Peripheral's Declaration, Definition and Call with Embedded C

Other Parts Discussed in Thread: CONTROLSUITE

Hi,

I start to use TI CCS to program for peripheral with embedded C. I use park.h and park.c as an example and paste park.h below. In park.h, why it needs define  __PARK_H__, typedef struct PARK, PARK_DEFAULTS, and function void park_calc(PARK_handle)? In park.c, it calculates and updates void park_calc(PARK *v). In the main ISR, it calls park1.calc(&park1).

park.h                                                                                                                                                                                                                                                                                                    #ifndef __PARK_H__
#define __PARK_H__

typedef struct {  _iq  Alpha;    // Input: stationary d-axis stator variable
      _iq  Beta;   // Input: stationary q-axis stator variable
      _iq  Angle;  // Input: rotating angle (pu)
      _iq  Ds;   // Output: rotating d-axis stator variable
      _iq  Qs;   // Output: rotating q-axis stator variable
        void  (*calc)(); // Pointer to calculation function
     } PARK;            
#define PARK_DEFAULTS {  0, \
                          0, \
                          0, \
                          0, \
                          0, \
                   (void (*)(Uint32))park_calc }

void park_calc(PARK_handle);

Thank you,