/*
    FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd.

    FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME.  PLEASE VISIT
    http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS tutorial books are available in pdf and paperback.        *
     *    Complete, revised, and edited pdf reference manuals are also       *
     *    available.                                                         *
     *                                                                       *
     *    Purchasing FreeRTOS documentation will not only help you, by       *
     *    ensuring you get running as quickly as possible and with an        *
     *    in-depth knowledge of how to use FreeRTOS, it will also help       *
     *    the FreeRTOS project to continue with its mission of providing     *
     *    professional grade, cross platform, de facto standard solutions    *
     *    for microcontrollers - completely free of charge!                  *
     *                                                                       *
     *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *
     *                                                                       *
     *    Thank you for using FreeRTOS, and thank you for your support!      *
     *                                                                       *
    ***************************************************************************


    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.  See the GNU General Public License for more
    details. You should have received a copy of the GNU General Public License
    and the FreeRTOS license exception along with FreeRTOS; if not it can be
    viewed here: http://www.freertos.org/a00114.html and also obtained by
    writing to Real Time Engineers Ltd., contact details for whom are available
    on the FreeRTOS WEB site.

    1 tab == 4 spaces!

    ***************************************************************************
     *                                                                       *
     *    Having a problem?  Start by reading the FAQ "My application does   *
     *    not run, what could be wrong?"                                     *
     *                                                                       *
     *    http://www.FreeRTOS.org/FAQHelp.html                               *
     *                                                                       *
    ***************************************************************************


    http://www.FreeRTOS.org - Documentation, books, training, latest versions,
    license and Real Time Engineers Ltd. contact details.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, and our new
    fully thread aware and reentrant UDP/IP stack.

    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
    Integrity Systems, who sell the code with commercial support,
    indemnification and middleware, under the OpenRTOS brand.

    http://www.SafeRTOS.com - 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.
*/

/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"

/* Utility functions to implement run time stats on Cortex-M CPUs.  The collected
run time data can be viewed through the CLI interface.  See the following URL for
more information on run time stats:
http://www.freertos.org/rtos-run-time-stats.html */

/* Used in the run time stats calculations. */
static uint32_t ulClocksPer10thOfAMilliSecond = 0UL;


void vMainConfigureTimerForRunTimeStats( void )
{
	/* How many clocks are there per tenth of a millisecond? */
	ulClocksPer10thOfAMilliSecond = configCPU_CLOCK_HZ / 10000UL;
}
/*-----------------------------------------------------------*/

uint32_t ulMainGetRunTimeCounterValue( void )
{
uint32_t ulSysTickCounts, ulTickCount, ulReturn;
const uint32_t ulSysTickReloadValue = ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
volatile uint32_t * const pulCurrentSysTickCount = ( ( volatile uint32_t *) 0xe000e018 );
volatile uint32_t * const pulInterruptCTRLState = ( ( volatile uint32_t *) 0xe000ed04 );
const uint32_t ulSysTickPendingBit = 0x04000000UL;

	/* NOTE: There are potentially race conditions here.  However, it is used
	anyway to keep the examples simple, and to avoid reliance on a separate
	timer peripheral. */


	/* The SysTick is a down counter.  How many clocks have passed since it was
	last reloaded? */
	ulSysTickCounts = ulSysTickReloadValue - *pulCurrentSysTickCount;

	/* How many times has it overflowed? */
	ulTickCount = xTaskGetTickCountFromISR();

	/* Is there a SysTick interrupt pending? */
	if( ( *pulInterruptCTRLState & ulSysTickPendingBit ) != 0UL )
	{
		/* There is a SysTick interrupt pending, so the SysTick has overflowed
		but the tick count not yet incremented. */
		ulTickCount++;

		/* Read the SysTick again, as the overflow might have occurred since
		it was read last. */
		ulSysTickCounts = ulSysTickReloadValue - *pulCurrentSysTickCount;
	}

	/* Convert the tick count into tenths of a millisecond.  THIS ASSUMES
	configTICK_RATE_HZ is 1000! */
	ulReturn = ( ulTickCount * 10UL ) ;

	/* Add on the number of tenths of a millisecond that have passed since the
	tick count last got updated. */
	ulReturn += ( ulSysTickCounts / ulClocksPer10thOfAMilliSecond );

	return ulReturn;
}
/*-----------------------------------------------------------*/