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Port of Adafruit Arduino code
Fork of Adafruit9-DOf by
Diff: Source/Adafruit_LSM303_U.cpp
- Revision:
- 0:772bf4786416
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Source/Adafruit_LSM303_U.cpp Sat Mar 21 12:33:05 2015 +0000 @@ -0,0 +1,416 @@ +/*************************************************************************** + This is a library for the LSM303 Accelerometer and magnentometer/compass + + Designed specifically to work with the Adafruit LSM303DLHC Breakout + + 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 "Adafruit_LSM303_U.h" +#include "Serial_base.h" + +static float _lsm303Accel_MG_LSB = 0.001F; // 1, 2, 4 or 12 mg per lsb +static float _lsm303Mag_Gauss_LSB_XY = 1100.0F; // Varies with gain +static float _lsm303Mag_Gauss_LSB_Z = 980.0F; // Varies with gain + +/*************************************************************************** + ACCELEROMETER + ***************************************************************************/ +/*************************************************************************** + PRIVATE FUNCTIONS + ***************************************************************************/ + +/**************************************************************************/ +/*! + @brief Abstract away platform differences in Arduino wire library +*/ +/**************************************************************************/ +void Adafruit_LSM303_Accel_Unified::write8(byte address, byte reg, byte value) +{ + byte data[2] = {reg, value}; + i2c->write(address,data,2); +} + +/**************************************************************************/ +/*! + @brief Abstract away platform differences in Arduino wire library +*/ +/**************************************************************************/ +byte Adafruit_LSM303_Accel_Unified::read8(byte address, byte reg) +{ + byte value; + + i2c->writeByte(address, reg); + i2c->read(address, &value, 1); + + return value; +} + +/**************************************************************************/ +/*! + @brief Reads the raw data from the sensor +*/ +/**************************************************************************/ +void Adafruit_LSM303_Accel_Unified::read() +{ + // Read the accelerometer + i2c->writeByte(LSM303_ADDRESS_ACCEL, LSM303_REGISTER_ACCEL_OUT_X_L_A | 0x80); + + byte data[6]; + i2c->read(LSM303_ADDRESS_ACCEL, data, 6); + + // Shift values to create properly formed integer (low byte first) + _accelData.x = (int16_t)(data[0] | (data[1] << 8)) >> 4; + _accelData.y = (int16_t)(data[2] | (data[3] << 8)) >> 4; + _accelData.z = (int16_t)(data[4] | (data[5] << 8)) >> 4; +} + +/*************************************************************************** + CONSTRUCTOR + ***************************************************************************/ + +/**************************************************************************/ +/*! + @brief Instantiates a new Adafruit_LSM303 class +*/ +/**************************************************************************/ +Adafruit_LSM303_Accel_Unified::Adafruit_LSM303_Accel_Unified(int32_t sensorID) { + _sensorID = sensorID; +} + +/*************************************************************************** + PUBLIC FUNCTIONS + ***************************************************************************/ + +/**************************************************************************/ +/*! + @brief Setups the HW +*/ +/**************************************************************************/ +bool Adafruit_LSM303_Accel_Unified::begin() +{ + // Enable I2C + // Enable the accelerometer (100Hz) + write8(LSM303_ADDRESS_ACCEL, LSM303_REGISTER_ACCEL_CTRL_REG1_A, 0x57); + + // LSM303DLHC has no WHOAMI register so read CTRL_REG1_A back to check + // if we are connected or not + uint8_t reg1_a = read8(LSM303_ADDRESS_ACCEL, LSM303_REGISTER_ACCEL_CTRL_REG1_A); + if (reg1_a != 0x57) + { + return false; + } + + return true; +} + +/**************************************************************************/ +/*! + @brief Gets the most recent sensor event +*/ +/**************************************************************************/ +void Adafruit_LSM303_Accel_Unified::getEvent(sensors_event_t *event) { + /* Clear the event */ + memset(event, 0, sizeof(sensors_event_t)); + + /* Read new data */ + read(); + + event->version = sizeof(sensors_event_t); + event->sensor_id = _sensorID; + event->type = SENSOR_TYPE_ACCELEROMETER; + event->timestamp = millis(); + event->acceleration.x = _accelData.x * _lsm303Accel_MG_LSB * SENSORS_GRAVITY_STANDARD; + event->acceleration.y = _accelData.y * _lsm303Accel_MG_LSB * SENSORS_GRAVITY_STANDARD; + event->acceleration.z = _accelData.z * _lsm303Accel_MG_LSB * SENSORS_GRAVITY_STANDARD; +} + +/**************************************************************************/ +/*! + @brief Gets the sensor_t data +*/ +/**************************************************************************/ +void Adafruit_LSM303_Accel_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, "LSM303", sizeof(sensor->name) - 1); + sensor->name[sizeof(sensor->name)- 1] = 0; + sensor->version = 1; + sensor->sensor_id = _sensorID; + sensor->type = SENSOR_TYPE_ACCELEROMETER; + sensor->min_delay = 0; + sensor->max_value = 0.0F; // TBD + sensor->min_value = 0.0F; // TBD + sensor->resolution = 0.0F; // TBD +} + +/*************************************************************************** + MAGNETOMETER + ***************************************************************************/ +/*************************************************************************** + PRIVATE FUNCTIONS + ***************************************************************************/ + +/**************************************************************************/ +/*! + @brief Abstract away platform differences in Arduino wire library +*/ +/**************************************************************************/ +void Adafruit_LSM303_Mag_Unified::write8(byte address, byte reg, byte value) +{ + byte data[2] = {reg, value}; + i2c->write(address,data,2); +} + +/**************************************************************************/ +/*! + @brief Abstract away platform differences in Arduino wire library +*/ +/**************************************************************************/ +byte Adafruit_LSM303_Mag_Unified::read8(byte address, byte reg) +{ + byte value; + i2c->writeByte(address, reg); + i2c->read(address, &value, 1); + + return value; +} + +/**************************************************************************/ +/*! + @brief Reads the raw data from the sensor +*/ +/**************************************************************************/ +void Adafruit_LSM303_Mag_Unified::read() +{ + // Read the magnetometer + i2c->writeByte(LSM303_ADDRESS_MAG, LSM303_REGISTER_MAG_OUT_X_H_M); + + byte data[6]; + i2c->read(LSM303_ADDRESS_MAG, data, 6); + + + // Shift values to create properly formed integer (low byte first) + _magData.x = (int16_t)(data[0] | ((int16_t)data[1] << 8)); + _magData.y = (int16_t)(data[2] | ((int16_t)data[3] << 8)); + _magData.z = (int16_t)(data[4] | ((int16_t)data[5] << 8)); + + // ToDo: Calculate orientation + _magData.orientation = 0.0; +} + +/*************************************************************************** + CONSTRUCTOR + ***************************************************************************/ + +/**************************************************************************/ +/*! + @brief Instantiates a new Adafruit_LSM303 class +*/ +/**************************************************************************/ +Adafruit_LSM303_Mag_Unified::Adafruit_LSM303_Mag_Unified(int32_t sensorID) { + _sensorID = sensorID; + _autoRangeEnabled = false; +} + +/*************************************************************************** + PUBLIC FUNCTIONS + ***************************************************************************/ + +/**************************************************************************/ +/*! + @brief Setups the HW +*/ +/**************************************************************************/ +bool Adafruit_LSM303_Mag_Unified::begin() +{ + // Enable I2C + + + // Enable the magnetometer + write8(LSM303_ADDRESS_MAG, LSM303_REGISTER_MAG_MR_REG_M, 0x00); + + // LSM303DLHC has no WHOAMI register so read CRA_REG_M to check + // the default value (0b00010000/0x10) + uint8_t reg1_a = read8(LSM303_ADDRESS_MAG, LSM303_REGISTER_MAG_CRA_REG_M); + if (reg1_a != 0x10) + { + return false; + } + + // Set the gain to a known level + setMagGain(LSM303_MAGGAIN_1_3); + + return true; +} + +/**************************************************************************/ +/*! + @brief Enables or disables auto-ranging +*/ +/**************************************************************************/ +void Adafruit_LSM303_Mag_Unified::enableAutoRange(bool enabled) +{ + _autoRangeEnabled = enabled; +} + +/**************************************************************************/ +/*! + @brief Sets the magnetometer's gain +*/ +/**************************************************************************/ +void Adafruit_LSM303_Mag_Unified::setMagGain(lsm303MagGain gain) +{ + write8(LSM303_ADDRESS_MAG, LSM303_REGISTER_MAG_CRB_REG_M, (byte)gain); + + _magGain = gain; + + switch(gain) + { + case LSM303_MAGGAIN_1_3: + _lsm303Mag_Gauss_LSB_XY = 1100; + _lsm303Mag_Gauss_LSB_Z = 980; + break; + case LSM303_MAGGAIN_1_9: + _lsm303Mag_Gauss_LSB_XY = 855; + _lsm303Mag_Gauss_LSB_Z = 760; + break; + case LSM303_MAGGAIN_2_5: + _lsm303Mag_Gauss_LSB_XY = 670; + _lsm303Mag_Gauss_LSB_Z = 600; + break; + case LSM303_MAGGAIN_4_0: + _lsm303Mag_Gauss_LSB_XY = 450; + _lsm303Mag_Gauss_LSB_Z = 400; + break; + case LSM303_MAGGAIN_4_7: + _lsm303Mag_Gauss_LSB_XY = 400; + _lsm303Mag_Gauss_LSB_Z = 355; + break; + case LSM303_MAGGAIN_5_6: + _lsm303Mag_Gauss_LSB_XY = 330; + _lsm303Mag_Gauss_LSB_Z = 295; + break; + case LSM303_MAGGAIN_8_1: + _lsm303Mag_Gauss_LSB_XY = 230; + _lsm303Mag_Gauss_LSB_Z = 205; + break; + } +} + +/**************************************************************************/ +/*! + @brief Gets the most recent sensor event +*/ +/**************************************************************************/ +void Adafruit_LSM303_Mag_Unified::getEvent(sensors_event_t *event) { + bool readingValid = false; + + /* Clear the event */ + memset(event, 0, sizeof(sensors_event_t)); + + while(!readingValid) + { + /* Read new data */ + read(); + + /* Make sure the sensor isn't saturating if auto-ranging is enabled */ + if (!_autoRangeEnabled) + { + readingValid = true; + } + else + { + s_com->print(_magData.x); s_com->print(" "); + s_com->print(_magData.y); s_com->print(" "); + s_com->print(_magData.z); s_com->println(" "); + /* Check if the sensor is saturating or not */ + if ( (_magData.x >= 2040) | (_magData.x <= -2040) | + (_magData.y >= 2040) | (_magData.y <= -2040) | + (_magData.z >= 2040) | (_magData.z <= -2040) ) + { + /* Saturating .... increase the range if we can */ + switch(_magGain) + { + case LSM303_MAGGAIN_5_6: + setMagGain(LSM303_MAGGAIN_8_1); + readingValid = false; + s_com->println("Changing range to +/- 8.1"); + break; + case LSM303_MAGGAIN_4_7: + setMagGain(LSM303_MAGGAIN_5_6); + readingValid = false; + s_com->println("Changing range to +/- 5.6"); + break; + case LSM303_MAGGAIN_4_0: + setMagGain(LSM303_MAGGAIN_4_7); + readingValid = false; + s_com->println("Changing range to +/- 4.7"); + break; + case LSM303_MAGGAIN_2_5: + setMagGain(LSM303_MAGGAIN_4_0); + readingValid = false; + s_com->println("Changing range to +/- 4.0"); + break; + case LSM303_MAGGAIN_1_9: + setMagGain(LSM303_MAGGAIN_2_5); + readingValid = false; + s_com->println("Changing range to +/- 2.5"); + break; + case LSM303_MAGGAIN_1_3: + setMagGain(LSM303_MAGGAIN_1_9); + readingValid = false; + s_com->println("Changing range to +/- 1.9"); + break; + default: + readingValid = true; + break; + } + } + else + { + /* All values are withing range */ + readingValid = true; + } + } + } + + event->version = sizeof(sensors_event_t); + event->sensor_id = _sensorID; + event->type = SENSOR_TYPE_MAGNETIC_FIELD; + event->timestamp = millis(); + event->magnetic.x = _magData.x / _lsm303Mag_Gauss_LSB_XY * SENSORS_GAUSS_TO_MICROTESLA; + event->magnetic.y = _magData.y / _lsm303Mag_Gauss_LSB_XY * SENSORS_GAUSS_TO_MICROTESLA; + event->magnetic.z = _magData.z / _lsm303Mag_Gauss_LSB_Z * SENSORS_GAUSS_TO_MICROTESLA; +} + +/**************************************************************************/ +/*! + @brief Gets the sensor_t data +*/ +/**************************************************************************/ +void Adafruit_LSM303_Mag_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, "LSM303", sizeof(sensor->name) - 1); + sensor->name[sizeof(sensor->name)- 1] = 0; + sensor->version = 1; + sensor->sensor_id = _sensorID; + sensor->type = SENSOR_TYPE_MAGNETIC_FIELD; + sensor->min_delay = 0; + sensor->max_value = 0.0F; // TBD + sensor->min_value = 0.0F; // TBD + sensor->resolution = 0.0F; // TBD +}