/*

 * sensors.c

 *

 * Created: 11/19/2012 9:25:01 PM

 *  Author: kripperger

 */ 

#include <inttypes.h>

#include <avr/io.h>

#include <avr/interrupt.h>

#include "../config.h"

#include <util/delay.h>

#include "sensors.h"

#include "i2c.h"

void sensors_setup() 

{

	//ADC register configurations for battery level detection on PA0

	ADCSRA |= (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0);	// Set prescaler for ADC, 128 gives ADC freq of 125 KHz

	ADMUX |= (1 << REFS0);									// Set ADC reference voltage to AVCC

	//ADMUX |= 0;											// Select ADC0 as the conversion channel (default)

	ADCSRA |= (1 << ADATE);									// Enables auto trigger, determined in ADCSRB bits ADTS

	ADCSRB &= ~((1 << ADTS2) | (1 << ADTS1) | (1 << ADTS0));// Set ADC auto trigger source to free running mode

	ADCSRA |= (1 << ADEN);									// Enable ADC

	ADCSRA |= (1 << ADSC);									// Start ADC measurements.  ADC should now continuously run conversions, which are stored in ADCH 0x79	

}

int8_t	boardTemp = 255;	// Board Temperature (from i2c)

void sensors_readBoardTemp()

{

	boardTemp = i2c_read(BOARDTEMP_ADDR, 0x00);		// Read only the first byte of data (we don't need the resolution here)

	boardTemp = ((boardTemp*18)/10) + (32);			// Converting Celsius to Fahrenheit

	boardTemp = boardTemp - 3;						// Linear offset

}

int8_t sensors_getBoardTemp(void)

{

	return boardTemp;

}

uint16_t batt;		// Battery voltage (from ADC)

void sensors_readBatt()

{

	uint8_t battL = ADCL;					// Read low battery byte from ADC (all 8 bits)

	batt = ADCH;					// Read high battery byte from ADC (only two LSBs)

	batt = batt << 8;

	batt |= battL;

}

uint16_t sensors_getBatt(void)		// Gets battery voltage from variable

{

	return batt;

}

/*

 * sensors.h

 *

 * Created: 11/19/2012 9:24:50 PM

 *  Author: kripperger

 */ 

#ifndef BOARDTEMP_H_

#define BOARDTEMP_H_

void sensors_setup();

void sensors_readBoardTemp(void);	// Reads board temperature

int8_t sensors_getBoardTemp(void);	// Gets board temperature from variable

void sensors_readBatt(void);

uint16_t sensors_getBatt(void);

#endif /* BOARDTEMP_H_ */