2 * FreeRTOS Kernel V10.0.0
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3 * Copyright (C) 2017 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. If you wish to use our Amazon
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14 * FreeRTOS name, please do so in a fair use way that does not cause confusion.
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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18 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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19 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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20 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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23 * http://www.FreeRTOS.org
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24 * http://aws.amazon.com/freertos
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26 * 1 tab == 4 spaces!
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29 /******************************************************************************
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30 * This project provides two demo applications. A simple blinky style project,
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31 * and a more comprehensive test and demo application. The
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32 * mainCREATE_SIMPLE_BLINKY_DEMO_ONLY setting (defined in this file) is used to
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33 * select between the two. The simply blinky demo is implemented and described
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34 * in main_blinky.c. The more comprehensive test and demo application is
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35 * implemented and described in main_full.c.
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37 * This file implements the code that is not demo specific, including the
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38 * hardware setup and FreeRTOS hook functions. It also contains a dummy
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39 * interrupt service routine called Dummy_IRQHandler() that is provided as an
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40 * example of how to use interrupt safe FreeRTOS API functions (those that end
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43 *****************************************************************************/
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45 /* Standard includes. */
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48 /* FreeRTOS includes. */
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49 #include "FreeRTOS.h"
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52 /* Hardware specific includes. */
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53 #include "lpc11xx.h"
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55 /* Set mainCREATE_SIMPLE_BLINKY_DEMO_ONLY to one to run the simple blinky demo,
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56 or 0 to run the more comprehensive test and demo application. */
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57 #define mainCREATE_SIMPLE_BLINKY_DEMO_ONLY 0
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59 /* The bit on port 0 to which the LED is wired. */
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60 #define mainLED_BIT ( 1UL << 7UL )
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62 /* The configCHECK_FOR_STACK_OVERFLOW setting in FreeRTOSConifg can be used to
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63 check task stacks for overflows. It does not however check the stack used by
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64 interrupts. This demo has a simple addition that will also check the stack used
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65 by interrupts if mainCHECK_INTERRUPT_STACK is set to 1. Note that this check is
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66 only performed from the tick hook function (which runs in an interrupt context).
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67 It is a good debugging aid - but won't catch interrupt stack problems until the
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68 tick interrupt next executes. */
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69 #define mainCHECK_INTERRUPT_STACK 1
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70 #if mainCHECK_INTERRUPT_STACK == 1
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71 const unsigned char ucExpectedInterruptStackValues[] = { 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC };
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74 /*-----------------------------------------------------------*/
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77 * Perform any application specific hardware configuration. The clocks,
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78 * memory, etc. are configured before main() is called.
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80 static void prvSetupHardware( void );
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83 * The hardware only has a single LED. Simply toggle it.
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85 void vMainToggleLED( void );
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87 /* main_blinky() is used when mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 1.
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88 main_full() is used when mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 0. */
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89 void main_blinky( void );
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90 void main_full( void );
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92 /*-----------------------------------------------------------*/
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94 /* The GPIO port to which the LED is attached. */
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95 static LPC_GPIO_TypeDef * const xGPIO0 = LPC_GPIO0;
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97 /*-----------------------------------------------------------*/
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100 /* Prepare the hardware to run this demo. */
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101 prvSetupHardware();
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103 /* The mainCREATE_SIMPLE_BLINKY_DEMO_ONLY setting is described at the top
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105 #if mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 1
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117 /*-----------------------------------------------------------*/
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119 void vMainToggleLED( void )
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121 static unsigned long ulLEDState = 0UL;
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123 if( ulLEDState == 0UL )
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125 xGPIO0->MASKED_ACCESS[ mainLED_BIT ] = 0UL;
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129 xGPIO0->MASKED_ACCESS[ mainLED_BIT ] = mainLED_BIT;
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132 ulLEDState = !ulLEDState;
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134 /*-----------------------------------------------------------*/
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136 static void prvSetupHardware( void )
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138 extern unsigned long _vStackTop[], _pvHeapStart[];
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139 unsigned long ulInterruptStackSize;
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141 /* Enable AHB clock for GPIO. */
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142 LPC_SYSCON->SYSAHBCLKCTRL |= ( 1 << 6 );
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144 /* Configure GPIO for LED output. */
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145 xGPIO0->DIR |= mainLED_BIT;
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147 /* The size of the stack used by main and interrupts is not defined in
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148 the linker, but just uses whatever RAM is left. Calculate the amount of
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149 RAM available for the main/interrupt/system stack, and check it against
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150 a reasonable number. If this assert is hit then it is likely you don't
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151 have enough stack to start the kernel, or to allow interrupts to nest.
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152 Note - this is separate to the stacks that are used by tasks. The stacks
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153 that are used by tasks are automatically checked if
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154 configCHECK_FOR_STACK_OVERFLOW is not 0 in FreeRTOSConfig.h - but the stack
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155 used by interrupts is not. Reducing the conifgTOTAL_HEAP_SIZE setting will
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156 increase the stack available to main() and interrupts. */
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157 ulInterruptStackSize = ( ( unsigned long ) _vStackTop ) - ( ( unsigned long ) _pvHeapStart );
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158 configASSERT( ulInterruptStackSize > 350UL );
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160 /* Fill the stack used by main() and interrupts to a known value, so its
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161 use can be manually checked. */
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162 memcpy( ( void * ) _pvHeapStart, ucExpectedInterruptStackValues, sizeof( ucExpectedInterruptStackValues ) );
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164 /*-----------------------------------------------------------*/
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166 void vApplicationMallocFailedHook( void )
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168 /* vApplicationMallocFailedHook() will only be called if
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169 configUSE_MALLOC_FAILED_HOOK is set to 1 in FreeRTOSConfig.h. It is a hook
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170 function that will get called if a call to pvPortMalloc() fails.
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171 pvPortMalloc() is called internally by the kernel whenever a task, queue,
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172 timer or semaphore is created. It is also called by various parts of the
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173 demo application. If heap_1.c or heap_2.c are used, then the size of the
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174 heap available to pvPortMalloc() is defined by configTOTAL_HEAP_SIZE in
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175 FreeRTOSConfig.h, and the xPortGetFreeHeapSize() API function can be used
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176 to query the size of free heap space that remains (although it does not
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177 provide information on how the remaining heap might be fragmented). */
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178 taskDISABLE_INTERRUPTS();
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181 /*-----------------------------------------------------------*/
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183 void vApplicationIdleHook( void )
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185 /* vApplicationIdleHook() will only be called if configUSE_IDLE_HOOK is set
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186 to 1 in FreeRTOSConfig.h. It will be called on each iteration of the idle
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187 task. It is essential that code added to this hook function never attempts
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188 to block in any way (for example, call xQueueReceive() with a block time
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189 specified, or call vTaskDelay()). If the application makes use of the
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190 vTaskDelete() API function (as this demo application does) then it is also
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191 important that vApplicationIdleHook() is permitted to return to its calling
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192 function, because it is the responsibility of the idle task to clean up
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193 memory allocated by the kernel to any task that has since been deleted. */
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195 /*-----------------------------------------------------------*/
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197 void vApplicationStackOverflowHook( TaskHandle_t pxTask, char *pcTaskName )
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199 ( void ) pcTaskName;
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202 /* Run time stack overflow checking is performed if
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203 configCHECK_FOR_STACK_OVERFLOW is defined to 1 or 2. This hook
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204 function is called if a stack overflow is detected. */
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205 taskDISABLE_INTERRUPTS();
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208 /*-----------------------------------------------------------*/
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210 void vApplicationTickHook( void )
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212 #if mainCHECK_INTERRUPT_STACK == 1
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213 extern unsigned long _pvHeapStart[];
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215 /* This function will be called by each tick interrupt if
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216 configUSE_TICK_HOOK is set to 1 in FreeRTOSConfig.h. User code can be
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217 added here, but the tick hook is called from an interrupt context, so
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218 code must not attempt to block, and only the interrupt safe FreeRTOS API
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219 functions can be used (those that end in FromISR()). */
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221 /* Manually check the last few bytes of the interrupt stack to check they
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222 have not been overwritten. Note - the task stacks are automatically
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223 checked for overflow if configCHECK_FOR_STACK_OVERFLOW is set to 1 or 2
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224 in FreeRTOSConifg.h, but the interrupt stack is not. */
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225 configASSERT( memcmp( ( void * ) _pvHeapStart, ucExpectedInterruptStackValues, sizeof( ucExpectedInterruptStackValues ) ) == 0U );
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226 #endif /* mainCHECK_INTERRUPT_STACK */
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228 /*-----------------------------------------------------------*/
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230 #ifdef JUST_AN_EXAMPLE_ISR
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232 void Dummy_IRQHandler(void)
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234 long lHigherPriorityTaskWoken = pdFALSE;
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236 /* Clear the interrupt if necessary. */
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237 Dummy_ClearITPendingBit();
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239 /* This interrupt does nothing more than demonstrate how to synchronise a
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240 task with an interrupt. A semaphore is used for this purpose. Note
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241 lHigherPriorityTaskWoken is initialised to zero. Only FreeRTOS API functions
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242 that end in "FromISR" can be called from an ISR. */
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243 xSemaphoreGiveFromISR( xTestSemaphore, &lHigherPriorityTaskWoken );
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245 /* If there was a task that was blocked on the semaphore, and giving the
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246 semaphore caused the task to unblock, and the unblocked task has a priority
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247 higher than the current Running state task (the task that this interrupt
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248 interrupted), then lHigherPriorityTaskWoken will have been set to pdTRUE
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249 internally within xSemaphoreGiveFromISR(). Passing pdTRUE into the
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250 portEND_SWITCHING_ISR() macro will result in a context switch being pended to
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251 ensure this interrupt returns directly to the unblocked, higher priority,
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252 task. Passing pdFALSE into portEND_SWITCHING_ISR() has no effect. */
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253 portEND_SWITCHING_ISR( lHigherPriorityTaskWoken );
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256 #endif /* JUST_AN_EXAMPLE_ISR */
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