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Hypnos.cpp
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Hypnos.cpp
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#include "Hypnos.h"
struct SleepData defSleepData = {0, 0, 0.0};
Hypnos::Hypnos(uint16_t batteryMAh) {
_sleepData = &defSleepData;
_init(batteryMAh, DEFAULT_MIN_DELAY, DEFAULT_MAX_DELAY);
}
Hypnos::Hypnos(uint16_t batteryMAh, SleepData* sleepData) {
_sleepData = sleepData;
_init(batteryMAh, DEFAULT_MIN_DELAY, DEFAULT_MAX_DELAY);
}
Hypnos::Hypnos(uint16_t batteryMAh, uint32_t minDelayMillis, uint32_t maxDelayMillis) {
_sleepData = &defSleepData;
_init(batteryMAh, minDelayMillis, maxDelayMillis);
}
Hypnos::Hypnos(uint16_t batteryMAh, uint32_t minDelayMillis, uint32_t maxDelayMillis, SleepData* sleepData) {
_sleepData = sleepData;
_init(batteryMAh, minDelayMillis, maxDelayMillis);
}
void Hypnos::init() {
Wire.begin();
if (_sleepData->sleepCycleCounter > 0) {
_putToSleepIfDischarging();
}
}
void Hypnos::setDelayFunction(void (*delayFunction)(uint32_t)) {
_delayFunction = delayFunction;
}
void Hypnos::setMinDelayMillis(uint32_t minDelayMillis) {
_min = minDelayMillis;
}
void Hypnos::setMaxDelayMillis(uint32_t maxDelayMillis) {
_max = maxDelayMillis;
}
void Hypnos::setSlope(float slope) {
_slope = slope;
}
void Hypnos::setDisplacement(double displacement) {
_displacement = displacement;
}
uint32_t Hypnos::getConsumptionTicks() {
return _getTicksFromCounter();
}
float Hypnos::getRemainingCapacity() {
return (float) (_batteryMAh - (_getTicksFromCounter() * MAH_PER_TICK));
}
float Hypnos::getRemainingPercentage() {
return getRemainingCapacity() / _batteryMAh;
}
uint32_t Hypnos::previewSleepTime() {
// Scale FROM -5 to 5
float scaledBatteryLevel = getRemainingPercentage() * 10 - 5;
// Biased sigmoid function that handicaps low battery levels
float timelinePosition = (float) (1.0f / (1.0f + _displacement * exp(_slope * scaledBatteryLevel)));
// Calculate delay time based on given parameters
return (uint32_t) ((_max - _min) * timelinePosition + _min);
}
void Hypnos::sleep() {
uint32_t sleepTime = previewSleepTime();
uint32_t threshold = (uint32_t) ((_max - _min) * UPPER_SLEEP_LIMIT + _min);
if (sleepTime < threshold) {
_delayFunction(sleepTime);
} else {
_sleepData->sleepCycleCounter++;
_sleepData->batteryBeforeSleep = getRemainingPercentage();
sleepTime = _calculateSleepTimeOverThreshold((uint32_t) (log10(10 * _sleepData->sleepCycleCounter) * threshold));
_delayFunction(sleepTime);
_putToSleepIfDischarging(); // Not called if sleep function resets board
}
}
void Hypnos::_init(uint16_t batteryMAh, uint32_t minDelayMillis, uint32_t maxDelayMillis) {
_batteryMAh = batteryMAh;
_min = minDelayMillis;
_max = maxDelayMillis;
_slope = DEFAULT_SLOPE;
_displacement = DEFAULT_DISPLACEMENT;
_lastTickCheck = millis() - MAX_PERIOD;
_lastTicks = 0; // TODO Initialize from NVRAM
}
uint32_t Hypnos::_getTicksFromCounter() {
#ifdef TESTING_ENV
return Ticks.getTicks();
#else
if (millis() >= _lastTickCheck + MAX_PERIOD) {
uint8_t i = LONG_BYTES - 1;
uint32_t ticks = 0;
Wire.requestFrom(CONSUMPTION_COUNTER_ADDR, LONG_BYTES);
while (Wire.available()) {
ticks += ((uint8_t) Wire.read()) << i*BYTE;
i--;
}
_lastTickCheck = millis();
_lastTicks = ticks;
}
return _lastTicks;
#endif
}
uint32_t Hypnos::_calculateSleepTimeOverThreshold(uint32_t threshold) {
if (_sleepData->sleepCycleCounter == 1) {
_sleepData->sleepTimeStash = previewSleepTime();
}
uint32_t sleepTime = (_sleepData->sleepTimeStash < threshold) ? _sleepData->sleepTimeStash : threshold;
_sleepData->sleepTimeStash -= sleepTime;
return sleepTime;
}
void Hypnos::_putToSleepIfDischarging() {
float batteryAfterSleep = getRemainingPercentage();
if (_sleepData->batteryBeforeSleep < batteryAfterSleep
|| (_sleepData->sleepCycleCounter > 0 && _sleepData->sleepTimeStash == 0)) {
_sleepData->sleepCycleCounter = 0;
_sleepData->sleepTimeStash = 0;
} else {
sleep();
}
}