f281xbdcpwm.c

TI公司28系列DSP控制无刷直流电机

/* ==================================================================================
File name:       F281XBDCPWM.C
                    
Originator:	Digital Control Systems Group
			Texas Instruments

Description:   This file contains source for the PWM drivers for the F281x for DC-motor
 
    dc-bus+ ------------------------
                |                  |
               [1]                [3]
                |----(dc-motor)----|
               [2]                [4]
                |                  |
    dc-bus- ------------------------

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

#include "DSP281x_Device.h"
#include "f281xbdcpwm.h"

void F281X_EV1_BDC_PWM_Init(PWMGEN *p) 
{       

        EvaRegs.T1PR = p->PeriodMax;           // Init Timer 1 period Register
        EvaRegs.T1CON.all = BDCPWM_INIT_STATE;  // Init PWM Operation
        EvaRegs.ACTRA.all = 0x0000;             // Init ACTRA Register 
        EvaRegs.GPTCONA.all = 0x0000;           // Init GPTCONA Register
        EvaRegs.COMCONA.all = 0xA200;           // Init COMCONA Register
 
        EALLOW;                       // Enable EALLOW
        GpioMuxRegs.GPAMUX.all |= 0x000F;  // Setting PWM1-4 as primary output pins
        EDIS;                         // Disable EALLOW

}


void F281X_EV1_BDC_PWM_Update(PWMGEN *p) 
{       

	int32 Tmp;
	int16 Period, GPR0_BDC_PWM;

// PWM1&4 are enabled (PWM4's forced ON) and PWM2&3 are disabled
	if (p->Rotation==0)
      EvaRegs.ACTRA.all = 0x00C2;

// PWM2&3 are enabled (PWM2's forced ON) and PWM1&4 are disabled
    else if (p->Rotation==1)  
      EvaRegs.ACTRA.all = 0x002C;

// Otherwise, PWM1-4 are disabled
    else   
      EvaRegs.ACTRA.all = 0x0000;

// Convert "Period" (Q15) modulation function to Q0
    Tmp = (int32)p->PeriodMax*(int32)p->MfuncPeriod;   // Q15 = Q0*Q15
    Period = (int16)(Tmp>>15);                           // Q15 -> Q0 (period)

// Check pwm_active setting
	if (p->PwmActive==1)                   // PWM active high
      GPR0_BDC_PWM = 0x7FFF - p->DutyFunc;   
    
    else if (p->PwmActive==0)              // PWM active low
      GPR0_BDC_PWM = p->DutyFunc;

// Convert "DutyFunc" or "GPR0_BDC_PWM" (Q15) duty modulation function to Q0
    Tmp = (int32)Period*(int32)GPR0_BDC_PWM;   // Q15 = Q0*Q15

    EvaRegs.CMPR1 = (int16)(Tmp>>15);            // Q15 -> Q0
    EvaRegs.CMPR2 = (int16)(Tmp>>15);            // Q15 -> Q0
        
}