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#pragma once
#include <cstdint>
#include <drivers/include/nrfx_saadc.h>
#include <array>
#include <numeric>
namespace Pinetime {
namespace Controllers {
/** A simple circular buffer that can be used to average
out the sensor values. The total capacity of the CircBuffer
is given as the template parameter N.
*/
template <int N> class CircBuffer {
public:
CircBuffer() : arr {}, sz {}, cap {N}, head {} {
}
/**
insert member function overwrites the next data to the current
HEAD and moves the HEAD to the newly inserted value.
*/
void insert(const int num) {
head %= cap;
arr[head++] = num;
if (sz != cap) {
sz++;
}
}
int GetAverage() const {
int sum = std::accumulate(arr.begin(), arr.end(), 0);
return (sum / sz);
}
private:
std::array<int, N> arr; /**< internal array used to store the values*/
uint8_t sz; /**< The current size of the array.*/
uint8_t cap; /**< Total capacity of the CircBuffer.*/
uint8_t head; /**< The current head of the CircBuffer*/
};
class Battery {
public:
Battery();
void Init();
void Update();
int PercentRemaining() const {
return percentRemainingBuffer.GetAverage();
}
float Voltage() const {
return voltage;
}
bool IsCharging() const {
return isCharging;
}
bool IsPowerPresent() const {
return isPowerPresent;
}
private:
static Battery* instance;
nrf_saadc_value_t saadc_value;
static constexpr uint8_t percentRemainingSamples = 5;
CircBuffer<percentRemainingSamples> percentRemainingBuffer {};
static constexpr uint32_t chargingPin = 12;
static constexpr uint32_t powerPresentPin = 19;
static constexpr nrf_saadc_input_t batteryVoltageAdcInput = NRF_SAADC_INPUT_AIN7;
float voltage = 0.0f;
int percentRemaining = -1;
bool isCharging = false;
bool isPowerPresent = false;
void SaadcInit();
void SaadcEventHandler(nrfx_saadc_evt_t const* p_event);
static void adcCallbackStatic(nrfx_saadc_evt_t const* event);
bool isReading = false;
uint8_t samples = 0;
};
}
}
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