Add mgos_barometer API

include/mgos_barometer.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "mgos.h"
+#include "mgos_i2c.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum mgos_barometer_type {
+  BARO_NONE = 0,
+  BARO_MPL115
+};
+
+struct mgos_barometer;
+
+struct mgos_barometer *mgos_barometer_create_i2c(struct mgos_i2c *i2c, uint8_t i2caddr, enum mgos_barometer_type type);
+void mgos_barometer_destroy(struct mgos_barometer **sensor);
+bool mgos_barometer_has_thermometer(struct mgos_barometer *sensor);
+bool mgos_barometer_has_barometer(struct mgos_barometer *sensor);
+
+/* Read all available sensor data from the IMU */
+bool mgos_barometer_read(struct mgos_barometer *sensor);
+
+/* Return barometer data in units of Pascals */
+bool mgos_barometer_get_pressure(struct mgos_barometer *sensor, float *p);
+
+/* Return temperature data in units of Celcius */
+bool mgos_barometer_get_temperature(struct mgos_barometer *sensor, float *t);
+
+/*
+ * Initialization function for MGOS -- currently a noop.
+ */
+bool mgos_barometer_init(void);
+
+#ifdef __cplusplus
+}
+#endif