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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 sensor values
template <int N>
class CircBuffer {
public:
CircBuffer() : arr{}, sz{}, cap{N}, loc{} {}
void insert(const float num) {
loc %= cap;
arr[loc++] = num;
if (sz != cap) {
sz++;
}
}
int GetAverage() const {
int sum = std::accumulate(arr.begin(), arr.end(), 0.0f);
return (sum / sz);
}
private:
std::array<float, N> arr;
uint8_t sz;
uint8_t cap;
uint8_t loc;
};
class Battery {
public:
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 constexpr uint32_t chargingPin = 12;
static constexpr uint32_t powerPresentPin = 19;
static constexpr nrf_saadc_input_t batteryVoltageAdcInput = NRF_SAADC_INPUT_AIN7;
static constexpr uint8_t percentRemainingSamples = 10;
static void SaadcEventHandler(nrfx_saadc_evt_t const * p_event);
CircBuffer<percentRemainingSamples> percentRemainingBuffer {};
float voltage = 0.0f;
bool isCharging = false;
bool isPowerPresent = false;
};
}
}
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