Library for the MMA7660 triple axis accelerometer

Dependents:   Websocket_Ethernet_acc app-board-Sprint-WS-Acc app-board-Ethernet-Websocket app-board-Wifly-Websocket ... more

Revision:
0:7bc29a9ea016
Child:
1:8997a1b348dd
diff -r 000000000000 -r 7bc29a9ea016 MMA7660.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MMA7660.h	Sun Oct 14 08:02:53 2012 +0000
@@ -0,0 +1,115 @@
+#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_MODE_R      0x07
+
+class MMA7660
+{
+public:
+    /**
+    * Creates a new MMA7660 object
+    *
+    * @param sda - I2C data pin
+    * @param scl - I2C clock pin
+    * @param interrupt - Interrupt pin (default = NC)
+    */
+    MMA7660(PinName sda, PinName scl, PinName interrupt = NC);
+
+    /**
+    * 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 stores, X-Y-Z
+    */
+    void readData( int *data);
+    void readData( float *data);
+    
+    /** Get X-data
+    *
+    * @param return - X-acceleration in g's
+    */
+    float getX( void );
+    
+    /** Get Y-data
+    *
+    * @param return - Y-acceleration in g's
+    */
+    float getY( void );
+    
+    /** Get Z-data
+    *
+    * @param return - Z-acceleration in g's
+    */
+    float getZ( void );        
+
+
+private:
+
+    /**
+    * Writes data to the device, could be private, but public is handy so you can transmit directly to the MPU.
+    *
+    * @param adress - register address to write to
+    * @param data - data to write
+    */
+    void write( char address, char data);
+
+    /**
+    * Read data from the device, could be private, but public is handy so you can transmit directly to the MPU.
+    *
+    * @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;
+    PinName _interrupt;
+    float samplerate;
+};
+
+
+#endif