databus.h

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// *********************************************************************************** //
//
//	Filename		:   pca.c
//	Title        	:   TowerBuilder Databus setting
//	Author			:   Fung Tin Ching
//	Created Date	:   2007.11.27
//	Revisited Date	:   2008.01.16
//	Description		:   This file is provide function to get floorsensor data, switch and
//                      set the address to address bus
//	Version         :   1.2
//
//  Copyright (c) 2008, All rights reserved.
// *********************************************************************************** //

#ifndef _DATABUS_H
#define _DATABUS_H

#include "global.h"

volatile bit switch1=1;
volatile bit switch2=1;
volatile bit flashing_LED=1;

volatile u08 sensor_front_ledon;
volatile u08 sensor_front_ledoff;
volatile u08 sensor_back_ledon;
volatile u08 sensor_back_ledoff;
volatile u08 sensor_side;

#define READ_FLOORSENSOR_DELAY()  delay_100us()


void setAddress(unsigned char num)
{
	ADDRESSBUS&= 0xF8;
	ADDRESSBUS|= (num&0x07);
	delay_5us();
}

void updateSwitch(void)
{
    setAddress(ADDRESS_SWITCH);
	switch1=DATABUS&SW1;
	switch2=DATABUS&SW2;
    setAddress(ADDRESS_NULL);
}

void updateFloorSensor(void)
{
	FLOORSENSOR_TRG=1;
	READ_FLOORSENSOR_DELAY();

	setAddress(ADDRESS_FRONT);
	sensor_front_ledon=DATABUS;

	setAddress(ADDRESS_BACK);
	sensor_back_ledon=DATABUS;

	setAddress(ADDRESS_SIDE);
	sensor_side=DATABUS;
			
    if (flashing_LED) 
	{
		FLOORSENSOR_TRG=0;
		READ_FLOORSENSOR_DELAY();

		setAddress(ADDRESS_FRONT);
		sensor_front_ledoff=DATABUS;
	}			   

    setAddress(ADDRESS_NULL);
}

#endif