f281xpwm_res.c

TI公司28系列DSP控制无刷直流电机

/* ==================================================================================
File name:       F281XPWM_RES.C
                    
Originator:	Digital Control Systems Group
			Texas Instruments

Description:   This file contains source for the Resolver driver for the F281x

Target: TMS320F281x family
       
=====================================================================================
History:
-------------------------------------------------------------------------------------
 04-15-2005	Version 3.20: Using DSP281x v. 1.00 or higher 
----------------------------------------------------------------------------------*/

#include "DSP281x_Device.h"
#include "f281xpwm_res.h"

void F281X_EV2_Resolver_PWM_Init(RESOLVER_PWM *p) 
{       

        // Initialize PWM7/PWM8 (EVB)
        EvbRegs.T3PR = p->PeriodMax;                   // Init Timer 3 period Register
        EvbRegs.T3CON.all = PWM_RESOLVER_INIT_STATE;   // Symmetrical Operation
        EvbRegs.COMCONB.all = 0xA200;                  // Init COMCONB Register
        
        EvbRegs.ACTRB.all = ACTRB_PWM_RESOLVER_INIT_STATE; // Init ACTRB Register                

        EALLOW;                       // Enable EALLOW 
        GpioMuxRegs.GPBMUX.all |= 0x0003;   // Setting PWM7-8 as primary output pins
        EDIS;                         // Disable EALLOW

}

void F281X_EV2_Resolver_PWM_Update(RESOLVER_PWM *p) 
{       
        int32 Tmp;

        EvbRegs.T3PR = p->PeriodMax;        // Update Timer 3 period Register

// Compute the compare 4 (Q0) from the PWM 7&8 duty cycle ratio (Q15)
        Tmp = (int32)p->PeriodMax*(int32)p->RefSignal;                // Q15 = Q0*Q15
        EvbRegs.CMPR4 = (int16)(Tmp>>16) + (int16)(p->PeriodMax>>1);  // Q0 = (Q15->Q0)/2 + (Q0/2)

}