42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
#ifndef _ANALOG_H
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#define _ANALOG_H
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#include <stdint.h>
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#ifndef SIMULATOR
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#define REFERENCE_AREF 0
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#define REFERENCE_AVCC 64
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#if defined (__AVR_ATmega168__) || defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
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#define REFERENCE_1V1 192
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#elif defined (__AVR_ATmega_644__) || defined (__AVR_ATmega644p__)
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#define REFERENCE_1V1 128
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#define REFERENCE_2V56 192
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#endif
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/** \def REFERENCE
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Which analog reference to use. As none of the known controllers provides a
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fixed voltage on the Aref pin and all of them have a thermistor measurement
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range of 0..5 volts, let's clamp this here to the only choice, AVcc, instead
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of confusing the user with a choice.
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*/
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//#include "config_wrapper.h"
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#define REFERENCE REFERENCE_AVCC
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#ifndef REFERENCE
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#warning define REFERENCE as one of
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#if defined (__AVR_ATmega168__) || defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
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#warning REFERENCE_AREF, REFERENCE_AVCC or REFERENCE_1V1
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#elif defined (__AVR_ATmega_644__) || defined (__AVR_ATmega644p__)
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#warning REFERENCE_AREF, REFERENCE_AVCC, REFERENCE_1V1 or REFERENCE_2V56
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#endif
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#warning in your config.h
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#error REFERENCE undefined
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#endif
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#endif /* SIMULATOR */
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void analog_init(void);
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uint16_t analog_read(uint8_t index);
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#endif /* _ANALOG_H */
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