C++ conversion (#80)

Converted project to C++

Boards/M5stackShared/Source/m5stack_power.cpp

@@ -0,0 +1,38 @@
+#include "Hal/Power.h"
+#include "M5Unified.hpp"
+
+/**
+ * M5.Power by default doesn't have a check to see if charging is enabled.
+ * However, it's always enabled by default after boot, so we cover that here:
+ */
+static bool is_charging_enabled = true;
+
+static bool power_is_charging() {
+    return M5.Power.isCharging() == m5::Power_Class::is_charging;
+}
+
+static bool power_is_charging_enabled() {
+    return is_charging_enabled;
+}
+
+static void power_set_charging_enabled(bool enabled) {
+    is_charging_enabled = enabled; // Local shadow copy because M5 API doesn't provide a function for it
+    M5.Power.setBatteryCharge(enabled);
+}
+
+static uint8_t power_get_charge_level() {
+    uint16_t scaled = (uint16_t)M5.Power.getBatteryLevel() * 255 / 100;
+    return (uint8_t)scaled;
+}
+
+static int32_t power_get_current() {
+    return M5.Power.getBatteryCurrent();
+}
+
+extern const tt::hal::Power m5stack_power = {
+    .is_charging = &power_is_charging,
+    .is_charging_enabled = &power_is_charging_enabled,
+    .set_charging_enabled = &power_set_charging_enabled,
+    .get_charge_level = &power_get_charge_level,
+    .get_current = &power_get_current
+};