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- #ifndef _analog_h_included__
- #define _analog_h_included__
-
- #include <stdint.h>
-
- void analogReference(uint8_t mode);
- int16_t analogRead(uint8_t pin);
- int16_t adc_read(uint8_t mux);
-
- #define ADC_REF_POWER (1<<REFS0)
- #define ADC_REF_INTERNAL ((1<<REFS1) | (1<<REFS0))
- #define ADC_REF_EXTERNAL (0)
-
- // These prescaler values are for high speed mode, ADHSM = 1
- #if F_CPU == 16000000L
- #define ADC_PRESCALER ((1<<ADPS2) | (1<<ADPS1))
- #elif F_CPU == 8000000L
- #define ADC_PRESCALER ((1<<ADPS2) | (1<<ADPS0))
- #elif F_CPU == 4000000L
- #define ADC_PRESCALER ((1<<ADPS2))
- #elif F_CPU == 2000000L
- #define ADC_PRESCALER ((1<<ADPS1) | (1<<ADPS0))
- #elif F_CPU == 1000000L
- #define ADC_PRESCALER ((1<<ADPS1))
- #else
- #define ADC_PRESCALER ((1<<ADPS0))
- #endif
-
- // some avr-libc versions do not properly define ADHSM
- #if defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
- #if !defined(ADHSM)
- #define ADHSM (7)
- #endif
- #endif
-
- #endif
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