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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
#ifdef BATTCHECK_4bars
PROGMEM const uint8_t voltage_blinks[] = {
// 0 blinks for less than 1%
ADC_0p, // 1 blink for 1%-25%
ADC_25p, // 2 blinks for 25%-50%
ADC_50p, // 3 blinks for 50%-75%
ADC_75p, // 4 blinks for 75%-100%
ADC_100p, // 5 blinks for >100%
255, // Ceiling, don't remove (6 blinks means "error")
};
#endif // BATTCHECK_4bars
#ifdef BATTCHECK_8bars
PROGMEM const uint8_t voltage_blinks[] = {
// 0 blinks for less than 1%
ADC_30, // 1 blink for 1%-12.5%
ADC_33, // 2 blinks for 12.5%-25%
ADC_35, // 3 blinks for 25%-37.5%
ADC_37, // 4 blinks for 37.5%-50%
ADC_38, // 5 blinks for 50%-62.5%
ADC_39, // 6 blinks for 62.5%-75%
ADC_40, // 7 blinks for 75%-87.5%
ADC_41, // 8 blinks for 87.5%-100%
ADC_42, // 9 blinks for >100%
255, // Ceiling, don't remove (10 blinks means "error")
};
#endif // BATTCHECK_8bars
#ifdef BATTCHECK_VpT
/*
PROGMEM const uint8_t v_whole_blinks[] = {
// 0 blinks for (shouldn't happen)
0, // 1 blink for (shouldn't happen)
ADC_20, // 2 blinks for 2V
ADC_30, // 3 blinks for 3V
ADC_40, // 4 blinks for 4V
255, // Ceiling, don't remove
};
PROGMEM const uint8_t v_tenth_blinks[] = {
// 0 blinks for less than 1%
ADC_30,
ADC_33,
ADC_35,
ADC_37,
ADC_38,
ADC_39,
ADC_40,
ADC_41,
ADC_42,
255, // Ceiling, don't remove
};
*/
PROGMEM const uint8_t voltage_blinks[] = {
// 0 blinks for (shouldn't happen)
ADC_25,(2<<5)+5,
ADC_26,(2<<5)+6,
ADC_27,(2<<5)+7,
ADC_28,(2<<5)+8,
ADC_29,(2<<5)+9,
ADC_30,(3<<5)+0,
ADC_31,(3<<5)+1,
ADC_32,(3<<5)+2,
ADC_33,(3<<5)+3,
ADC_34,(3<<5)+4,
ADC_35,(3<<5)+5,
ADC_36,(3<<5)+6,
ADC_37,(3<<5)+7,
ADC_38,(3<<5)+8,
ADC_39,(3<<5)+9,
ADC_40,(4<<5)+0,
ADC_41,(4<<5)+1,
ADC_42,(4<<5)+2,
ADC_43,(4<<5)+3,
ADC_44,(4<<5)+4,
255, (1<<5)+1, // Ceiling, don't remove
};
inline uint8_t battcheck() {
// Return an composite int, number of "blinks", for approximate battery charge
// Uses the table above for return values
// Return value is 3 bits of whole volts and 5 bits of tenths-of-a-volt
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 += 2) {}
return pgm_read_byte(voltage_blinks + i + 1);
}
#else // #ifdef BATTCHECK_VpT
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 // BATTCHECK_VpT
#endif
#endif // TK_VOLTAGE_H
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