File content as of revision 3:147d95b7a525:

/**
 * @section LICENSE
 *
 *
 * @section DESCRIPTION
 *
 * LIS331 triple axis, digital interface, accelerometer.
 * Based off Aaron Berk's ITG3200 Gyro Library 
 *
 * Datasheet:
 *
 * http://www.st.com/stonline/products/literature/ds/13951.pdf
 */

/**
 * Includes
 */
 
#include "LIS331.h"

LIS331::LIS331(PinName sda, PinName scl) : i2c_(sda, scl) {

    //400kHz, fast mode.
    i2c_.frequency(400000);
    
    
    //Power Up Device, Set Output data rate, Enable All 3 Axis
    //See datasheet for details.
    char tx[2];
    //char tx2[2];
    //char rx[1];
    tx[0] = CTRL_REG_1;
    //CTRL_REG_1 [00111111] / [0x3F] to power up, set output rate to 1000Hz, and enable all 3 axis.
    tx[1] = 0x3F;
    i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, tx, 2);
    
    
    // Set Big endian bit
    //tx2[0] = CTRL_REG_4;
    //i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, tx2, 1);   // Request control reg 4
    //i2c_.read((LIS331_I2C_ADDRESS << 1) | 0x01, rx, 1);        //Read control reg 4
    //tx2[1] = rx[0] | 1<<7;                                         // Set bit 7
    //i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, tx2, 2);
    
}

char LIS331::getWhoAmI(void){

    //WhoAmI Register address.
    char tx = WHO_AM_I_REG_LIS331;
    char rx;
    
    i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, &tx, 1);
    
    i2c_.read((LIS331_I2C_ADDRESS << 1) | 0x01, &rx, 1);
    
    return rx;

}




void LIS331::setPowerMode(char power_mode){
// Currently sets all 3 axis to enabled. Will be set to preserve existing status in future
    char tx[2];
    tx[0] = CTRL_REG_1;
    tx[1] = power_mode;

    i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, tx, 2);

}

char LIS331::getPowerMode(void){

    char tx = CTRL_REG_1;
    char rx;
    
    i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, &tx, 1);
    
    i2c_.read((LIS331_I2C_ADDRESS << 1) | 0x01, &rx, 1);

    
    return rx;

}



char LIS331::getInterruptConfiguration(void){

    char tx = CTRL_REG_3;
    char rx;
    
    i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, &tx, 1);
    
    i2c_.read((LIS331_I2C_ADDRESS << 1) | 0x01, &rx, 1);
    
    return rx;

}



char LIS331::getAccelStatus(void){

    char tx = STATUS_REG;
    char rx;
    
    i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, &tx, 1);
    
    i2c_.read((LIS331_I2C_ADDRESS << 1) | 0x01, &rx, 1);
    
    return rx;
}



int LIS331::getAccelX(void){

    char tx = ACCEL_XOUT_H_REG;
    char rx[2];
    
    i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, &tx, 1);
    
    i2c_.read((LIS331_I2C_ADDRESS << 1) | 0x01, rx, 2);
    
    int16_t output = ((int) rx[0] << 8) | ((int) rx[1]);

    return output;

}

int LIS331::getAccelY(void){

    char tx = ACCEL_YOUT_H_REG;
    char rx[2];
    
    i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, &tx, 1);
    
    i2c_.read((LIS331_I2C_ADDRESS << 1) | 0x01, rx, 2);
    
    int16_t output = ((int) rx[0] << 8) | ((int) rx[1]);

    return output;

}

int LIS331::getAccelZ(void){

    char tx = ACCEL_ZOUT_H_REG;
    char rx[2];
    
    i2c_.write((LIS331_I2C_ADDRESS << 1) & 0xFE, &tx, 1);
    
    i2c_.read((LIS331_I2C_ADDRESS << 1) | 0x01, rx, 2);
    
    int16_t output = ((int) rx[0] << 8) | ((int) rx[1]);

    return output;
}