BMP280 pressure sensor driver draft implementation.

extras/bmp280/bmp280.h

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+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 sheinz (https://github.com/sheinz)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef __BMP280_H__
+#define __BMP280_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/**
+ * Uncomment to enable debug output.
+ */
+#define BMP280_DEBUG
+
+/**
+ * BMP280 address is 0x77 if SDO pin is high,
+ * Address is 0x76 if SDO pin is low.
+ */
+#define BMP280_ADDRESS  0x77
+
+/**
+ * Mode of BMP280 module operation.
+ * Forced - Measurement is initiated by user.
+ * Normal - Continues measurement.
+ */
+typedef enum {
+    BMP280_MODE_FORCED = 1,
+    BMP280_MODE_NORMAL = 3
+} BMP280_Mode;
+
+typedef enum {
+    BMP280_FILTER_OFF = 0,
+    BMP280_FILTER_2 = 1,
+    BMP280_FILTER_4 = 2,
+    BMP280_FILTER_8 = 3,
+    BMP280_FILTER_16 = 4
+} BMP280_Filter;
+
+/**
+ * Pressure oversampling settings
+ */
+typedef enum {
+    BMP280_ULTRA_LOW_POWER = 1,  /* oversampling x1 */
+    BMP280_LOW_POWER = 2,        /* oversampling x2 */
+    BMP280_STANDARD = 3,         /* oversampling x4 */
+    BMP280_HIGH_RES = 4,         /* oversampling x8 */
+    BMP280_ULTRA_HIGH_RES = 5    /* oversampling x16 */
+} BMP280_Oversampling;
+
+/**
+ * Stand by time between measurements in normal mode
+ */
+typedef enum {
+    BMP280_STANDBY_05 = 0,      /* stand by time 0.5ms */
+    BMP280_STANDBY_62 = 1,      /* stand by time 62.5ms */
+    BMP280_STANDBY_125 = 2,     /* stand by time 125ms */
+    BMP280_STANDBY_250 = 3,     /* stand by time 250ms */
+    BMP280_STANDBY_500 = 4,     /* stand by time 500ms */
+    BMP280_STANDBY_1000 = 5,    /* stand by time 1s */
+    BMP280_STANDBY_2000 = 6,    /* stand by time 2s */
+    BMP280_STANDBY_4000 = 7,    /* stand by time 4s */
+} BMP280_StandbyTime;
+
+/**
+ * Configuration parameters for BMP280 module.
+ * Use function bmp280_init_default_params to use default configuration.
+ */
+typedef struct {
+    BMP280_Mode mode;
+    BMP280_Filter filter;
+    BMP280_Oversampling oversampling;  // pressure oversampling
+    BMP280_StandbyTime standby;
+} bmp280_params_t;
+
+
+/**
+ * Initialize default parameters.
+ * Default configuration is NORMAL mode.
+ */
+void bmp280_init_default_params(bmp280_params_t *params);
+
+/**
+ * Initialize BMP280 module.
+ */
+bool bmp280_init(bmp280_params_t *params, uint8_t scl_pin, uint8_t sda_pin);
+
+/**
+ * Start measurement in forced mode.
+ * The module remains in forced mode after this call.
+ * Do not call this method in normal mode.
+ */
+bool bmp280_force_measurement();
+
+/**
+ * Read compensated temperature and pressure data.
+ */
+bool bmp280_read(float *temperature, float *pressure);
+
+#endif  // __BMP280_H__