abdf6f8c6b
Now the necessary settings are in adc.h. Refactored to allow repeated ADC reads without reinitialization. Arduino allows setting analogReference, this is now also implemented. ADC is now initialized to sane values in apps/arduino/arduino-process.c dev/arduino/arduino-compat.h now has all hardware independent settings for arduino (some moved from platform/osd-merkur/dev/hw-arduino.h). turnOffPWM re-implemented with hw_timer, removed from wiring_digital.c ADC-specific arduino stuff moved to arduino-compat.h Arduinos wiring_analog no longer necessary. arduino-sketch example now reads analog inputs 1 and 5 using analogRead.
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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