 1 )
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124 #define mainBLOCK_Q_PRIORITY ( tskIDLE_PRIORITY + 2 )
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125 #define mainUIP_TASK_PRIORITY ( tskIDLE_PRIORITY + 3 )
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126 #define mainLCD_TASK_PRIORITY ( tskIDLE_PRIORITY + 2 )
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127 #define mainINTEGER_TASK_PRIORITY ( tskIDLE_PRIORITY )
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128 #define mainGEN_QUEUE_TASK_PRIORITY ( tskIDLE_PRIORITY )
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129 #define mainFLASH_TASK_PRIORITY ( tskIDLE_PRIORITY + 2 )
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131 /* The WEB server has a larger stack as it utilises stack hungry string
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132 handling library calls. */
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133 #define mainBASIC_WEB_STACK_SIZE ( configMINIMAL_STACK_SIZE * 4 )
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135 /* The length of the queue used to send messages to the LCD task. */
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136 #define mainQUEUE_SIZE ( 3 )
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138 /* The task that is toggled by the check task. */
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139 #define mainCHECK_TASK_LED ( 4 )
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140 /*-----------------------------------------------------------*/
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143 * Configure the hardware for the demo.
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145 static void prvSetupHardware( void );
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148 * Very simple task that toggles an LED.
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150 static void vLEDTask( void *pvParameters );
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153 * The task that handles the uIP stack. All TCP/IP processing is performed in
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156 extern void vuIP_Task( void *pvParameters );
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159 * The LCD gatekeeper task as described in the comments at the top of this file.
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161 static void vLCDTask( void *pvParameters );
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163 /*-----------------------------------------------------------*/
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165 /* The queue used to send messages to the LCD task. */
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166 xQueueHandle xLCDQueue;
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170 /*-----------------------------------------------------------*/
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176 /* Configure the hardware for use by this demo. */
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177 prvSetupHardware();
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179 /* Start the standard demo tasks. These are just here to exercise the
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180 kernel port and provide examples of how the FreeRTOS API can be used. */
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181 vStartBlockingQueueTasks( mainBLOCK_Q_PRIORITY );
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182 vCreateBlockTimeTasks();
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183 vStartSemaphoreTasks( mainSEM_TEST_PRIORITY );
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184 vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY );
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185 vStartIntegerMathTasks( mainINTEGER_TASK_PRIORITY );
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186 vStartGenericQueueTasks( mainGEN_QUEUE_TASK_PRIORITY );
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187 vStartQueuePeekTasks();
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188 vStartRecursiveMutexTasks();
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190 vStartLEDFlashTasks( mainFLASH_TASK_PRIORITY );
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192 /* Create the uIP task. The WEB server runs in this task. */
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193 xTaskCreate( vuIP_Task, ( signed char * ) "uIP", mainBASIC_WEB_STACK_SIZE, ( void * ) NULL, mainUIP_TASK_PRIORITY, NULL );
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195 /* Create the queue used by the LCD task. Messages for display on the LCD
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196 are received via this queue. */
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197 xLCDQueue = xQueueCreate( mainQUEUE_SIZE, sizeof( xLCDMessage ) );
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199 /* Start the LCD gatekeeper task - as described in the comments at the top
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201 xTaskCreate( vLCDTask, ( signed portCHAR * ) "LCD", configMINIMAL_STACK_SIZE * 2, NULL, mainLCD_TASK_PRIORITY, NULL );
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203 /* Start the scheduler. */
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204 vTaskStartScheduler();
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206 /* Will only get here if there was insufficient memory to create the idle
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207 task. The idle task is created within vTaskStartScheduler(). */
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210 /*-----------------------------------------------------------*/
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212 void vLCDTask( void *pvParameters )
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214 xLCDMessage xMessage;
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215 unsigned long ulRow = 0;
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216 char cIPAddr[ 17 ]; /* To fit max IP address length of xxx.xxx.xxx.xxx\0 */
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218 ( void ) pvParameters;
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220 /* The LCD gatekeeper task as described in the comments at the top of this
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223 /* Initialise the LCD and display a startup message that includes the
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224 configured IP address. */
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225 sprintf( cIPAddr, "%d.%d.%d.%d", configIP_ADDR0, configIP_ADDR1, configIP_ADDR2, configIP_ADDR3 );
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229 /* Wait for a message to arrive to be displayed. */
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230 while( xQueueReceive( xLCDQueue, &xMessage, portMAX_DELAY ) != pdPASS );
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234 /*-----------------------------------------------------------*/
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236 void vApplicationTickHook( void )
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238 static xLCDMessage xMessage = { "PASS" };
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239 static unsigned portLONG ulTicksSinceLastDisplay = 0;
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240 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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242 /* Called from every tick interrupt as described in the comments at the top
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245 Have enough ticks passed to make it time to perform our health status
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247 ulTicksSinceLastDisplay++;
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248 if( ulTicksSinceLastDisplay >= mainCHECK_DELAY )
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250 /* Reset the counter so these checks run again in mainCHECK_DELAY
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252 ulTicksSinceLastDisplay = 0;
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254 /* Has an error been found in any task? */
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255 if( xAreGenericQueueTasksStillRunning() != pdTRUE )
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257 xMessage.pcMessage = "ERROR: GEN Q";
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259 else if( xAreQueuePeekTasksStillRunning() != pdTRUE )
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261 xMessage.pcMessage = "ERROR: PEEK Q";
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263 else if( xAreBlockingQueuesStillRunning() != pdTRUE )
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265 xMessage.pcMessage = "ERROR: BLOCK Q";
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267 else if( xAreBlockTimeTestTasksStillRunning() != pdTRUE )
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269 xMessage.pcMessage = "ERROR: BLOCK TIME";
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271 else if( xAreSemaphoreTasksStillRunning() != pdTRUE )
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273 xMessage.pcMessage = "ERROR: SEMAPHR";
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275 else if( xArePollingQueuesStillRunning() != pdTRUE )
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277 xMessage.pcMessage = "ERROR: POLL Q";
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279 else if( xAreIntegerMathsTaskStillRunning() != pdTRUE )
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281 xMessage.pcMessage = "ERROR: INT MATH";
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283 else if( xAreRecursiveMutexTasksStillRunning() != pdTRUE )
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285 xMessage.pcMessage = "ERROR: REC MUTEX";
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288 /* Send the message to the OLED gatekeeper for display. The
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289 xHigherPriorityTaskWoken parameter is not actually used here
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290 as this function is running in the tick interrupt anyway - but
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291 it must still be supplied. */
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292 xHigherPriorityTaskWoken = pdFALSE;
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293 xQueueSendFromISR( xLCDQueue, &xMessage, &xHigherPriorityTaskWoken );
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295 /* Also toggle and LED. This can be done from here because in this port
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296 the LED toggling functions don't use critical sections. */
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297 vParTestToggleLED( mainCHECK_TASK_LED );
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300 /*-----------------------------------------------------------*/
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302 void prvSetupHardware( void )
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304 /* Disable peripherals power. */
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307 /* Enable GPIO power. */
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308 PCONP = PCONP_PCGPIO;
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310 /* Disable TPIU. */
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313 /* Disconnect the main PLL. */
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314 PLL0CON &= ~PLLCON_PLLC;
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315 PLL0FEED = PLLFEED_FEED1;
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316 PLL0FEED = PLLFEED_FEED2;
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317 while ((PLL0STAT & PLLSTAT_PLLC) != 0);
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319 /* Turn off the main PLL. */
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320 PLL0CON &= ~PLLCON_PLLE;
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321 PLL0FEED = PLLFEED_FEED1;
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322 PLL0FEED = PLLFEED_FEED2;
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323 while ((PLL0STAT & PLLSTAT_PLLE) != 0);
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325 /* No CPU clock divider. */
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330 while ((SCS & 0x40) == 0);
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332 /* Use main oscillator. */
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334 PLL0CFG = (PLLCFG_MUL16 | PLLCFG_DIV1);
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336 PLL0FEED = PLLFEED_FEED1;
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337 PLL0FEED = PLLFEED_FEED2;
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339 /* Activate the PLL by turning it on then feeding the correct
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340 sequence of bytes. */
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341 PLL0CON = PLLCON_PLLE;
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342 PLL0FEED = PLLFEED_FEED1;
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343 PLL0FEED = PLLFEED_FEED2;
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345 /* 6x CPU clock divider (64 MHz) */
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348 /* Wait for the PLL to lock. */
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349 while ((PLL0STAT & PLLSTAT_PLOCK) == 0);
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351 /* Connect the PLL. */
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352 PLL0CON = PLLCON_PLLC | PLLCON_PLLE;
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353 PLL0FEED = PLLFEED_FEED1;
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354 PLL0FEED = PLLFEED_FEED2;
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356 /* Setup the peripheral bus to be the same as the PLL output (64 MHz). */
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357 PCLKSEL0 = 0x05555555;
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359 /* Configure LED GPIOs as outputs. */
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364 /*-----------------------------------------------------------*/
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366 void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed portCHAR *pcTaskName )
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368 /* This function will get called if a task overflows its stack. */
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371 ( void ) pcTaskName;
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375 /*-----------------------------------------------------------*/
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377 void vConfigureTimerForRunTimeStats( void )
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379 const unsigned long TCR_COUNT_RESET = 2, CTCR_CTM_TIMER = 0x00, TCR_COUNT_ENABLE = 0x01;
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381 /* This function configures a timer that is used as the time base when
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382 collecting run time statistical information - basically the percentage
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383 of CPU time that each task is utilising. It is called automatically when
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384 the scheduler is started (assuming configGENERATE_RUN_TIME_STATS is set
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387 /* Power up and feed the timer. */
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389 PCLKSEL0 = (PCLKSEL0 & (~(0x3<<2))) | (0x01 << 2);
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391 /* Reset Timer 0 */
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392 T0TCR = TCR_COUNT_RESET;
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394 /* Just count up. */
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395 T0CTCR = CTCR_CTM_TIMER;
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397 /* Prescale to a frequency that is good enough to get a decent resolution,
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398 but not too fast so as to overflow all the time. */
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399 T0PR = ( configCPU_CLOCK_HZ / 10000UL ) - 1UL;
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401 /* Start the counter. */
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402 T0TCR = TCR_COUNT_ENABLE;
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404 /*-----------------------------------------------------------*/
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