File content as of revision 0:df3b9e41edf3:

/**
@file MMA8452.h

@brief Header file containing member functions and variables

*/

#ifndef MMA8452_H
#define MMA8452_H

// MMA8452 address is 0x1D by default (see EAGLE schematic of breakout - SA = 1)
#define MMA8452_W_ADDRESS   0x3A
#define MMA8452_R_ADDRESS   0x3B
// Register Descriptions - p18 datasheet
#define OUT_X_MSB           0x01
#define WHO_AM_I            0x0D
#define CTRL_REG1           0x2A
#define XYZ_DATA_CFG        0x0E

typedef struct Acceleration Acceleration;
struct Acceleration {
    float x;
    float y;
    float z;
};

#include "mbed.h"

/**
@brief Library for interfacing with MMA8452 I2C Accelerometer

@see http://www.freescale.com/files/sensors/doc/data_sheet/MMA8452Q.pdf
@see https://www.sparkfun.com/products/12756

@brief Revision 1.0

@author Craig A. Evans
@date   March 2015
 *
 * Example:
 * @code

#include "mbed.h"
#include "MMA8452.h"

MMA8452 mma8452(p28,p27);  // SDA, SCL
Serial serial(USBTX,USBRX);

int main() {

    mma8452.init();  // 100 Hz update rate, ±4g scale

    Acceleration acceleration;  // Accleration structure declared in MMA8452 class

    while(1) {

        acceleration = mma8452.readValues();   // read current values and print over serial port
        serial.printf("x = %.2f g y = %.2f g z = %.2f g\n",acceleration.x,acceleration.y,acceleration.z);
        wait(0.1);   // short delay until next reading

    }

}


 * @endcode
 */
class MMA8452
{

public:
    /** Create a MMA8452 object connected to the specified pins
    *
    * @param sdaPin - mbed SDA pin
    * @param sclPin - mbed SCL pin
    *
    */
    MMA8452(PinName sdaPin, PinName sclPin);

    /** Initialise accelerometer
    *
    *   Powers up the accelerometer, sets 100 Hz update rate and ±4g scale
    */
    void init();

    /** Get values of acceleration
    *
    *   Reads the x,y,z values in g's
    *   @returns an Acceleration structure with x,y,z members (float)
    */
    Acceleration readValues();


private:
    void sendByteToRegister(char byte,char reg);
    char readByteFromRegister(char reg);
    void readBytesFromRegister(char reg,int numberOfBytes,char bytes[]);
    void error();

public:

private:  // private variables
    I2C*    i2c;
    BusOut*  leds;

};



#endif