Refactor light sensor

AdaptiveBrightnessFirmware/Inc/light_sensors.hpp

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <array>
+#include <cstdint>
+#include <utility>
+
+#include "adc.h"
+#include "utils.hpp"
+
+class LightSensors {
+  public:
+    static inline const std::array<uint16_t, 3>& getValues()
+    {
+        sampleLightSensors();
+        return m_adcValues;
+    }
+
+    template<size_t Idx>
+    static inline const int16_t& getValue()
+    {
+        static_assert(Idx < m_adcValues.size(), "Invalid light sensor index");
+
+        sampleLightSensors();
+        return m_adcValues[Idx];
+    }
+
+  private:
+    static std::array<uint16_t, 3> m_adcValues;
+
+    static void sampleLightSensors()
+    {
+        HAL_ADC_Start(&hadc);
+
+        util::for_constexpr(
+            [](const auto& idx) {
+                constexpr auto i = idx.value;
+                HAL_ADC_PollForConversion(&hadc, HAL_MAX_DELAY);
+                m_adcValues[i] = HAL_ADC_GetValue(&hadc);
+            },
+            std::make_index_sequence<m_adcValues.size()>{});
+
+        HAL_ADC_Stop(&hadc);
+    }
+};