// Function to get voltage on analog pin on AVR
//
// Calling Sequence
//     u8AVRReadADCs(channel)
//
// Parameters
//     channel 	: Select which channel is to be read. Values from 0-7 select one 
//	             of the pins ADC0-ADC7. For other possible channel values refer
//               datasheet
//   Returns->  
//     result 	: Digital value for the voltage present on channel selected
//
// Description
//     This function returns digital value for present on adc pins. 'channel' 
//     selects which of the ADC0-ADC7 is to be used for reading analog value.
//     Apart from reading just ADC0-ADC7 other it can also read differential 
//     voltages between some pins. For channel values for those options, please 
//     refer datasheet.      
//
// Examples
//     adc_result = u8AVRReadADC(0)   //Read ADC0
//
// Authors
//     Siddhesh Wani
//


#include "AVRPeripheralADC.h"

uint16 u8AVRReadADCs(uint8 channel)
{
	/*Set ADC conversion channel*/
    ADMUX |= (channel & 0x1F);

	/*Start ADC conversion. Set 'ADSC' bit*/
	ADCSRA |= (1<<6);

	/*Wait for conversion to complete. Check 'ADIF' bit*/
    while(!(ADCSRA & (1<<4)));

	/*Clear ADIF flag*/
    ADCSRA |= (1<<4);

	/*ADC conversion result is stored in ADCH/L registers*/
	return (ADC);
}