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// 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);
}
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