diff options
Diffstat (limited to 'drivers/avr/analog.h')
| -rw-r--r-- | drivers/avr/analog.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/avr/analog.h b/drivers/avr/analog.h new file mode 100644 index 0000000000..8d93de7dc2 --- /dev/null +++ b/drivers/avr/analog.h @@ -0,0 +1,52 @@ +/* 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 |