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#ifndef _MM3_H
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#define _MM3_H
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#include <inttypes.h>
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typedef struct
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{
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        int8_t X_off;
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        int8_t Y_off;
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        int8_t Z_off;
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        int16_t X_range;
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        int16_t Y_range;
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        int16_t Z_range;
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} MM3_calib_t;
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extern MM3_calib_t MM3_calib;
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// Initialization of the MM3 communication
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void MM3_Init(void);
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// should be called cyclic to get actual compass reading
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void MM3_Update(void);
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// this function calibrates the MM3
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// and returns immediately if the communication to the MM3-Board is broken.
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void MM3_Calibrate(void);
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// calculates the current compass heading in a range from 0 to 360 deg.
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// returns -1 of no compass data are available
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int16_t MM3_Heading(void);
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#endif //_MM3_H
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