f280xpwmdac.c

DSP280X芯片的编程简单例子

/* ==================================================================================
File name:       F280XPWMDAC.C
                    
Originator:	Digital Control Systems Group
			Texas Instruments

Description:   This file contains source for the Full Compare PWMDAC drivers for the F280x
               
Target: TMS320F280x family
              
=====================================================================================
History:
-------------------------------------------------------------------------------------
 04-15-2005	Version 3.20: Using DSP280x v. 1.10 or higher 
------------------------------------------------------------------------------------*/

#include "DSP280x_Device.h"
#include "f280xpwmdac.h"

void F280X_PWMDAC_Init(PWMDAC *p) 
{       

         // Setup Sync
         EPwm1Regs.TBCTL.bit.SYNCOSEL = 0;          // Pass through
         EPwm2Regs.TBCTL.bit.SYNCOSEL = 0;          // Pass through
         EPwm3Regs.TBCTL.bit.SYNCOSEL = 0;          // Pass through
         EPwm4Regs.TBCTL.bit.SYNCOSEL = 0;          // Pass through
         EPwm5Regs.TBCTL.bit.SYNCOSEL = 0;          // Pass through
         EPwm6Regs.TBCTL.bit.SYNCOSEL = 0;          // Pass through

         // Allow each timer to be sync'ed
         EPwm1Regs.TBCTL.bit.PHSEN = 1;
         EPwm2Regs.TBCTL.bit.PHSEN = 1;
         EPwm3Regs.TBCTL.bit.PHSEN = 1;
         EPwm4Regs.TBCTL.bit.PHSEN = 1;
         EPwm5Regs.TBCTL.bit.PHSEN = 1;
         EPwm6Regs.TBCTL.bit.PHSEN = 1;

         // Init Timer-Base Period Register for EPWM4-EPWM6
         EPwm4Regs.TBPRD = p->PeriodMax;
         EPwm5Regs.TBPRD = p->PeriodMax;
         EPwm6Regs.TBPRD = p->PeriodMax;

         // Init Timer-Base Phase Register for EPWM4-EPWM6
         EPwm4Regs.TBPHS.half.TBPHS = 0;
         EPwm5Regs.TBPHS.half.TBPHS = 0;
         EPwm6Regs.TBPHS.half.TBPHS = 0;

         // Init Timer-Base Control Register for EPWM4-EPWM6
         EPwm4Regs.TBCTL.all = PWMDAC_INIT_STATE;
         EPwm5Regs.TBCTL.all = PWMDAC_INIT_STATE;
         EPwm6Regs.TBCTL.all = PWMDAC_INIT_STATE;

         // Init Compare Control Register for EPWM4-EPWM6
         EPwm4Regs.CMPCTL.all = PWMDAC_CMPCTL_INIT_STATE;
         EPwm5Regs.CMPCTL.all = PWMDAC_CMPCTL_INIT_STATE;
         EPwm6Regs.CMPCTL.all = PWMDAC_CMPCTL_INIT_STATE;

         // Init Action Qualifier Output A Register for EPWM4-EPWM6
         EPwm4Regs.AQCTLA.all = PWMDAC_AQCTLA_INIT_STATE;
         EPwm5Regs.AQCTLA.all = PWMDAC_AQCTLA_INIT_STATE;
         EPwm6Regs.AQCTLA.all = PWMDAC_AQCTLA_INIT_STATE;

         // Init Dead-Band Generator Control Register for EPWM4-EPWM6
         EPwm4Regs.DBCTL.all = PWMDAC_DBCTL_INIT_STATE;
         EPwm5Regs.DBCTL.all = PWMDAC_DBCTL_INIT_STATE;
         EPwm6Regs.DBCTL.all = PWMDAC_DBCTL_INIT_STATE;

         // Init Dead-Band Generator Falling/Rising Edge Delay Register for EPWM4-EPWM6
         EPwm4Regs.DBFED = PWMDAC_DBCNT_INIT_STATE;
         EPwm4Regs.DBRED = PWMDAC_DBCNT_INIT_STATE;
         EPwm5Regs.DBFED = PWMDAC_DBCNT_INIT_STATE;
         EPwm5Regs.DBRED = PWMDAC_DBCNT_INIT_STATE;
         EPwm6Regs.DBFED = PWMDAC_DBCNT_INIT_STATE;
         EPwm6Regs.DBRED = PWMDAC_DBCNT_INIT_STATE;

         // Init PWM Chopper Control Register for EPWM4-EPWM6
         EPwm4Regs.PCCTL.all = PWMDAC_PCCTL_INIT_STATE;
         EPwm5Regs.PCCTL.all = PWMDAC_PCCTL_INIT_STATE;
         EPwm6Regs.PCCTL.all = PWMDAC_PCCTL_INIT_STATE;
 
         EALLOW;                       // Enable EALLOW 

         // Init Trip Zone Select Register
         EPwm4Regs.TZSEL.all = PWMDAC_TZSEL_INIT_STATE;
         EPwm5Regs.TZSEL.all = PWMDAC_TZSEL_INIT_STATE;
         EPwm6Regs.TZSEL.all = PWMDAC_TZSEL_INIT_STATE;

         // Init Trip Zone Control Register
         EPwm4Regs.TZCTL.all = PWMDAC_TZCTL_INIT_STATE;
         EPwm5Regs.TZCTL.all = PWMDAC_TZCTL_INIT_STATE;
         EPwm6Regs.TZCTL.all = PWMDAC_TZCTL_INIT_STATE;

         // Setting six EPWM as primary output pins
         GpioCtrlRegs.GPAMUX1.bit.GPIO6 = 1;   // EPWM4A pin
         GpioCtrlRegs.GPAMUX1.bit.GPIO7 = 1;   // EPWM4B pin
         GpioCtrlRegs.GPAMUX1.bit.GPIO8 = 1;   // EPWM5A pin
         GpioCtrlRegs.GPAMUX1.bit.GPIO9 = 1;   // EPWM5B pin
         GpioCtrlRegs.GPAMUX1.bit.GPIO10 = 1;  // EPWM6A pin
         GpioCtrlRegs.GPAMUX1.bit.GPIO11 = 1;  // EPWM6B pin

         EDIS;                         // Disable EALLOW

}

void F280X_PWMDAC_Update(PWMDAC *p) 
{       
        int32 Tmp;

// Update Timer-Base period Registers
        EPwm4Regs.TBPRD = p->PeriodMax;  
        EPwm5Regs.TBPRD = p->PeriodMax;  
        EPwm6Regs.TBPRD = p->PeriodMax;  

// Compute the compare A (Q0) from the EPWM4 A&B duty cycle ratio (Q15)
        Tmp = (int32)p->PeriodMax*(int32)(*p->PwmDacInPointer0);      // Q15 = Q0*Q15
        EPwm4Regs.CMPA.half.CMPA = (int16)(Tmp>>16) + (int16)(p->PeriodMax>>1); // Q0 = (Q15->Q0)/2 + (Q0/2)

// Compute the compare A (Q0) from the EPWM5 A&B duty cycle ratio (Q15)
        Tmp = (int32)p->PeriodMax*(int32)(*p->PwmDacInPointer1);      // Q15 = Q0*Q15
        EPwm5Regs.CMPA.half.CMPA = (int16)(Tmp>>16) + (int16)(p->PeriodMax>>1);  // Q0 = (Q15->Q0)/2 + (Q0/2)

// Compute the compare A (Q0) from the EPWM6 A&B duty cycle ratio (Q15)
        Tmp = (int32)p->PeriodMax*(int32)(*p->PwmDacInPointer2);      // Q15 = Q0*Q15
        EPwm6Regs.CMPA.half.CMPA = (int16)(Tmp>>16) + (int16)(p->PeriodMax>>1);  // Q0 = (Q15->Q0)/2 + (Q0/2)

}