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/* Copyright (c) <year> <copyright holders>, MIT License
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "mbed.h"
#ifndef MMA7660_H
#define MMA7660_H
#define MMA7660_ADDRESS 0x98
#define MMA7660_SENSITIVITY 21.33
#define MMA7660_XOUT_R 0x00
#define MMA7660_YOUT_R 0x01
#define MMA7660_ZOUT_R 0x02
#define MMA7660_TILT_R 0x03
#define MMA7660_INT_R 0x06
#define MMA7660_MODE_R 0x07
#define MMA7660_SR_R 0x08
/** An interface for the MMA7660 triple axis accelerometer
*
* @code
* //Uses the measured z-acceleration to drive leds 2 and 3 of the mbed
*
* #include "mbed.h"
* #include "MMA7660.h"
*
* MMA7660 MMA(p28, p27);
*
* DigitalOut connectionLed(LED1);
* PwmOut Zaxis_p(LED2);
* PwmOut Zaxis_n(LED3);
*
* int main() {
* if (MMA.testConnection())
* connectionLed = 1;
*
* while(1) {
* Zaxis_p = MMA.z();
* Zaxis_n = -MMA.z();
* }
*
* }
* @endcode
*/
class MMA7660
{
public:
/**
* The 6 different orientations and unknown
*
* Up & Down = X-axis
* Right & Left = Y-axis
* Back & Front = Z-axis
*
*/
enum Orientation {Up, Down,
Right, Left,
Back, Front,
Unknown
};
/**
* Creates a new MMA7660 object
*
* @param sda - I2C data pin
* @param scl - I2C clock pin
* @param active - true (default) to enable the device, false to keep it standby
*/
MMA7660(PinName sda, PinName scl, bool active = true);
/**
* Tests if communication is possible with the MMA7660
*
* Because the MMA7660 lacks a WHO_AM_I register, this function can only check
* if there is an I2C device that responds to the MMA7660 address
*
* @param return - true for successfull connection, false for no connection
*/
bool testConnection( void );
/**
* Sets the active state of the MMA7660
*
* Note: This is unrelated to awake/sleep mode
*
* @param state - true for active, false for standby
*/
void setActive( bool state);
/**
* Reads acceleration data from the sensor
*
* When the parameter is a pointer to an integer array it will be the raw data.
* When it is a pointer to a float array it will be the acceleration in g's
*
* @param data - pointer to array with length 3 where the acceleration data will be stored, X-Y-Z
*/
void readData( int *data);
void readData( float *data);
/**
* Get X-data
*
* @param return - X-acceleration in g's
*/
float x( void );
/**
* Get Y-data
*
* @param return - Y-acceleration in g's
*/
float y( void );
/**
* Get Z-data
*
* @param return - Z-acceleration in g's
*/
float z( void );
/**
* Sets the active samplerate
*
* The entered samplerate will be rounded to nearest supported samplerate.
* Supported samplerates are: 120 - 64 - 32 - 16 - 8 - 4 - 2 - 1 samples/second.
*
* @param samplerate - the samplerate that will be set
*/
void setSampleRate(int samplerate);
/**
* Returns if it is on its front, back, or unknown side
*
* This is read from MMA7760s registers, page 12 of datasheet
*
* @param return - Front, Back or Unknown orientation
*/
Orientation getSide( void );
/**
* Returns if it is on it left, right, down or up side
*
* This is read from MMA7760s registers, page 12 of datasheet
*
* @param return - Left, Right, Down, Up or Unknown orientation
*/
Orientation getOrientation ( void );
private:
/**
* Writes data to the device
*
* @param adress - register address to write to
* @param data - data to write
*/
void write( char address, char data);
/**
* Read data from the device
*
* @param adress - register address to write to
* @return - data from the register specified by RA
*/
char read( char adress);
/**
* Read multiple regigsters from the device, more efficient than using multiple normal reads.
*
* @param adress - register address to write to
* @param length - number of bytes to read
* @param data - pointer where the data needs to be written to
*/
void read( char adress, char *data, int length);
/**
* Reads single axis
*/
float getSingle(int number);
I2C _i2c;
bool active;
float samplerate;
};
#endif
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