mirror of
https://github.com/Keychron/qmk_firmware.git
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37 lines
923 B
C
37 lines
923 B
C
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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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