portmacro.h

FreeRTOS - V5.1.1 Last Update: Nov 20 2008 http://sourceforge.net/projects/freertos/

/*
	FreeRTOS.org V5.1.1 - Copyright (C) 2003-2008 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.

    ***************************************************************************
    ***************************************************************************
    *                                                                         *
    * SAVE TIME AND MONEY!  We can port FreeRTOS.org to your own hardware,    *
    * and even write all or part of your application on your behalf.          *
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    * expedite your project.                                                  *
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    ***************************************************************************
    ***************************************************************************

	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.

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	licensing and training services.
*/


#ifndef PORTMACRO_H
#define PORTMACRO_H

#ifdef __cplusplus
extern "C" {
#endif

/*-----------------------------------------------------------
 * Port specific definitions.  
 *
 * The settings in this file configure FreeRTOS correctly for the
 * given hardware and compiler.
 *
 * These settings should not be altered.
 *-----------------------------------------------------------
 */

/* Type definitions. */
#define portCHAR		char
#define portFLOAT		float
#define portDOUBLE		double
#define portLONG		long
#define portSHORT		short
#define portSTACK_TYPE	unsigned portCHAR
#define portBASE_TYPE	char

#if( configUSE_16_BIT_TICKS == 1 )
	typedef unsigned portSHORT portTickType;
	#define portMAX_DELAY ( portTickType ) 0xffff
#else
	typedef unsigned portLONG portTickType;
	#define portMAX_DELAY ( portTickType ) 0xffffffff
#endif
/*-----------------------------------------------------------*/

/* Hardware specifics. */
#define portBYTE_ALIGNMENT			2
#define portSTACK_GROWTH			( -1 )
#define portTICK_RATE_MS			( ( portTickType ) 1000 / configTICK_RATE_HZ )		
#define portYIELD()					asm volatile( "TRAPA #0" )
#define portNOP()					asm volatile( "NOP" )
/*-----------------------------------------------------------*/

/* Critical section handling. */
#define portENABLE_INTERRUPTS()		asm volatile( "ANDC	#0x7F, CCR" );
#define portDISABLE_INTERRUPTS()	asm volatile( "ORC  #0x80, CCR" );

/* Push the CCR then disable interrupts. */
#define portENTER_CRITICAL()  		asm volatile( "STC	CCR, @-ER7" ); \
                               		portDISABLE_INTERRUPTS();

/* Pop the CCR to set the interrupt masking back to its previous state. */
#define  portEXIT_CRITICAL()    	asm volatile( "LDC  @ER7+, CCR" );
/*-----------------------------------------------------------*/

/* Task utilities. */

/* Context switch macros.  These macros are very simple as the context 
is saved simply by selecting the saveall attribute of the context switch 
interrupt service routines.  These macros save and restore the stack
pointer to the TCB. */

#define portSAVE_STACK_POINTER()								\
extern void* pxCurrentTCB;										\
																\
	asm volatile(												\
					"MOV.L	@_pxCurrentTCB, ER5			\n\t" 	\
					"MOV.L	ER7, @ER5					\n\t"	\
				);												\
	( void ) pxCurrentTCB;


#define	portRESTORE_STACK_POINTER()								\
extern void* pxCurrentTCB;										\
																\
	asm volatile(												\
					"MOV.L	@_pxCurrentTCB, ER5			\n\t"	\
					"MOV.L	@ER5, ER7					\n\t"	\
				);												\
	( void ) pxCurrentTCB;

/*-----------------------------------------------------------*/

/* Macros to allow a context switch from within an application ISR. */

#define portENTER_SWITCHING_ISR() portSAVE_STACK_POINTER(); {

#define portEXIT_SWITCHING_ISR( x )							\
	if( x )													\
	{														\
		extern void vTaskSwitchContext( void );				\
		vTaskSwitchContext();								\
	}														\
	} portRESTORE_STACK_POINTER();
/*-----------------------------------------------------------*/

/* Task function macros as described on the FreeRTOS.org WEB site. */
#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
#define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )

#ifdef __cplusplus
}
#endif

#endif /* PORTMACRO_H */