53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/* Copyright 2015 Jack Humbert
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _analog_h_included__
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#define _analog_h_included__
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#include <stdint.h>
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void analogReference(uint8_t mode);
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int16_t analogRead(uint8_t pin);
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int16_t adc_read(uint8_t mux);
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#define ADC_REF_POWER (1 << REFS0)
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#define ADC_REF_INTERNAL ((1 << REFS1) | (1 << REFS0))
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#define ADC_REF_EXTERNAL (0)
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// These prescaler values are for high speed mode, ADHSM = 1
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#if F_CPU == 16000000L
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# define ADC_PRESCALER ((1 << ADPS2) | (1 << ADPS1))
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#elif F_CPU == 8000000L
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# define ADC_PRESCALER ((1 << ADPS2) | (1 << ADPS0))
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#elif F_CPU == 4000000L
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# define ADC_PRESCALER ((1 << ADPS2))
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#elif F_CPU == 2000000L
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# define ADC_PRESCALER ((1 << ADPS1) | (1 << ADPS0))
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#elif F_CPU == 1000000L
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# define ADC_PRESCALER ((1 << ADPS1))
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#else
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# define ADC_PRESCALER ((1 << ADPS0))
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#endif
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// some avr-libc versions do not properly define ADHSM
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#if defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
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# if !defined(ADHSM)
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# define ADHSM (7)
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# endif
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#endif
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#endif
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