Diff: BMP085.h

Revision:

0:0b4c4632aeb0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BMP085.h	Wed Dec 12 16:30:14 2012 +0000
@@ -0,0 +1,129 @@
+/*
+ * @file BMP085.h
+ * @author Tyler Weaver
+ * @author Kory Hill
+ *
+ * @section LICENSE
+ *
+ * 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.
+ *
+ * @section DESCRIPTION
+ *
+ * BMP085 I2C Temperature/Pressure/Altitude Sensor
+ *
+ * Max sample rate: 128 samples/second (temperature at 1/second)
+ *
+ * Datasheet:
+ *
+ * http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Pressure/BST-BMP085-DS000-06.pdf
+ */
+
+#ifndef BMP085_H
+#define BMP085_H
+
+#include "mbed.h"
+
+class BMP085
+{
+public:
+    /**
+     * The I2C address that can be passed directly to i2c object (it's already shifted 1 bit left).
+     */
+    static const int16_t I2C_ADDRESS = 0xEE; //address of bmp085
+
+    /**
+     * Constructor.
+     *
+     * Calls init function
+     *
+     * @param sda - mbed pin to use for the SDA I2C line.
+     * @param scl - mbed pin to use for the SCL I2C line.
+     */
+    BMP085(PinName sda, PinName scl);
+
+    /**
+    * Constructor that accepts external i2c interface object.
+    *
+    * Calls init function
+    *
+    * @param i2c The I2C interface object to use.
+    */
+    BMP085(I2C &i2c) : i2c_(i2c) {
+        init();
+    }
+    
+    ~BMP085();
+    
+    /**
+    * Sets the oss rate variables
+    * Acceptable values  = 1,2,4,8
+    *
+    *@param oss the number of over sampling
+    */
+    void set_oss(int oss);
+
+    int32_t get_temperature();
+    int32_t get_pressure();
+    double get_altitude_m();
+    double get_altitude_ft();
+    
+    /**
+    * Initialize sensor and get calibration values
+    */
+    void init();
+    
+    void display_cal_param(Serial *pc);
+
+protected:
+    
+
+private:
+
+    I2C &i2c_;
+
+    /**
+     * The raw buffer for allocating I2C object in its own without heap memory.
+     */
+    char i2cRaw[sizeof(I2C)];
+
+    // calculation variables
+    int16_t AC1, AC2, AC3, B1, B2, MB, MC, MD;
+    uint16_t  AC4, AC5, AC6;
+    
+    int32_t UT,UP; // uncompressed temperature and pressure value
+    
+    int32_t X1, X2, B5, temperature; // get_temperature variables
+    
+    int32_t B6, B3, X3, pressure; // get_pressure variables
+    uint32_t B4, B7;
+    
+    double altitude;
+    
+    // setting variables
+    char oss_bit_;
+    char oversampling_setting_;
+    float conversion_time_;
+
+    void get_cal_param(); // get calibration parameters
+    void get_ut(); // get uncompressed temperature
+    void get_up(); // get uncompressed pressure
+    void write_char(char,char);
+    int16_t read_int16(char);
+    uint16_t read_uint16(char);
+    void read_multiple(char, char*, int);
+};
+
+#endif
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