84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
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* Copyright (c) 2012, BinaryLabs.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: adc.c,v 1.1 2010/08/25 19:34:06 nifi Exp $
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*/
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/**
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* \file
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* ADC file for Atmega128rfa1.
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* \author
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* Paulo Louro <paulolouro@binarylabs.dk>
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*/
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#include "adc.h"
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static uint8_t analog_reference = ADC_DEFAULT;
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/*
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* For arduino interface for setting external reference voltage
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* Note that applying an external voltage *and* then setting the analog
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* reference to something internal will short the internal and the
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* external reference voltage and most likely destroy the processor.
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*/
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void analogReference(uint8_t mode)
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{
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analog_reference = mode;
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}
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int readADC(uint8_t pin)
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{
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int result = 0;
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adc_setup (analog_reference, pin);
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result = adc_read ();
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adc_fin ();
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return result;
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}
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/**
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* \return Internal temperature in 0.01C, e.g. 25C is 2500
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*/
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int readInternalTemp(void)
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{
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int reading = 0;
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ADCSRB |= _BV(MUX5);
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ADMUX = _BV(REFS1) | _BV(REFS0) | 0b1001 ;
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ADCSRA = _BV(ADEN) | _BV(ADPS0) | _BV(ADPS2) ;
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ADCSRA |= 1 << ADSC;
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loop_until_bit_is_clear(ADCSRA,ADSC);
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reading = ADC;
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ADCSRB=0; //disable ADC, need to write B first for MUX5 bit
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ADCSRA=0; //disable ADC
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ADMUX=0; //turn off internal vref
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return reading * 113 - 27280;
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}
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