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- /* 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/>.
- */
-
- #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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