2 FreeRTOS V7.5.0 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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6 ***************************************************************************
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8 * FreeRTOS provides completely free yet professionally developed, *
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9 * robust, strictly quality controlled, supported, and cross *
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10 * platform software that has become a de facto standard. *
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12 * Help yourself get started quickly and support the FreeRTOS *
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13 * project by purchasing a FreeRTOS tutorial book, reference *
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14 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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18 ***************************************************************************
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20 This file is part of the FreeRTOS distribution.
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22 FreeRTOS is free software; you can redistribute it and/or modify it under
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23 the terms of the GNU General Public License (version 2) as published by the
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24 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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26 >>! NOTE: The modification to the GPL is included to allow you to distribute
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27 >>! a combined work that includes FreeRTOS without being obliged to provide
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28 >>! the source code for proprietary components outside of the FreeRTOS
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31 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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32 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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33 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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34 link: http://www.freertos.org/a00114.html
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38 ***************************************************************************
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40 * Having a problem? Start by reading the FAQ "My application does *
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41 * not run, what could be wrong?" *
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43 * http://www.FreeRTOS.org/FAQHelp.html *
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45 ***************************************************************************
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47 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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48 license and Real Time Engineers Ltd. contact details.
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50 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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51 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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52 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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54 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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55 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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56 licenses offer ticketed support, indemnification and middleware.
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58 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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59 engineered and independently SIL3 certified version for use in safety and
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60 mission critical applications that require provable dependability.
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65 /******************************************************************************
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66 * This project provides two demo applications. A simple blinky style project,
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67 * and a more comprehensive test and demo application. The
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68 * mainCREATE_SIMPLE_BLINKY_DEMO_ONLY setting (defined in this file) is used to
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69 * select between the two. The simply blinky demo is implemented and described
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70 * in main_blinky.c. The more comprehensive test and demo application is
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71 * implemented and described in main_full.c.
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73 * This file implements the code that is not demo specific, including the
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74 * hardware setup and FreeRTOS hook functions. It also contains a dummy
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75 * interrupt service routine called Dummy_IRQHandler() that is provided as an
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76 * example of how to use interrupt safe FreeRTOS API functions (those that end
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79 *****************************************************************************/
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81 /* Standard includes. */
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84 /* FreeRTOS includes. */
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85 #include "FreeRTOS.h"
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88 /* Hardware specific includes. */
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89 #include "lpc11xx.h"
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91 /* Set mainCREATE_SIMPLE_BLINKY_DEMO_ONLY to one to run the simple blinky demo,
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92 or 0 to run the more comprehensive test and demo application. */
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93 #define mainCREATE_SIMPLE_BLINKY_DEMO_ONLY 0
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95 /* The bit on port 0 to which the LED is wired. */
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96 #define mainLED_BIT ( 1UL << 7UL )
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98 /* The configCHECK_FOR_STACK_OVERFLOW setting in FreeRTOSConifg can be used to
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99 check task stacks for overflows. It does not however check the stack used by
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100 interrupts. This demo has a simple addition that will also check the stack used
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101 by interrupts if mainCHECK_INTERRUPT_STACK is set to 1. Note that this check is
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102 only performed from the tick hook function (which runs in an interrupt context).
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103 It is a good debugging aid - but won't catch interrupt stack problems until the
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104 tick interrupt next executes. */
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105 #define mainCHECK_INTERRUPT_STACK 1
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106 #if mainCHECK_INTERRUPT_STACK == 1
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107 const unsigned char ucExpectedInterruptStackValues[] = { 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC };
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110 /*-----------------------------------------------------------*/
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113 * Perform any application specific hardware configuration. The clocks,
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114 * memory, etc. are configured before main() is called.
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116 static void prvSetupHardware( void );
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119 * The hardware only has a single LED. Simply toggle it.
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121 void vMainToggleLED( void );
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123 /* main_blinky() is used when mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 1.
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124 main_full() is used when mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 0. */
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125 void main_blinky( void );
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126 void main_full( void );
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128 /*-----------------------------------------------------------*/
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130 /* The GPIO port to which the LED is attached. */
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131 static LPC_GPIO_TypeDef * const xGPIO0 = LPC_GPIO0;
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133 /*-----------------------------------------------------------*/
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136 /* Prepare the hardware to run this demo. */
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137 prvSetupHardware();
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139 /* The mainCREATE_SIMPLE_BLINKY_DEMO_ONLY setting is described at the top
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141 #if mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 1
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153 /*-----------------------------------------------------------*/
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155 void vMainToggleLED( void )
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157 static unsigned long ulLEDState = 0UL;
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159 if( ulLEDState == 0UL )
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161 xGPIO0->MASKED_ACCESS[ mainLED_BIT ] = 0UL;
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165 xGPIO0->MASKED_ACCESS[ mainLED_BIT ] = mainLED_BIT;
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168 ulLEDState = !ulLEDState;
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170 /*-----------------------------------------------------------*/
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172 static void prvSetupHardware( void )
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174 extern unsigned long _vStackTop[], _pvHeapStart[];
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175 unsigned long ulInterruptStackSize;
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177 /* Enable AHB clock for GPIO. */
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178 LPC_SYSCON->SYSAHBCLKCTRL |= ( 1 << 6 );
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180 /* Configure GPIO for LED output. */
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181 xGPIO0->DIR |= mainLED_BIT;
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183 /* The size of the stack used by main and interrupts is not defined in
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184 the linker, but just uses whatever RAM is left. Calculate the amount of
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185 RAM available for the main/interrupt/system stack, and check it against
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186 a reasonable number. If this assert is hit then it is likely you don't
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187 have enough stack to start the kernel, or to allow interrupts to nest.
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188 Note - this is separate to the stacks that are used by tasks. The stacks
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189 that are used by tasks are automatically checked if
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190 configCHECK_FOR_STACK_OVERFLOW is not 0 in FreeRTOSConfig.h - but the stack
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191 used by interrupts is not. Reducing the conifgTOTAL_HEAP_SIZE setting will
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192 increase the stack available to main() and interrupts. */
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193 ulInterruptStackSize = ( ( unsigned long ) _vStackTop ) - ( ( unsigned long ) _pvHeapStart );
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194 configASSERT( ulInterruptStackSize > 350UL );
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196 /* Fill the stack used by main() and interrupts to a known value, so its
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197 use can be manually checked. */
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198 memcpy( ( void * ) _pvHeapStart, ucExpectedInterruptStackValues, sizeof( ucExpectedInterruptStackValues ) );
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200 /*-----------------------------------------------------------*/
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202 void vApplicationMallocFailedHook( void )
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204 /* vApplicationMallocFailedHook() will only be called if
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205 configUSE_MALLOC_FAILED_HOOK is set to 1 in FreeRTOSConfig.h. It is a hook
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206 function that will get called if a call to pvPortMalloc() fails.
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207 pvPortMalloc() is called internally by the kernel whenever a task, queue,
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208 timer or semaphore is created. It is also called by various parts of the
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209 demo application. If heap_1.c or heap_2.c are used, then the size of the
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210 heap available to pvPortMalloc() is defined by configTOTAL_HEAP_SIZE in
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211 FreeRTOSConfig.h, and the xPortGetFreeHeapSize() API function can be used
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212 to query the size of free heap space that remains (although it does not
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213 provide information on how the remaining heap might be fragmented). */
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214 taskDISABLE_INTERRUPTS();
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217 /*-----------------------------------------------------------*/
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219 void vApplicationIdleHook( void )
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221 /* vApplicationIdleHook() will only be called if configUSE_IDLE_HOOK is set
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222 to 1 in FreeRTOSConfig.h. It will be called on each iteration of the idle
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223 task. It is essential that code added to this hook function never attempts
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224 to block in any way (for example, call xQueueReceive() with a block time
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225 specified, or call vTaskDelay()). If the application makes use of the
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226 vTaskDelete() API function (as this demo application does) then it is also
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227 important that vApplicationIdleHook() is permitted to return to its calling
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228 function, because it is the responsibility of the idle task to clean up
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229 memory allocated by the kernel to any task that has since been deleted. */
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231 /*-----------------------------------------------------------*/
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233 void vApplicationStackOverflowHook( xTaskHandle pxTask, signed char *pcTaskName )
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235 ( void ) pcTaskName;
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238 /* Run time stack overflow checking is performed if
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239 configCHECK_FOR_STACK_OVERFLOW is defined to 1 or 2. This hook
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240 function is called if a stack overflow is detected. */
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241 taskDISABLE_INTERRUPTS();
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244 /*-----------------------------------------------------------*/
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246 void vApplicationTickHook( void )
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248 #if mainCHECK_INTERRUPT_STACK == 1
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249 extern unsigned long _pvHeapStart[];
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251 /* This function will be called by each tick interrupt if
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252 configUSE_TICK_HOOK is set to 1 in FreeRTOSConfig.h. User code can be
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253 added here, but the tick hook is called from an interrupt context, so
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254 code must not attempt to block, and only the interrupt safe FreeRTOS API
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255 functions can be used (those that end in FromISR()). */
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257 /* Manually check the last few bytes of the interrupt stack to check they
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258 have not been overwritten. Note - the task stacks are automatically
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259 checked for overflow if configCHECK_FOR_STACK_OVERFLOW is set to 1 or 2
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260 in FreeRTOSConifg.h, but the interrupt stack is not. */
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261 configASSERT( memcmp( ( void * ) _pvHeapStart, ucExpectedInterruptStackValues, sizeof( ucExpectedInterruptStackValues ) ) == 0U );
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262 #endif /* mainCHECK_INTERRUPT_STACK */
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264 /*-----------------------------------------------------------*/
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266 #ifdef JUST_AN_EXAMPLE_ISR
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268 void Dummy_IRQHandler(void)
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270 long lHigherPriorityTaskWoken = pdFALSE;
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272 /* Clear the interrupt if necessary. */
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273 Dummy_ClearITPendingBit();
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275 /* This interrupt does nothing more than demonstrate how to synchronise a
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276 task with an interrupt. A semaphore is used for this purpose. Note
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277 lHigherPriorityTaskWoken is initialised to zero. Only FreeRTOS API functions
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278 that end in "FromISR" can be called from an ISR. */
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279 xSemaphoreGiveFromISR( xTestSemaphore, &lHigherPriorityTaskWoken );
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281 /* If there was a task that was blocked on the semaphore, and giving the
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282 semaphore caused the task to unblock, and the unblocked task has a priority
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283 higher than the current Running state task (the task that this interrupt
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284 interrupted), then lHigherPriorityTaskWoken will have been set to pdTRUE
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285 internally within xSemaphoreGiveFromISR(). Passing pdTRUE into the
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286 portEND_SWITCHING_ISR() macro will result in a context switch being pended to
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287 ensure this interrupt returns directly to the unblocked, higher priority,
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288 task. Passing pdFALSE into portEND_SWITCHING_ISR() has no effect. */
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289 portEND_SWITCHING_ISR( lHigherPriorityTaskWoken );
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292 #endif /* JUST_AN_EXAMPLE_ISR */
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