Igor Skochinsky / Mbed 2 deprecated DCSS504

A class and a demo program to use with the DC-SS504 board from SureElectronics which uses MMC2120MG magnetometer from Memsic. The program glows leds depending on the direction it is turned to.

Dependencies:   mbed

MMCx12xM.h@0:a44429321af8, 2009-12-02 (annotated)

Committer:
igorsk
Date:
Wed Dec 02 23:03:25 2009 +0000
Revision:
0:a44429321af8

        

        
Who changed what in which revision?

        

            
                
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#include <mbed.h>





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#ifndef __MMCx12xM__





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#define __MMCx12xM__





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// possible I2C addresses, depending on the chip number





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enum





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{





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  MMCx120M = 0x60,





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  MMCx121M = 0x64,





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  MMCx122M = 0x68,





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  MMCx123M = 0x6C,





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};





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/* Class: MMCx12xM





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 *  Control a Memsic MMC212xM magnetometer over I2C





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 *





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 * Example:





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 * > // MMC2120M at address 0x60





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 * >





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 * > #include "mbed.h"





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 * >





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 * > I2C i2c(p28, p27);





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 * > MMC212xM memsic1(i2c);





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 * >





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 * > int main() {





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 * >     int data[2];





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 * >     memsic1.read_raw_values(data, 2);





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 * > }





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 */





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class MMCx12xM : public Base





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{





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public:





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    // constructor in case you already have an I2C bus instance





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    MMCx12xM(I2C &i2c, int address = MMCx120M, const char *name = NULL);





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    // use this constructor if the sensor is the only device on the bus 





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    MMCx12xM(PinName sda, PinName scl, int address = MMCx120M, const char *name = NULL);





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    // send a SET coil command





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    bool coil_set();





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    // send a RESET coil command





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    bool coil_reset();





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    // read raw (12-bit) axis values





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    bool read_raw_values(int *values, int count = 2);





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    // start calibration





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    void calibrate_begin();





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    // take a single measurement for calibration





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    void calibrate_step(int count = 2);





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    // finish calibration and calculate offset and sensitivity values





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    void calibrate_end();





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    // read calibrated (-1.0 .. +1.0) axis values





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    bool read_values(float *values, int count = 2);





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    virtual ~MMCx12xM();





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private:





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    bool _send_command(int command);





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    bool _wait_ready(int command);





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    bool _read_axis(int *value, int index = -1);





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    // reference to the I2C bus





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    I2C *_I2C;





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    // sensor slave address





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    int _addr;





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    // did we create the bus instance? (i.e. we should delete it on destruct)





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    bool _own_i2c;





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    // calibration values





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    int _sensitivity[3];





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    int _offset[3];





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    // temporaries for calibration





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    int _maxvals[3];





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    int _minvals[3];





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};





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#endif