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FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
All rights reserved
* *
* FreeRTOS provides completely free yet professionally developed, *
* robust, strictly quality controlled, supported, and cross *
* platform software that has become a de facto standard. *
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* Help yourself get started quickly and support the FreeRTOS *
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This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
>>! NOTE: The modification to the GPL is included to allow you to !<<
>>! distribute a combined work that includes FreeRTOS without being !<<
>>! obliged to provide the source code for proprietary components !<<
>>! outside of the FreeRTOS kernel. !<<
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. Full license text is available from the following
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* *
* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong?" *
* *
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*************************************************************************** - Documentation, books, training, latest versions,
license and Real Time Engineers Ltd. contact details. - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool, a DOS
compatible FAT file system, and our tiny thread aware UDP/IP stack. - Real Time Engineers ltd license FreeRTOS to High
Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and middleware. - High Integrity Systems also provide a safety
engineered and independently SIL3 certified version for use in safety and
mission critical applications that require provable dependability.
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* Creates all the demo application tasks, then starts the scheduler. The WEB
* documentation provides more details of the standard demo application tasks.
* In addition to the standard demo tasks, the following tasks and tests are
* defined and/or created within this file:
* "LCD test" task - the LCD task writes a continually repeating series of patterns
* to the LCD display.
* "LED test" task - This is a very simple task that just turns on user LEDs
* 8 to 15 in turn, before turning them off again.
* "Check task" - The check task only runs every five seconds but has the highest
* priority so is guaranteed to get processing time. Its main job is to inspect
* all the other standard demo tasks to ensure they are executing without error.
* The Check task will toggle LED 0 every five seconds while no errors exist,
* with the toggle frequency increasing to 200ms should an error be detected in
* any other task.
* Both the check task and the idle task place the processor into energy saving
* mode 1, which will be exited following each tick interrupt. The check task
* is the highest priority task in the system, so while it is executing no other
* task will execute. If the check task places the processor into a low power
* mode without blocking then the energy consumption as viewed on the Energy
* Micro Gecko board will go down noticeably as in effect no tasks will be running.
* The check task places the processor into low power mode for two out of every
* five seconds. The current use of low power modes is very basic. Future
* FreeRTOS releases will aim to make significant improvements.
/* Scheduler includes. */
#include "FreeRTOS.h"
#include "croutine.h"
#include "task.h"
#include "queue.h"
#include "semphr.h"
/* Common demo application includes. */
#include "partest.h"
#include "GenQTest.h"
#include "QPeek.h"
#include "recmutex.h"
#include "semtest.h"
/* Demo application includes. */
#include "lcdcontroller.h"
#include "ledtest.h"
#include "lcdtest.h"
#include "chip.h"
/* Task priorities. */
#define mainLCD_TASK_PRIORITY ( tskIDLE_PRIORITY + 1 )
#define mainLED_TASK_PRIORITY ( tskIDLE_PRIORITY + 2 )
/* A period of two seconds, adjusted to use the tick frequency. */
#define mainTWO_SECONDS ( 2000 / portTICK_PERIOD_MS )
/* The length of the delay between each cycle of the check task when an error
has / has not been detected. */
#define mainNO_ERROR_CHECK_FREQUENCY ( 5000 / portTICK_PERIOD_MS )
#define mainERROR_CHECK_FREQUENCY ( 200 / portTICK_PERIOD_MS )
/* The LED that is toggled by the check task. The rate of the toggle indicates
whether or not an error has been found, as defined by the
mainNO_ERROR_CHECK_FREQUENCY and mainERROR_CHECK_FREQUENCY definitions above. */
#define mainCHECK_LED ( 0 )
* Configure the hardware as required by the demo.
static void prvSetupHardware( void );
* The check task as described at the top of this file.
static void prvCheckTask( void *pvParameters );
* Put the CPU into the least low power low power mode.
static void prvLowPowerMode1( void );
int main( void )
/* Perform the necessary hardware configuration. */
/* Create the task that writes various text and patterns to the LCD. */
/* Create a task that writes to LEDs 8 to 15. */
/* Create some of the standard demo tasks. These just test the port and
demonstrate how the FreeRTOS API can be used. They do not provide any
specific functionality. */
vStartGenericQueueTasks( mainGEN_Q_TASK_PRIORITY );
vStartSemaphoreTasks( mainSEMAPHORE_TASK_PRIORITY );
/* Create the check task as described at the top of this file. */
xTaskCreate( prvCheckTask, "Check", configMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY, NULL );
/* Start the scheduler. */
/* The scheduler should now be running the tasks so the following code should
never be reached. If it is reached then there was insufficient heap space
for the idle task to be created. In this case the heap size is set by
configTOTAL_HEAP_SIZE in FreeRTOSConfig.h. */
for( ;; );
void vApplicationIdleHook( void )
/* Use the idle task to place the CPU into a low power mode. Greater power
saving could be achieved by not including any demo tasks that never block. */
void vApplicationStackOverflowHook( TaskHandle_t pxTask, char *pcTaskName )
/* This function will be called if a task overflows its stack, if
configCHECK_FOR_STACK_OVERFLOW != 0. It might be that the function
parameters have been corrupted, depending on the severity of the stack
overflow. When this is the case pxCurrentTCB can be inspected in the
debugger to find the offending task. */
for( ;; );
static void prvCheckTask( void *pvParameters )
TickType_t xLastExecutionTime, xFrequency = mainNO_ERROR_CHECK_FREQUENCY;
long lCount;
/* Initialise xLastExecutionTime so the first call to vTaskDelayUntil()
works correctly. */
xLastExecutionTime = xTaskGetTickCount();
for( ;; )
/* Perform this check at a frequency that indicates whether or not an
error has been found. */
vTaskDelayUntil( &xLastExecutionTime, xFrequency );
/* Check all the other tasks are running without error. */
if( xAreGenericQueueTasksStillRunning() != pdPASS )
if( xAreQueuePeekTasksStillRunning() != pdPASS )
if( xAreRecursiveMutexTasksStillRunning() != pdPASS )
if( xAreSemaphoreTasksStillRunning() != pdPASS )
/* Toggle the LED to show that the check hook function is running.
The toggle freequency will increase if an error has been found in any
task. */
vParTestToggleLED( mainCHECK_LED );
/* Just loop around putting the processor into low power mode 1 for
a while. This is the highest priority task, and this loop does not
cause it to block, so it will remain as the running task. Each time it
runs for the next two seconds it will simply put the processor to sleep.
No other task will run so nothing else will happen. This periodic two
seconds of lower power should be viewable using the Advanced Energy
Monitor on the Energy Micro Gecko board. */
for( lCount = 0; lCount < mainTWO_SECONDS; lCount++ )
static void prvSetupHardware( void )
/* Initialise the LEDs. */
/* Configure the LCD. */
LCD_Init( LCD );
static void prvLowPowerMode1( void )
/* Clear SLEEPDEEP for EM1 */
SCB->SCR &= ~( 1 << SCB_SCR_SLEEPDEEP_Pos );
/* Power down. */