FreeRTOS-Kernel/Demo/Flshlite/ParTest/ParTest.c

/*
    FreeRTOS V6.0.2 - Copyright (C) 2010 Real Time Engineers Ltd.

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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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*/

/*
Changes from V1.01:

	+ Types used updated.
	+ Add vParTestToggleLED();

Changes from V2.0.0

	+ Use scheduler suspends in place of critical sections.
*/


#include "FreeRTOS.h"
#include "task.h"
#include "partest.h"

#define partstALL_OUTPUTS_OFF			( ( unsigned short) 0x00 )
#define partstMAX_OUTPUT_LED			( ( unsigned char ) 7 )
#define partstPORT_F_ADDR				( ( unsigned short ) 0x605 )
#define partstPORT_DIRECTION_REG		( ( unsigned short ) 0x606 )
#define partstPORT_F_DIR_BIT			( ( unsigned short ) 0x20 )

/*lint -e956 File scope parameters okay here. */
static volatile unsigned char ucCurrentOutputValue = partstALL_OUTPUTS_OFF;
/*lint +e956 */

/*-----------------------------------------------------------
 * Simple parallel port IO routines.
 *-----------------------------------------------------------*/

void vParTestInitialise( void )
{
unsigned short usInput;

	ucCurrentOutputValue = partstALL_OUTPUTS_OFF;

	/* Set the direction to output for port F. */
	usInput = portINPUT_BYTE( partstPORT_DIRECTION_REG );
	usInput |= partstPORT_F_DIR_BIT;
	portOUTPUT_BYTE( partstPORT_DIRECTION_REG, usInput );

	/* Start with all outputs off. */
	portOUTPUT_BYTE( partstPORT_F_ADDR, partstALL_OUTPUTS_OFF );
}
/*-----------------------------------------------------------*/

void vParTestSetLED( unsigned portBASE_TYPE uxLED, portBASE_TYPE xValue )
{
unsigned char ucBit = ( unsigned char ) 1;

	if( uxLED <= partstMAX_OUTPUT_LED )
	{
		ucBit <<= uxLED;
	}	

	vTaskSuspendAll();
	{
		if( xValue == pdTRUE )
		{
			ucBit ^= ( unsigned char ) 0xff;
			ucCurrentOutputValue &= ucBit;
		}
		else
		{
			ucCurrentOutputValue |= ucBit;
		}

		portOUTPUT_BYTE( partstPORT_F_ADDR, ( unsigned ) ucCurrentOutputValue );
	}
	xTaskResumeAll();
}
/*-----------------------------------------------------------*/

void vParTestToggleLED( unsigned portBASE_TYPE uxLED )
{
unsigned char ucBit;

	if( uxLED <= partstMAX_OUTPUT_LED )
	{
		ucBit = ( ( unsigned char ) 1 ) << uxLED;

		vTaskSuspendAll();
		{
			if( ucCurrentOutputValue & ucBit )
			{
				ucCurrentOutputValue &= ~ucBit;
			}
			else
			{
				ucCurrentOutputValue |= ucBit;
			}

			portOUTPUT_BYTE( partstPORT_F_ADDR, ( unsigned ) ucCurrentOutputValue );
		}
		xTaskResumeAll();			
	}
}