Diff: BMP180.h

Revision:

0:9a0671b6009f

Child:

1:072073c79cfd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BMP180.h	Sat Mar 08 21:42:40 2014 +0000
@@ -0,0 +1,154 @@
+/*
+  @file BMP180.h
+  
+  @brief Barometric Pressure and Temperature Sensor BMP180 Breakout I2C Library      
+
+  @Author spiridion (http://mailme.spiridion.net)
+
+  Tested on LPC1768 and FRDM-KL25Z
+  
+  Copyright (c) 2014 spiridion
+  Released under the MIT License (see http://mbed.org/license/mit)
+
+  Documentation regarding the BMP180 can be found here: 
+                     ...............
+*/
+
+#ifndef BMP180_H
+#define BMP180_H
+
+#include "mbed.h"
+
+///  default address is 0xEF 
+#define BMP180_I2C_ADDRESS 0xEF 
+
+// Oversampling settings
+#define BMP180_OSS_ULTRA_LOW_POWER 0        // 1 sample  and  4.5ms for conversion
+#define BMP180_OSS_NORMAL          1        // 2 samples and  7.5ms for conversion
+#define BMP180_OSS_HIGH_RESOLUTION 2        // 4 samples and 13.5ms for conversion
+#define BMP180_OSS_ULTRA_HIGH_RESOLUTION 3  // 8 samples and 25.5ms for conversion
+
+#define UNSET_BMP180_PRESSURE_VALUE 0.F
+#define UNSET_BMP180_TEMPERATURE_VALUE -273.15F // absolute zero
+
+/** BMP180 class.
+ *  Read Pressure and temperature from the BMP180 Breakout I2C sensor
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "BMP180.h"
+ * 
+ * #if defined(TARGET_LPC1768)
+ *     #define PIN_SDA p9
+ *     #define PIN_SCL p10
+ * #elif defined(TARGET_KL25Z) // watch out for the PTE0/PTE1 mixed up in the KL25Z doc 
+ *     #define PIN_SDA PTE0
+ *     #define PIN_SCL PTE1
+ * #endif
+ * 
+ * int main() 
+ * {    
+ *     BMP180 bmp180(PIN_SDA, PIN_SCL);
+ *     float pressure, temperature;
+ *     
+ *     bmp180.Initialize(64, BMP180_OSS_NORMAL); // 64m altitude compensation and normal oversampling
+ *     
+ *     while(1) {        
+ *         if (bmp180.ReadData(&pressure, &temperature))
+ *             printf("Pressure(hPa): %8.2f \t Temperature(C): %8.2f\n", pressure, temperature);  
+ *         wait(1);
+ *     }
+ * }
+ * @endcode
+ */
+class BMP180 
+{
+
+public:
+
+    /** Create a BMP180 instance
+     * @param sda pin 
+     * @param scl pin 
+     * @param address: I2C slave address 
+     */
+    BMP180(PinName sda, PinName scl, int address = BMP180_I2C_ADDRESS); 
+
+    /** Create a BMP180 instance
+     * @param i2c object
+     * @param address: I2C slave address 
+     */
+    BMP180(I2C& i2c, int address = BMP180_I2C_ADDRESS); 
+
+    /** Initialization: set member values and read BMP180 calibration parameters
+     * @param altitude (in meter)
+     * @param overSamplingSetting 
+     */
+    int Initialize(float altitude = 0.F, int overSamplingSetting = BMP180_OSS_NORMAL);
+
+    /** Read pressure and temperature from the BMP180.
+     * @param pressure (hPa) 
+     * @param temperature (C) 
+     * @returns
+     *   1 on success,
+     *   0 on error
+     */    
+    int ReadData(float* pTemperature = NULL, float* pPressure = NULL);
+
+    /** Get temperature from a previous measurement 
+     *  
+     * @returns
+     *   temperature (C)
+     */    
+    float GetTemperature() {return m_temperature;};
+
+     /** Get pressure from a previous measurement 
+     *  
+     * @returns
+     *   pressure (hPa)
+     */    
+   float GetPressure() {return m_pressure;};
+
+protected:
+
+    /** Perform temperature measurement
+     *  
+     * @returns
+     *   temperature (C)
+     */    
+    int ReadRawTemperature(long* pUt);
+
+    /** Perform pressure measurement 
+     *  
+     * @returns
+     *   temperature (C)
+     */    
+    int ReadRawPressure(long* pUp);
+
+    /** Calculation of the temperature from the digital output
+     */    
+    float TrueTemperature(long ut);
+
+    /** Calculation of the pressure from the digital output
+     */    
+    float TruePressure(long up);
+
+    int m_oss;
+    float m_temperature;     
+    float m_pressure;
+    float m_altitude;
+
+    I2C m_i2c;   
+    int m_addr;
+    char m_data[4];    
+
+    short ac1, ac2, ac3; 
+    unsigned short ac4, ac5, ac6;
+    short b1, b2;
+    short mb, mc, md;
+    long x1, x2, x3, b3, b5, b6;
+    unsigned long b4, b7;
+
+};
+
+#endif
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