FreeRTOS-Kernel/FreeRTOS/Source/portable/IAR/MSP430/portext.s43

/*
    FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd.

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    ***************************************************************************
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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.

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    viewed here: http://www.freertos.org/a00114.html and also obtained by
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    ***************************************************************************
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*/
#include "FreeRTOSConfig.h"
#include "portasm.h"

	IMPORT xTaskIncrementTick
	IMPORT vTaskSwitchContext
	IMPORT vPortSetupTimerInterrupt

	EXPORT vTickISR
	EXPORT vPortYield
	EXPORT xPortStartScheduler
	
	RSEG CODE

/*
 * The RTOS tick ISR.
 *
 * If the cooperative scheduler is in use this simply increments the tick
 * count.
 *
 * If the preemptive scheduler is in use a context switch can also occur.
 */
vTickISR:
	portSAVE_CONTEXT
				
	call	#xTaskIncrementTick

	#if configUSE_PREEMPTION == 1
		call	#vTaskSwitchContext
	#endif
		
	portRESTORE_CONTEXT
/*-----------------------------------------------------------*/


/*
 * Manual context switch called by the portYIELD() macro.
 */
vPortYield:

	/* Mimic an interrupt by pushing the SR. */
	push	SR			

	/* Now the SR is stacked we can disable interrupts. */
	dint			
				
	/* Save the context of the current task. */
	portSAVE_CONTEXT			

	/* Switch to the highest priority task that is ready to run. */
	call	#vTaskSwitchContext		

	/* Restore the context of the new task. */
	portRESTORE_CONTEXT
/*-----------------------------------------------------------*/


/*
 * Start off the scheduler by initialising the RTOS tick timer, then restoring
 * the context of the first task.
 */
xPortStartScheduler:

	/* Setup the hardware to generate the tick.  Interrupts are disabled
	when this function is called. */
	call	#vPortSetupTimerInterrupt

	/* Restore the context of the first task that is going to run. */
	portRESTORE_CONTEXT
/*-----------------------------------------------------------*/
      		

	/* Install vTickISR as the timer A0 interrupt. */
	ASEG
	ORG 0xFFE0 + TIMERA0_VECTOR
	
	_vTickISR_: DC16 vTickISR
	

	END