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#ifndef TK_VOLTAGE_H
#define TK_VOLTAGE_H
/*
* Voltage / battcheck functions.
*
* Copyright (C) 2015 Selene ToyKeeper
*
* 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 3 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/>.
*
*/
#include "tk-attiny.h"
#include "tk-calibration.h"
#ifdef VOLTAGE_MON
inline void ADC_on() {
// disable digital input on ADC pin to reduce power consumption
DIDR0 |= (1 << ADC_DIDR);
// 1.1v reference, left-adjust, ADC1/PB2
ADMUX = (1 << V_REF) | (1 << ADLAR) | ADC_CHANNEL;
// enable, start, prescale
ADCSRA = (1 << ADEN ) | (1 << ADSC ) | ADC_PRSCL;
}
uint8_t get_voltage() {
// Start conversion
ADCSRA |= (1 << ADSC);
// Wait for completion
while (ADCSRA & (1 << ADSC));
// Send back the result
return ADCH;
}
#else
inline void ADC_off() {
ADCSRA &= ~(1<<7); //ADC off
}
#endif
#ifdef USE_BATTCHECK
PROGMEM const uint8_t voltage_blinks[] = {
// 0 blinks for less than 1%
ADC_0, // 1 blink for 1%-25%
ADC_25, // 2 blinks for 25%-50%
ADC_50, // 3 blinks for 50%-75%
ADC_75, // 4 blinks for 75%-100%
ADC_100, // 5 blinks for >100%
255, // Ceiling, don't remove (6 blinks means "error")
};
inline uint8_t battcheck() {
// Return an int, number of "blinks", for approximate battery charge
// Uses the table above for return values
uint8_t i, voltage;
voltage = get_voltage();
// figure out how many times to blink
for (i=0;
voltage > pgm_read_byte(voltage_blinks + i);
i ++) {}
return i;
}
#endif
#endif // TK_VOLTAGE_H
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