Modified to run on Renesas GR Peach board
Dependencies: EthernetInterface HTTP-Server Webpage mbed-rpc mbed-src
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Adafruit_10DOF/Adafruit_BMP085_U.cpp
- Committer:
- webOnBoard
- Date:
- 2015-10-07
- Revision:
- 16:5d102be2566c
File content as of revision 16:5d102be2566c:
/*************************************************************************** This is a library for the BMP085 pressure sensor Designed specifically to work with the Adafruit BMP085 or BMP180 Breakout ----> http://www.adafruit.com/products/391 ----> http://www.adafruit.com/products/1603 These displays use I2C to communicate, 2 pins are required to interface. Adafruit invests time and resources providing this open source code, please support Adafruit andopen-source hardware by purchasing products from Adafruit! Written by Kevin Townsend for Adafruit Industries. BSD license, all text above must be included in any redistribution ***************************************************************************/ //#include "mbed.h" //#include "I2C.h" #include "Adafruit_BMP085_U.h" static bmp085_calib_data _bmp085_coeffs; // Last read accelerometer data will be available here static uint8_t _bmp085Mode; #define BMP085_USE_DATASHEET_VALS (0) /* Set to 1 for sanity check */ typedef uint8_t byte; //extern i2c; //extern I2C* i2c; //extern mbed::I2C* i2c; //extern mbed::I2C* i2c(I2C_SDA, I2C_SCL); //extern I2C i2c(); //extern i2c(I2C_SDA, I2C_SCL); //extern int i2c(I2C_SDA, I2C_SCL); //extern I2C i2c(I2C_SDA, I2C_SCL); // sda, scl /*************************************************************************** PRIVATE FUNCTIONS ***************************************************************************/ /**************************************************************************/ /*! @brief Writes an 8 bit value over I2C */ /**************************************************************************/ static void writeCommand(byte reg, byte value) { char data_write[2]; data_write[0] = reg; data_write[1] = value; int status = i2c->write(BMP085_ADDRESS, data_write, 2, 0); } /**************************************************************************/ /*! @brief Reads an 8 bit value over I2C */ /**************************************************************************/ static void read8(byte reg, uint8_t *value) { char data_write[2]; char data_read[2]; // Read register data_write[0] = reg; i2c->write(BMP085_ADDRESS, data_write, 1, 1); // no stop i2c->read(BMP085_ADDRESS, data_read, 2, 0); } /**************************************************************************/ /*! @brief Reads a 16 bit value over I2C */ /**************************************************************************/ static void read16(byte reg, uint16_t *value) { char data_write[2]; char data_read[2]; //uint8_t data_read[2]; //Sample_RIIC_Read( (uint8_t)BMP085_ADDRESS,reg,1, data_read); data_write[0] = reg; i2c->write(BMP085_ADDRESS, data_write, 1, 1); // no stop i2c->read(BMP085_ADDRESS, data_read, 2, 0); *value = (((uint16_t)data_read[0]) << 8) | ((uint16_t)data_read[1]); } /**************************************************************************/ /*! @brief Reads a signed 16 bit value over I2C */ /**************************************************************************/ static void readS16(byte reg, int16_t *value) { uint16_t i; read16(reg, &i); *value = (int16_t)i; } /**************************************************************************/ /*! @brief Reads the factory-set coefficients */ /**************************************************************************/ static void readCoefficients(void) { #if BMP085_USE_DATASHEET_VALS _bmp085_coeffs.ac1 = 408; _bmp085_coeffs.ac2 = -72; _bmp085_coeffs.ac3 = -14383; _bmp085_coeffs.ac4 = 32741; _bmp085_coeffs.ac5 = 32757; _bmp085_coeffs.ac6 = 23153; _bmp085_coeffs.b1 = 6190; _bmp085_coeffs.b2 = 4; _bmp085_coeffs.mb = -32768; _bmp085_coeffs.mc = -8711; _bmp085_coeffs.md = 2868; _bmp085Mode = 0; #else readS16(BMP085_REGISTER_CAL_AC1, &_bmp085_coeffs.ac1); readS16(BMP085_REGISTER_CAL_AC2, &_bmp085_coeffs.ac2); readS16(BMP085_REGISTER_CAL_AC3, &_bmp085_coeffs.ac3); read16(BMP085_REGISTER_CAL_AC4, &_bmp085_coeffs.ac4); read16(BMP085_REGISTER_CAL_AC5, &_bmp085_coeffs.ac5); read16(BMP085_REGISTER_CAL_AC6, &_bmp085_coeffs.ac6); readS16(BMP085_REGISTER_CAL_B1, &_bmp085_coeffs.b1); readS16(BMP085_REGISTER_CAL_B2, &_bmp085_coeffs.b2); readS16(BMP085_REGISTER_CAL_MB, &_bmp085_coeffs.mb); readS16(BMP085_REGISTER_CAL_MC, &_bmp085_coeffs.mc); readS16(BMP085_REGISTER_CAL_MD, &_bmp085_coeffs.md); #endif } /**************************************************************************/ /*! */ /**************************************************************************/ static void readRawTemperature(int32_t *temperature) { #if BMP085_USE_DATASHEET_VALS *temperature = 27898; #else uint16_t t; writeCommand(BMP085_REGISTER_CONTROL, BMP085_REGISTER_READTEMPCMD); wait(5);//delay(5); read16(BMP085_REGISTER_TEMPDATA, &t); *temperature = t; #endif } /**************************************************************************/ /*! */ /**************************************************************************/ static void readRawPressure(int32_t *pressure) { #if BMP085_USE_DATASHEET_VALS *pressure = 23843; #else uint8_t p8; uint16_t p16; int32_t p32; writeCommand(BMP085_REGISTER_CONTROL, BMP085_REGISTER_READPRESSURECMD + (_bmp085Mode << 6)); switch(_bmp085Mode) { case BMP085_MODE_ULTRALOWPOWER: wait(5);//delay(5); break; case BMP085_MODE_STANDARD: wait(8);//delay(8); break; case BMP085_MODE_HIGHRES: wait(14);//delay(14); break; case BMP085_MODE_ULTRAHIGHRES: default: wait(26);//delay(26); break; } read16(BMP085_REGISTER_PRESSUREDATA, &p16); p32 = (uint32_t)p16 << 8; read8(BMP085_REGISTER_PRESSUREDATA+2, &p8); p32 += p8; p32 >>= (8 - _bmp085Mode); *pressure = p32; #endif } /**************************************************************************/ /*! @brief Compute B5 coefficient used in temperature & pressure calcs. */ /**************************************************************************/ int32_t Adafruit_BMP085_Unified::computeB5(int32_t ut) { int32_t X1 = (ut - (int32_t)_bmp085_coeffs.ac6) * ((int32_t)_bmp085_coeffs.ac5) >> 15; int32_t X2 = ((int32_t)_bmp085_coeffs.mc << 11) / (X1+(int32_t)_bmp085_coeffs.md); return X1 + X2; } /*************************************************************************** CONSTRUCTOR ***************************************************************************/ /**************************************************************************/ /*! @brief Instantiates a new Adafruit_BMP085_Unified class */ /**************************************************************************/ Adafruit_BMP085_Unified::Adafruit_BMP085_Unified(int32_t sensorID) { _sensorID = sensorID; } /*************************************************************************** PUBLIC FUNCTIONS ***************************************************************************/ /**************************************************************************/ /*! @brief Setups the HW */ /**************************************************************************/ bool Adafruit_BMP085_Unified::begin(bmp085_mode_t mode) { // Enable I2C //Wire.begin(); /* Mode boundary check */ if ((mode > BMP085_MODE_ULTRAHIGHRES) || (mode < 0)) { mode = BMP085_MODE_ULTRAHIGHRES; } /* Make sure we have the right device */ uint8_t id; read8(BMP085_REGISTER_CHIPID, &id); if(id != 0x55) { return false; } /* Set the mode indicator */ _bmp085Mode = mode; /* Coefficients need to be read once */ readCoefficients(); return true; } /**************************************************************************/ /*! @brief Gets the compensated pressure level in kPa */ /**************************************************************************/ void Adafruit_BMP085_Unified::getPressure(float *pressure) { int32_t ut = 0, up = 0, compp = 0; int32_t x1, x2, b5, b6, x3, b3, p; uint32_t b4, b7; /* Get the raw pressure and temperature values */ readRawTemperature(&ut); readRawPressure(&up); /* Temperature compensation */ b5 = computeB5(ut); /* Pressure compensation */ b6 = b5 - 4000; x1 = (_bmp085_coeffs.b2 * ((b6 * b6) >> 12)) >> 11; x2 = (_bmp085_coeffs.ac2 * b6) >> 11; x3 = x1 + x2; b3 = (((((int32_t) _bmp085_coeffs.ac1) * 4 + x3) << _bmp085Mode) + 2) >> 2; x1 = (_bmp085_coeffs.ac3 * b6) >> 13; x2 = (_bmp085_coeffs.b1 * ((b6 * b6) >> 12)) >> 16; x3 = ((x1 + x2) + 2) >> 2; b4 = (_bmp085_coeffs.ac4 * (uint32_t) (x3 + 32768)) >> 15; b7 = ((uint32_t) (up - b3) * (50000 >> _bmp085Mode)); if (b7 < 0x80000000) { p = (b7 << 1) / b4; } else { p = (b7 / b4) << 1; } x1 = (p >> 8) * (p >> 8); x1 = (x1 * 3038) >> 16; x2 = (-7357 * p) >> 16; compp = p + ((x1 + x2 + 3791) >> 4); /* Assign compensated pressure value */ *pressure = compp; } /**************************************************************************/ /*! @brief Reads the temperatures in degrees Celsius */ /**************************************************************************/ void Adafruit_BMP085_Unified::getTemperature(float *temp) { int32_t UT, X1, X2, B5; // following ds convention float t; readRawTemperature(&UT); #if BMP085_USE_DATASHEET_VALS // use datasheet numbers! UT = 27898; _bmp085_coeffs.ac6 = 23153; _bmp085_coeffs.ac5 = 32757; _bmp085_coeffs.mc = -8711; _bmp085_coeffs.md = 2868; #endif B5 = computeB5(UT); t = (B5+8) >> 4; t /= 10; *temp = t; } /**************************************************************************/ /*! Calculates the altitude (in meters) from the specified atmospheric pressure (in hPa), and sea-level pressure (in hPa). @param seaLevel Sea-level pressure in hPa @param atmospheric Atmospheric pressure in hPa */ /**************************************************************************/ float Adafruit_BMP085_Unified::pressureToAltitude(float seaLevel, float atmospheric) { // Equation taken from BMP180 datasheet (page 16): // http://www.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf // Note that using the equation from wikipedia can give bad results // at high altitude. See this thread for more information: // http://forums.adafruit.com/viewtopic.php?f=22&t=58064 float y = 0.1903; float x; x = atmospheric / seaLevel; return 44330.0 * (1.0 - pow(x, y)); // 0.1903)); } /**************************************************************************/ /*! Calculates the altitude (in meters) from the specified atmospheric pressure (in hPa), and sea-level pressure (in hPa). Note that this function just calls the overload of pressureToAltitude which takes seaLevel and atmospheric pressure--temperature is ignored. The original implementation of this function was based on calculations from Wikipedia which are not accurate at higher altitudes. To keep compatibility with old code this function remains with the same interface, but it calls the more accurate calculation. @param seaLevel Sea-level pressure in hPa @param atmospheric Atmospheric pressure in hPa @param temp Temperature in degrees Celsius */ /**************************************************************************/ float Adafruit_BMP085_Unified::pressureToAltitude(float seaLevel, float atmospheric, float temp) { return pressureToAltitude(seaLevel, atmospheric); } /**************************************************************************/ /*! Calculates the pressure at sea level (in hPa) from the specified altitude (in meters), and atmospheric pressure (in hPa). @param altitude Altitude in meters @param atmospheric Atmospheric pressure in hPa */ /**************************************************************************/ float Adafruit_BMP085_Unified::seaLevelForAltitude(float altitude, float atmospheric) { // Equation taken from BMP180 datasheet (page 17): // http://www.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf // Note that using the equation from wikipedia can give bad results // at high altitude. See this thread for more information: // http://forums.adafruit.com/viewtopic.php?f=22&t=58064 return atmospheric / pow(1.0 - (altitude/44330.0), 5.255); } /**************************************************************************/ /*! Calculates the pressure at sea level (in hPa) from the specified altitude (in meters), and atmospheric pressure (in hPa). Note that this function just calls the overload of seaLevelForAltitude which takes altitude and atmospheric pressure--temperature is ignored. The original implementation of this function was based on calculations from Wikipedia which are not accurate at higher altitudes. To keep compatibility with old code this function remains with the same interface, but it calls the more accurate calculation. @param altitude Altitude in meters @param atmospheric Atmospheric pressure in hPa @param temp Temperature in degrees Celsius */ /**************************************************************************/ float Adafruit_BMP085_Unified::seaLevelForAltitude(float altitude, float atmospheric, float temp) { return seaLevelForAltitude(altitude, atmospheric); } /**************************************************************************/ /*! @brief Provides the sensor_t data for this sensor */ /**************************************************************************/ void Adafruit_BMP085_Unified::getSensor(sensor_t *sensor) { /* Clear the sensor_t object */ memset(sensor, 0, sizeof(sensor_t)); /* Insert the sensor name in the fixed length char array */ strncpy (sensor->name, "BMP085", sizeof(sensor->name) - 1); sensor->name[sizeof(sensor->name)- 1] = 0; sensor->version = 1; sensor->sensor_id = _sensorID; sensor->type = SENSOR_TYPE_PRESSURE; sensor->min_delay = 0; sensor->max_value = 1100.0F; // 300..1100 hPa sensor->min_value = 300.0F; sensor->resolution = 0.01F; // Datasheet states 0.01 hPa resolution } /**************************************************************************/ /*! @brief Reads the sensor and returns the data as a sensors_event_t */ /**************************************************************************/ bool Adafruit_BMP085_Unified::getEvent(sensors_event_t *event) { float pressure_kPa; /* Clear the event */ memset(event, 0, sizeof(sensors_event_t)); event->version = sizeof(sensors_event_t); event->sensor_id = _sensorID; event->type = SENSOR_TYPE_PRESSURE; event->timestamp = 0; getPressure(&pressure_kPa); event->pressure = pressure_kPa / 100.0F; return true; }