MMA8652.h

00001 /* Copyright (c) 2010-2011 mbed.org, MIT License
00002 *
00003 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004 * and associated documentation files (the "Software"), to deal in the Software without
00005 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
00006 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
00007 * Software is furnished to do so, subject to the following conditions:
00008 *
00009 * The above copyright notice and this permission notice shall be included in all copies or
00010 * substantial portions of the Software.
00011 *
00012 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017 */
00018 
00019 #ifndef MMA8652_H
00020 #define MMA8652_H
00021 
00022 #include "mbed.h"
00023 
00024 
00025 // MMA8652 Slave Address
00026 #define MMA8652_SLAVE_ADDR 0x3A
00027 
00028 // MMA8652 internal register addresses
00029 #define MMA8652_STATUS 0x00
00030 #define MMA8652_OUT_X_MSB 0x01
00031 #define MMA8652_WHOAMI 0x0D
00032 #define MMA8652_XYZ_DATA_CFG 0x0E
00033 #define MMA8652_CTRL_REG1 0x2A
00034 #define MMA8652_WHOAMI_VAL 0x4A
00035 
00036 /**
00037  * MMA8652 Xtrinsic accelerometer on I2C
00038  */
00039 class MMA8652
00040 {
00041 public:
00042     /**
00043      * MMA8652 constructor
00044      *
00045      * @param sda SDA pin
00046      * @param sdl SCL pin
00047      */
00048     MMA8652(PinName sda, PinName scl);
00049 
00050     /**
00051      * MMA8652 destructor
00052      */
00053     ~MMA8652();
00054     
00055     /**
00056      * Get XYZ axis acceleration in floating point G's
00057      *
00058      * @param res array where acceleration data will be stored
00059      */
00060     void ReadXYZ(float * a);
00061 
00062     /**
00063      * Get XYZ axis acceleration, signed 16 bit values
00064      *
00065      * @param res array where acceleration data will be stored
00066      */
00067     void ReadXYZraw(int16_t * d);
00068     
00069     /**
00070      * Get the value of the WHO_AM_I register
00071      *
00072      * @returns DEVICE_ID value == 0x3A
00073      */
00074     char getWhoAmI(void);
00075 
00076 private:
00077     I2C _i2c;
00078 
00079     /**
00080      * Set the device in active mode
00081      */
00082     void begin( void);
00083 
00084     void RegRead( char reg, char * d, int len);
00085 
00086 };
00087 
00088 #endif