www.pudn.com > DSP2812formotorcontrol.rar > speed_pr.h

/* ================================================================================= 
File name:        SPEED_PR.H  (IQ version)                  
                     
Originator:	Digital Control Systems Group 
			Texas Instruments 
 
Description:  
    Header file containing the data types, constants for the period based 
    speed measurement function. Also contains the prototypes for the  
    functions implemented in SPEED_PR.C 
===================================================================================== 
 History: 
------------------------------------------------------------------------------------- 
 04-15-2005	Version 3.20                                                  
------------------------------------------------------------------------------*/ 
#ifndef __SPEED_PR_H__ 
#define __SPEED_PR_H__ 
 
typedef struct { 
       Uint32 NewTimeStamp;  	// Variable : New 'Timestamp' corresponding to a capture event (Q0) - independently with global Q  
       Uint32 OldTimeStamp;  	// Variable : Old 'Timestamp' corresponding to a capture event (Q0) - independently with global Q  
       Uint32 TimeStamp; 	   	// Input : Current 'Timestamp' corresponding to a capture event (Q0) - independently with global Q  
       Uint32 SpeedScaler;    	// Parameter :  Scaler converting 1/N cycles to a GLOBAL_Q speed (Q0) - independently with global Q 
       int32 EventPeriod;    	// Input/Variable :  Event Period (Q0) - independently with global Q 
       int16 InputSelect;       // Input : Input selection between TimeStamp (InputSelect=0) and EventPeriod (InputSelect=1) 
       _iq Speed;             	// Output :  speed in per-unit 
       Uint32 BaseRpm;         	// Parameter : Scaler converting GLOBAL_Q speed to rpm (Q0) speed - independently with global Q 
       int32 SpeedRpm;        	// Output : speed in r.p.m. (Q0) - independently with global Q 
       void (*calc)();     	   	// Pointer to the calulation function  
       } SPEED_MEAS_CAP;       	// Data type created 
 
/*  
Note that  
         SpeedScaler = 60*f/rmp_max  
where f = CLK_freq/(128*N), N = number of teeth in sprocket 
and 128 is pre-determined prescaler of timer 2 (used by capture) 
*/ 
 
typedef SPEED_MEAS_CAP *SPEED_MEAS_CAP_handle; 
/*----------------------------------------------------------------------------- 
Default initalizer for the SPEED_MEAS_CAP object. 
-----------------------------------------------------------------------------*/                      
// SpeedScaler = 260 based on f(clk) 25 MHz, f(samping)= 16.67, 25 kHz 
// rmp_max = 1800 rpm 
 
#define SPEED_MEAS_CAP_DEFAULTS   { 0, \ 
                                    0, \ 
                                    0, \ 
                                   260, \ 
                                    0, \ 
                                    0, \ 
                                    0, \ 
                                   1800, \ 
                                    0, \ 
                                  (void (*)(Uint32))speed_prd_calc } 
 
/*------------------------------------------------------------------------------ 
Prototypes for the functions in SPEED_PR.C 
------------------------------------------------------------------------------*/ 
void speed_prd_calc(SPEED_MEAS_CAP_handle);  
 
#endif // __SPEED_PR_H__