BMP180 Pressure/Temperature Sensor library
Dependents: GliderFuncTest1 DropTest
Fork of BMP180 by
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 \ No newline at end of file