/*
	FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 Richard Barry.

	This file is part of the FreeRTOS.org distribution.

	FreeRTOS.org is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	FreeRTOS.org 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
	along with FreeRTOS.org; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

	A special exception to the GPL can be applied should you wish to distribute
	a combined work that includes FreeRTOS.org, without being obliged to provide
	the source code for any proprietary components.  See the licensing section
	of http://www.FreeRTOS.org for full details of how and when the exception
	can be applied.

    ***************************************************************************
    ***************************************************************************
    *                                                                         *
    * Get the FreeRTOS eBook!  See http://www.FreeRTOS.org/Documentation      *
	*                                                                         *
	* This is a concise, step by step, 'hands on' guide that describes both   *
	* general multitasking concepts and FreeRTOS specifics. It presents and   *
	* explains numerous examples that are written using the FreeRTOS API.     *
	* Full source code for all the examples is provided in an accompanying    *
	* .zip file.                                                              *
    *                                                                         *
    ***************************************************************************
    ***************************************************************************

	Please ensure to read the configuration and relevant port sections of the
	online documentation.

	http://www.FreeRTOS.org - Documentation, latest information, license and
	contact details.

	http://www.SafeRTOS.com - A version that is certified for use in safety
	critical systems.

	http://www.OpenRTOS.com - Commercial support, development, porting,
	licensing and training services.
*/

/* Standard includes. */
#include <stdlib.h>

/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"

/* Critical nesting should be initialised to a non zero value so interrupts don't
accidentally get enabled before the scheduler is started. */
#define portINITIAL_CRITICAL_NESTING  (( portSTACK_TYPE ) 10)

/* The PSW value assigned to tasks when they start to run for the first time. */
#define portPSW		  (( portSTACK_TYPE ) 0x00000000)

/* We require the address of the pxCurrentTCB variable, but don't want to know
any details of its type. */
typedef void tskTCB;
extern volatile tskTCB * volatile pxCurrentTCB;

/* Keeps track of the nesting level of critical sections. */
volatile portSTACK_TYPE usCriticalNesting = portINITIAL_CRITICAL_NESTING;
/*-----------------------------------------------------------*/

/* Sets up the timer to generate the tick interrupt. */
static void prvSetupTimerInterrupt( void );

/*-----------------------------------------------------------*/
portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
{
	*pxTopOfStack = ( portSTACK_TYPE ) pxCode;          /* Task function start address */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) pxCode;          /* Task function start address */
	pxTopOfStack--;
	*pxTopOfStack = portPSW;                            /* Initial PSW value */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x20202020;      /* Initial Value of R20 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x21212121;      /* Initial Value of R21 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x22222222;      /* Initial Value of R22 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x23232323;      /* Initial Value of R23 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x24242424;      /* Initial Value of R24 */
	pxTopOfStack--;
#if (__DATA_MODEL__ == 0) || (__DATA_MODEL__ == 1)
	*pxTopOfStack = ( portSTACK_TYPE ) 0x25252525;      /* Initial Value of R25 */
	pxTopOfStack--;
#endif /* configDATA_MODE */
	*pxTopOfStack = ( portSTACK_TYPE ) 0x26262626;      /* Initial Value of R26 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x27272727;      /* Initial Value of R27 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x28282828;      /* Initial Value of R28 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x29292929;      /* Initial Value of R29 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x30303030;      /* Initial Value of R30 */
	pxTopOfStack--; 	
	*pxTopOfStack = ( portSTACK_TYPE ) 0x19191919;      /* Initial Value of R19 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x18181818;      /* Initial Value of R18 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x17171717;      /* Initial Value of R17 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x16161616;      /* Initial Value of R16 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x15151515;      /* Initial Value of R15 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x14141414;      /* Initial Value of R14 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x13131313;      /* Initial Value of R13 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x12121212;      /* Initial Value of R12 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x11111111;      /* Initial Value of R11 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x10101010;      /* Initial Value of R10 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x99999999;      /* Initial Value of R09 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x88888888;      /* Initial Value of R08 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x77777777;      /* Initial Value of R07 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x66666666;      /* Initial Value of R06 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) 0x55555555;      /* Initial Value of R05 */
	pxTopOfStack--;
#if __DATA_MODEL__ == 0 || __DATA_MODEL__ == 1
	*pxTopOfStack = ( portSTACK_TYPE ) 0x44444444;      /* Initial Value of R04 */
	pxTopOfStack--;
#endif /* configDATA_MODE */
	*pxTopOfStack = ( portSTACK_TYPE ) 0x22222222;      /* Initial Value of R02 */
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) pvParameters;    /* R1 is expected to hold the function parameter*/
	pxTopOfStack--;
	*pxTopOfStack = ( portSTACK_TYPE ) portNO_CRITICAL_SECTION_NESTING;	

	/*
	 * Return a pointer to the top of the stack we have generated so this can
	 * be stored in the task control block for the task.
	 */
	return pxTopOfStack;
}
/*-----------------------------------------------------------*/

portBASE_TYPE xPortStartScheduler( void )
{
	/* Setup the hardware to generate the tick.  Interrupts are disabled when
	this function is called. */
	prvSetupTimerInterrupt();

	/* Restore the context of the first task that is going to run. */
	vPortStart();

	/* Should not get here as the tasks are now running! */
	return pdTRUE;
}
/*-----------------------------------------------------------*/

void vPortEndScheduler( void )
{
	/* It is unlikely that the V850ES/Fx3 port will get stopped.  If required simply
	disable the tick interrupt here. */
}
/*-----------------------------------------------------------*/

/*
 * Hardware initialisation to generate the RTOS tick.  This uses
 */
static void prvSetupTimerInterrupt( void )
{
	TM0CE     = 0;	/* TMM0 operation disable */
	TM0EQMK0  = 1;	/* INTTM0EQ0 interrupt disable */
	TM0EQIF0  = 0;	/* clear INTTM0EQ0 interrupt flag */

	#ifdef __IAR_V850ES_Fx3__
	{
		TM0CMP0   = (((configCPU_CLOCK_HZ / configTICK_RATE_HZ) / 2)-1);    /* divided by 2 because peripherals only run at CPU_CLOCK/2 */
	}
	#else
	{
		TM0CMP0   = (configCPU_CLOCK_HZ / configTICK_RATE_HZ);	
	}
	#endif

	TM0EQIC0 &= 0xF8;
	TM0CTL0   = 0x00;
	TM0EQIF0 =  0;	/* clear INTTM0EQ0 interrupt flag */
	TM0EQMK0 =  0;	/* INTTM0EQ0 interrupt enable */
	TM0CE =     1;	/* TMM0 operation enable */
}
/*-----------------------------------------------------------*/