- /* Copyright 2015 Jack Humbert
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #pragma once
-
- #include <stdint.h>
- #include "quantum.h"
-
- #ifdef __cplusplus
- extern "C" {
- #endif
- void analogReference(uint8_t mode);
-
- int16_t analogReadPin(pin_t pin);
- uint8_t pinToMux(pin_t pin);
-
- int16_t adc_read(uint8_t mux);
- #ifdef __cplusplus
- }
- #endif
-
- #define ADC_REF_EXTERNAL 0 // AREF, Internal Vref turned off
- #define ADC_REF_POWER _BV(REFS0) // AVCC with external capacitor on AREF pin
- #define ADC_REF_INTERNAL (_BV(REFS1) | _BV(REFS0)) // Internal 2.56V Voltage Reference with external capacitor on AREF pin (1.1V for 328P)
-
- // These prescaler values are for high speed mode, ADHSM = 1
- #if F_CPU == 16000000L || F_CPU == 12000000L
- # define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS1)) // /64
- #elif F_CPU == 8000000L
- # define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS0)) // /32
- #elif F_CPU == 4000000L
- # define ADC_PRESCALER (_BV(ADPS2)) // /16
- #elif F_CPU == 2000000L
- # define ADC_PRESCALER (_BV(ADPS1) | _BV(ADPS0)) // /8
- #elif F_CPU == 1000000L
- # define ADC_PRESCALER _BV(ADPS1) // /4
- #else
- # define ADC_PRESCALER _BV(ADPS0) // /2
- #endif
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