FXOS8700CQ.h

00001 /** @file FXOS8700CQ.h
00002 
00003 @ brief FXOS8700CQ Library
00004 
00005 @author Dr Craig A. Evans
00006 @brief (c) University of Leeds, Jan 2017
00007 
00008 @code
00009 
00010 #include "mbed.h"
00011 #include "FXOS8700CQ.h"
00012 
00013 // create object and specifiy pins
00014 FXOS8700CQ device(I2C_SDA,I2C_SCL);
00015 
00016 int main()
00017 {
00018     // call initialisation method
00019     device.init();
00020 
00021     while (1) {
00022         
00023         // poll the sensor and get the values, storing in a struct
00024         Data values = device.get_values();
00025         
00026         // print each struct member over serial
00027         printf("ax = %f ay = %f az = %f | mx = %f my = %f mz = %f\n"
00028                ,values.ax, values.ay, values.az
00029                ,values.mx, values.my, values.mz);
00030         
00031         wait(0.5);
00032     }
00033 }
00034 
00035 @endcode
00036 
00037 */
00038 
00039 #ifndef FXOS8700CQ_H
00040 #define FXOS8700CQ_H
00041 
00042 #include "mbed.h"
00043 
00044 // mbed API uses 8-bit addresses so need to left-shift 7-bit addresses by 1
00045 #define FXOS8700CQ_ADDR   (0x1D << 1)    // for K64F board
00046 // values from 13.2 datasheet
00047 #define FXOS8700CQ_STATUS 0x00
00048 #define FXOS8700CQ_WHO_AM_I 0x0D
00049 #define FXOS8700CQ_XYZ_DATA_CFG 0x0E
00050 #define FXOS8700CQ_CTRL_REG1 0x2A
00051 #define FXOS8700CQ_M_CTRL_REG1 0x5B
00052 #define FXOS8700CQ_M_CTRL_REG2 0x5C
00053 #define FXOS8700CQ_WHO_AM_I_VAL 0xC7
00054 #define FXOS8700CQ_READ_LEN 13
00055 
00056 #define PI 3.14159265359f
00057 #define RAD2DEG 57.2957795131f
00058 
00059 struct Data {
00060     int16_t ax;
00061     int16_t ay;
00062     int16_t az;
00063     int16_t mx;
00064     int16_t my;
00065     int16_t mz;
00066 };
00067 
00068 class FXOS8700CQ
00069 {
00070 
00071 public:
00072     FXOS8700CQ(PinName sda, PinName scl);
00073     ~FXOS8700CQ();
00074     void init();
00075     Data get_values();
00076 
00077 private:
00078     I2C* i2c;
00079 
00080     void send_byte_to_reg(char byte,char reg);
00081     char read_byte_from_reg(char reg);
00082     void read_bytes_from_reg(char reg,int number_of_bytes,char bytes[]);
00083 };
00084 
00085 #endif