Power improvements (#114)

Boards/LilygoTdeck/Source/hal/TdeckPower.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "hal/Power.h"
+#include <esp_adc/adc_oneshot.h>
+#include <memory>
+
+using namespace tt::hal;
+
+class TdeckPower : public Power {
+
+    adc_oneshot_unit_handle_t adcHandle = nullptr;
+
+public:
+
+    TdeckPower();
+    ~TdeckPower();
+
+    bool supportsMetric(MetricType type) const override;
+    bool getMetric(Power::MetricType type, Power::MetricData& data) override;
+
+private:
+
+    bool readBatteryVoltageSampled(uint32_t& output);
+    bool readBatteryVoltageOnce(uint32_t& output);
+};
+
+std::shared_ptr<Power> tdeck_get_power();