Add power enabled check to power API (#68)

boards/m5stack_core2/source/power.cpp

@@ -5,11 +5,22 @@
 extern "C" {
 #endif
 
+/**
+ * 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);
 }
 
@@ -24,6 +35,7 @@ static int32_t power_get_current() {
 
 Power core2_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