/*
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 ____  _    _  _____            ____   ____ _______ 
|  _ \| |  | |/ ____|          |  _ \ / __ \__   __|
| |_) | |  | | |  __   ______  | |_) | |  | | | | |  
|  _ <| |  | | | |_ | |______| |  _ <| |  | | | | |  
| |_) | |__| | |__| |          | |_) | |__| | | | |  
|____/ \____/ \_____|          |____/ \____/  |_| |  
                                                  | 
                                                \ | /
                HOGESCHOOL VAN AMSTERDAM        -(+)-
                                                / 0 \

Functie: uitleg adc 
                          
		           
auteur: Bob Ram	                                   

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*/






/*

Project: Robert de Rare Ruige Razendsnelle Race Robot
Functie: ADC read Standaard
Mic: AtMega32


Maker: Bob Ran
Datum: 26-4-2006

*/


#define F_CPU 8000000UL  // 8 MHz

#include <avr/delay.h>

#define ADC_PRE16			ADCSRA |= 0x04; ADCSRA &= ~0x03		// prescaler 16 = 125kHz; configuration in ADCSRA = xxxx x100
#define ADC_INT_EN			ADCSRA |= 0x08						// Interrupts
#define ADC_INT_DIS			ADCSRA &= ~0x08
#define ADC_EN				ADCSRA |= 0x80						// Enable/Disable ADC
#define ADC_DIS				ADCSRA &= ~0x80
#define ADC_CONVERT			ADCSRA |= 0x40						// Convert command
#define ADC_BUSY			ADCSRA & 0x40

#define  nop()   __asm__ __volatile__ ("nop" ::)

void InitADC(void) {
//	ADCSRA = 0x84;			
	ADC_EN;
	ADC_PRE16;
}


unsigned int ADCRead(unsigned char channel) 
{
 	unsigned int adcval;
 	
	ADMUX = channel;					// MAYBE 20/3 cause 1 iteration per 3 clock cylces
	_delay_loop_1(7);					//__delay_cycles(20);	// settling time mux > adc 

	ADC_CONVERT;
	while(ADC_BUSY) nop();				//__no_operation();
    
    _delay_loop_1(7);					//__delay_cycles(20);	// settling time mux > adc

	

	//USART_Transmit(channel);			// channel nummer
	//USART_Transmit(ADCL);					// data H
	//USART_Transmit(ADCH);					// data L

	
	adcval=ADCL;
	adcval+=(ADCH<<8);
    return adcval;
}
















/*unsigned char adcval_high;
unsigned char adcval_low;


void ADC_Init(void)								// initialiseer A/D converter
{
  ADMUX = 0x40;					  				// Select channel 1

  ADCSRA = 0xEF;								// A/D enable, Start conversion, inerrupt enable, division factor 128
}


SIGNAL(SIG_ADC)
{  
  adcval_low = ADCL;							// Zet de waarde uit het ADC low register in char adcval_low
  adcval_high = ADCH;							// Zet de waarde uit het ADC high register in char adcval_high

  
  ADCSRA = ADCSRA | 0x40;						// Trigger de ADC again
}*/