Diff: FXOS8700CQ.h

Revision:

0:cf6299acfe98

Child:

1:3ec7e2676e48

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FXOS8700CQ.h	Wed May 28 13:28:18 2014 +0000
@@ -0,0 +1,87 @@
+#ifndef FXOS8700CQ_H
+#define FXOS8700CQ_H
+
+#include "mbed.h" // Building this for the mbed platform
+
+#define I2C_400K 400000
+
+// FXOS8700CQ I2C address
+#define FXOS8700CQ_SLAVE_ADDR0 (0x1E<<1) // with pins SA0=0, SA1=0
+#define FXOS8700CQ_SLAVE_ADDR1 (0x1D<<1) // with pins SA0=1, SA1=0
+#define FXOS8700CQ_SLAVE_ADDR2 (0x1C<<1) // with pins SA0=0, SA1=1
+#define FXOS8700CQ_SLAVE_ADDR3 (0x1F<<1) // with pins SA0=1, SA1=1
+
+// FXOS8700CQ internal register addresses
+#define FXOS8700CQ_STATUS 0x00
+#define FXOS8700CQ_OUT_X_MSB 0x01
+#define FXOS8700CQ_WHOAMI 0x0D
+#define FXOS8700CQ_XYZ_DATA_CFG 0x0E
+#define FXOS8700CQ_CTRL_REG1 0x2A
+#define FXOS8700CQ_CTRL_REG2 0x2B
+#define FXOS8700CQ_CTRL_REG3 0x2C
+#define FXOS8700CQ_CTRL_REG4 0x2D
+#define FXOS8700CQ_CTRL_REG5 0x2E
+
+#define FXOS8700CQ_M_OUT_X_MSB 0x34
+
+#define FXOS8700CQ_M_CTRL_REG1 0x5B
+#define FXOS8700CQ_M_CTRL_REG2 0x5C
+#define FXOS8700CQ_M_CTRL_REG3 0x5D
+
+// FXOS8700CQ WHOAMI production register value
+#define FXOS8700CQ_WHOAMI_VAL 0xC7
+
+// 6 channels of two bytes = 12 bytes; read from FXOS8700CQ_OUT_X_MSB
+#define FXOS8700CQ_READ_LEN 12
+
+// From mbed I2C documentation for complete read/write transactions
+#define I2C_SUCCESS 0
+#define I2C_FAILURE 1
+
+// For processing the accelerometer data to right-justified 2's complement
+#define UINT14_MAX 16383
+
+// TODO: struct to hold the data out of the sensor
+typedef struct {
+    int16_t x;
+    int16_t y;
+    int16_t z;
+} SRAWDATA;
+
+class FXOS8700CQ
+{
+public:
+    /**
+    * FXOS8700CQ constructor
+    *
+    * @param sda SDA pin
+    * @param sdl SCL pin
+    * @param addr address of the I2C peripheral in (7-bit << 1) form
+    */
+
+    FXOS8700CQ(PinName sda, PinName scl, int addr);
+
+    /**
+    * FXOS8700CQ destructor
+    */
+    ~FXOS8700CQ();
+
+    void enable(void);
+    void disable(void);
+    uint8_t get_whoami(void);
+    uint8_t status(void);
+    void get_data(SRAWDATA *accel_data, SRAWDATA *magn_data);
+
+
+
+private:
+    I2C dev_i2c; // instance of the mbed I2C class
+    uint8_t dev_addr; // Device I2C address, in (7-bit << 1) form
+
+    // I2C helper methods
+    void read_regs(int reg_addr, uint8_t* data, int len);
+    void write_regs(uint8_t* data, int len);
+
+};
+
+#endif