89 lines
No EOL
2.5 KiB
C
89 lines
No EOL
2.5 KiB
C
/*
|
|
* Copyright (c) 2012, BinaryLabs.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)$Id: adc.c,v 1.1 2010/08/25 19:34:06 nifi Exp $
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* ADC file for Atmega128rfa1.
|
|
* \author
|
|
* Paulo Louro <paulolouro@binarylabs.dk>
|
|
*/
|
|
|
|
#include <avr/io.h>
|
|
|
|
#ifndef cbi
|
|
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
|
|
#endif
|
|
#ifndef sbi
|
|
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
|
|
#endif
|
|
|
|
int readADC(uint8_t pin)
|
|
{
|
|
int result = 0;
|
|
|
|
if ( pin >= 14 )
|
|
pin -= 14;
|
|
|
|
ADMUX = _BV(REFS1) | _BV(REFS0) | ( pin & 7 ) ;
|
|
ADCSRA = _BV(ADEN) | _BV(ADPS0) | _BV(ADPS2) ;
|
|
sbi(ADCSRA,ADSC);
|
|
loop_until_bit_is_clear(ADCSRA,ADSC);
|
|
|
|
|
|
result = ADC;
|
|
|
|
ADCSRA=0; //disable ADC
|
|
ADMUX=0; //turn off internal vref
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* \return Internal temperature in 0.01C, e.g. 25C is 2500
|
|
*/
|
|
int readInternalTemp(void)
|
|
{
|
|
int reading = 0;
|
|
|
|
ADCSRB |= _BV(MUX5);
|
|
ADMUX = _BV(REFS1) | _BV(REFS0) | 0b1001 ;
|
|
ADCSRA = _BV(ADEN) | _BV(ADPS0) | _BV(ADPS2) ;
|
|
|
|
sbi(ADCSRA,ADSC);
|
|
loop_until_bit_is_clear(ADCSRA,ADSC);
|
|
reading = ADC;
|
|
|
|
ADCSRA=0; //disable ADC
|
|
ADCSRB=0; //disable ADC
|
|
ADMUX=0; //turn off internal vref
|
|
|
|
return reading * 113 - 27280;
|
|
} |