// Copyright (C) 2017 - IIT Bombay - FOSSEE // // This file must be used under the terms of the CeCILL. // This source file is licensed as described in the file COPYING, which // you should have received as part of this distribution. The terms // are also available at // http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt // Organization: FOSSEE, IIT Bombay // Email: toolbox@scilab.in // 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 // Ashish Kamble #include "AVRPeripheralADC.h" uint8 u8AVRReadADCs(uint8 channel) { uint8 i; ADCH=0x00; i=channel&0x07; ADMUX=i|0x60; //i|0x40 for 10 bits ADCSRA|=1<<ADSC; while(ADCSRA & (1<<ADSC)); // wait for conv. to complete uint8 temp=ADCH; //unsigned int temp=ADC; for 10 bits return temp; } /*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);