mirror of
https://github.com/Keychron/qmk_firmware.git
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a8320f20f7
* Improve support and docs for ADC driver * Comment ADC channels * Move to Makers and Modders section, and fix usage instructions * Flesh out intro * Superscript 328P note * Fix pin_to_mux LUT * Support USB64/1287 as well * analogReadPin() defaults to 0V mux on invalid pin * Update pinToMux() function documentation * Dot * Accept (some of) the `qmk cformat` changes * Do clang-format properly * More wording tweaks * Link to encoder docs
54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/* Copyright 2015 Jack Humbert
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stdint.h>
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#include "quantum.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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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 analogReadPin(pin_t pin);
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uint8_t pinToMux(pin_t pin);
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int16_t adc_read(uint8_t mux);
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#ifdef __cplusplus
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}
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#endif
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#define ADC_REF_EXTERNAL 0 // AREF, Internal Vref turned off
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#define ADC_REF_POWER _BV(REFS0) // AVCC with external capacitor on AREF pin
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#define ADC_REF_INTERNAL (_BV(REFS1) | _BV(REFS0)) // Internal 2.56V Voltage Reference with external capacitor on AREF pin (1.1V for 328P)
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// These prescaler values are for high speed mode, ADHSM = 1
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#if F_CPU == 16000000L || F_CPU == 12000000L
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# define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS1)) // /64
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#elif F_CPU == 8000000L
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# define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS0)) // /32
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#elif F_CPU == 4000000L
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# define ADC_PRESCALER (_BV(ADPS2)) // /16
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#elif F_CPU == 2000000L
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# define ADC_PRESCALER (_BV(ADPS1) | _BV(ADPS0)) // /8
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#elif F_CPU == 1000000L
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# define ADC_PRESCALER _BV(ADPS1) // /4
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#else
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# define ADC_PRESCALER _BV(ADPS0) // /2
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#endif
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