accelerometer
Dependents: embedded_answ_2 embedded_answ_2_
Diff: MMA7660.h
- Revision:
- 0:7bc29a9ea016
- Child:
- 1:8997a1b348dd
--- /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