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FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
All rights reserved
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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 *
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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
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* This project provides two demo applications. A low power project that
* demonstrates the FreeRTOS tickless mode, and a more comprehensive test and
* demo application. The configCREATE_LOW_POWER_DEMO setting (defined at the
* top of FreeRTOSConfig.h) is used to select between the two. The low power
* demo is implemented and described in main_low_power.c. The more
* comprehensive test and demo application is implemented and described in
* main_full.c.
* This file implements the code that is not demo specific, including the
* hardware setup and FreeRTOS hook functions.
/* Kernel includes. */
#include "FreeRTOS.h"
#include "task.h"
/* ST library functions. */
#include "stm32l1xx.h"
#include "discover_board.h"
* Set up the hardware ready to run this demo.
static void prvSetupHardware( void );
* main_low_power() is used when configCREATE_LOW_POWER_DEMO is set to 1.
* main_full() is used when configCREATE_LOW_POWER_DEMO is set to 0.
* configCREATE_LOW_POWER_DEMO is defined at the top of main.c.
extern void main_low_power( void );
extern void main_full( void );
/* Prototypes for the standard FreeRTOS callback/hook functions implemented
within this file. */
void vApplicationMallocFailedHook( void );
void vApplicationIdleHook( void );
void vApplicationStackOverflowHook( TaskHandle_t pxTask, char *pcTaskName );
void vApplicationTickHook( void );
int main( void )
/* Prepare the hardware to run this demo. */
/* The configCREATE_LOW_POWER_DEMO setting is described at the top of
this file. */
#if configCREATE_LOW_POWER_DEMO == 1
/* This line will never be reached. */
return 0;
static void prvSetupHardware( void )
/* GPIO, EXTI and NVIC Init structure declaration */
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
void SystemCoreClockUpdate( void );
/* System function that updates the SystemCoreClock variable. */
/* Essential on STM32 Cortex-M devices. */
NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 );
/* Systick is fed from HCLK/8. */
SysTick_CLKSourceConfig( SysTick_CLKSource_HCLK_Div8 );
/* Set MSI clock range to ~4.194MHz. */
RCC_MSIRangeConfig( RCC_MSIRange_6 );
/* Enable the GPIOs clocks. */
/* Enable comparator clocks. */
RCC_APB1PeriphClockCmd( RCC_APB1Periph_COMP, ENABLE );
/* Enable SYSCFG clocks. */
RCC_APB2PeriphClockCmd( RCC_APB2Periph_SYSCFG , ENABLE );
/* Set internal voltage regulator to 1.5V. */
PWR_VoltageScalingConfig( PWR_VoltageScaling_Range2 );
/* Wait Until the Voltage Regulator is ready. */
while( PWR_GetFlagStatus( PWR_FLAG_VOS ) != RESET );
/* Configure User Button pin as input */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
/* Select User Button pin as input source for EXTI Line */
SYSCFG_EXTILineConfig( EXTI_PortSourceGPIOA, EXTI_PinSource0 );
/* Configure EXT1 Line 0 in interrupt mode trigged on Rising edge */
EXTI_InitStructure.EXTI_Line = EXTI_Line0 ; /* PA0 for User button AND IDD_WakeUP */
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init( &EXTI_InitStructure );
/* Enable and set EXTI0 Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_LOWEST_INTERRUPT_PRIORITY;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &NVIC_InitStructure );
/* Configure the LED_pin as output push-pull for LD3 & LD4 usage */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init( LD_GPIO_PORT, &GPIO_InitStructure );
/* Force a low level on LEDs */
void vApplicationMallocFailedHook( void )
/* vApplicationMallocFailedHook() will only be called if
configUSE_MALLOC_FAILED_HOOK is set to 1 in FreeRTOSConfig.h. It is a hook
function that will get called if a call to pvPortMalloc() fails.
pvPortMalloc() is called internally by the kernel whenever a task, queue,
timer or semaphore is created. It is also called by various parts of the
demo application. If heap_1.c or heap_2.c are used, then the size of the
heap available to pvPortMalloc() is defined by configTOTAL_HEAP_SIZE in
FreeRTOSConfig.h, and the xPortGetFreeHeapSize() API function can be used
to query the size of free heap space that remains (although it does not
provide information on how the remaining heap might be fragmented). */
for( ;; );
void vApplicationIdleHook( void )
/* vApplicationIdleHook() will only be called if configUSE_IDLE_HOOK is set
to 1 in FreeRTOSConfig.h. It will be called on each iteration of the idle
task. It is essential that code added to this hook function never attempts
to block in any way (for example, call xQueueReceive() with a block time
specified, or call vTaskDelay()). If the application makes use of the
vTaskDelete() API function (as this demo application does) then it is also
important that vApplicationIdleHook() is permitted to return to its calling
function, because it is the responsibility of the idle task to clean up
memory allocated by the kernel to any task that has since been deleted. */
void vApplicationStackOverflowHook( TaskHandle_t pxTask, char *pcTaskName )
( void ) pcTaskName;
( void ) pxTask;
/* Run time stack overflow checking is performed if
configCHECK_FOR_STACK_OVERFLOW is defined to 1 or 2. This hook
function is called if a stack overflow is detected. */
for( ;; );
void vApplicationTickHook( void )
/* This function will be called by each tick interrupt if
configUSE_TICK_HOOK is set to 1 in FreeRTOSConfig.h. User code can be
added here, but the tick hook is called from an interrupt context, so
code must not attempt to block, and only the interrupt safe FreeRTOS API
functions can be used (those that end in FromISR()). */
void vAssertCalled( unsigned long ulLine, const char * const pcFileName )
volatile unsigned long ulSetToNonZeroInDebuggerToContinue = 0;
/* Parameters are not used. */
( void ) ulLine;
( void ) pcFileName;
while( ulSetToNonZeroInDebuggerToContinue == 0 )
/* Use the debugger to set ulSetToNonZeroInDebuggerToContinue to a
non zero value to step out of this function to the point that raised
this assert(). */
__asm volatile( "NOP" );
__asm volatile( "NOP" );