[参考译文] TMS320F28069：使用内部比较器进行峰值电流控制。 比较器设置不工作

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1132939/tms320f28069-using-internal-comp-for-peak-current-control-comparator-setup-not-working

你好。 我想设置4个 PWM、并让其中两个 PWM (PWM1A/B)根据模拟测量被内部比较器1强制为低电平。 我的设置有问题。 PWM 正常工作、但模拟测量不影响 PWM1A/B、所以我的比较器设置可能是错误的。 可以帮帮我吗？

#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File

//
// Function Prototypes
//
void InitEPwm1Example(void);
void InitEPwm2Example(void);
void InitEPwm3Example(void);
__interrupt void epwm1_isr(void);
__interrupt void epwm2_isr(void);
__interrupt void epwm3_isr(void);

//
// Globals
//
Uint32  EPwm1TimerIntCount;
Uint32  EPwm2TimerIntCount;
Uint32  EPwm3TimerIntCount;
Uint16  EPwm1_DB_Direction;
Uint16  EPwm2_DB_Direction;
Uint16  EPwm3_DB_Direction;

//
// Defines that Maximum Dead Band values
//
#define EPWM1_MAX_DB   0x0002
#define EPWM2_MAX_DB   0x0002
#define EPWM3_MAX_DB   0x0002

#define EPWM1_MIN_DB   0
#define EPWM2_MIN_DB   0
#define EPWM3_MIN_DB   0

//
// Defines to keep track of which way the Dead Band is moving
//
#define DB_UP   1
#define DB_DOWN 0

//
// Main
//
void main(void)
{
    //
    // Step 1. Initialize System Control:
    // PLL, WatchDog, enable Peripheral Clocks
    // This example function is found in the F2806x_SysCtrl.c file.
    //
    InitSysCtrl();

    //
    // Step 2. Initalize GPIO: 
    // This example function is found in the F2806x_Gpio.c file and
    // illustrates how to set the GPIO to it's default state.
    //
    // InitGpio();  // Skipped for this example  

    //
    // For this case just init GPIO pins for ePWM1, ePWM2, ePWM3
    // These functions are in the F2806x_EPwm.c file

    EALLOW;
       SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1;     // Enable Clock to the ADC

       //
       // Comparator shares the internal BG reference of the ADC, must be powered
       // even if ADC is unused
       //
       AdcRegs.ADCCTL1.bit.ADCBGPWD = 1;

       DELAY_US(1000);							  // Delay for Power Up

       //
       // Enable clock to the Comparator 1 block
       //
       SysCtrlRegs.PCLKCR3.bit.COMP1ENCLK = 1;

       Comp1Regs.COMPCTL.bit.COMPDACEN = 1;      // Power up Comparator 1 locally

       // Connect the inverting input to the internal DAC
       //
       Comp1Regs.COMPCTL.bit.COMPSOURCE = 0;
       Comp1Regs.DACVAL.bit.DACVAL = 512;	    // Set DAC output to midpoint
       //
       SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;
       EDIS;





    //
    InitEPwm1Gpio();
    InitEPwm2Gpio();
    InitEPwm3Gpio();

    EALLOW;
    SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
    EDIS;

    //
    // Step 3. Clear all interrupts and initialize PIE vector table:
    // Disable CPU interrupts 
    //
    DINT;

    //
    // Initialize the PIE control registers to their default state.
    // The default state is all PIE interrupts disabled and flags
    // are cleared.  
    // This function is found in the F2806x_PieCtrl.c file.
    //
    InitPieCtrl();

    //
    // Disable CPU interrupts and clear all CPU interrupt flags
    //
    IER = 0x0000;
    IFR = 0x0000;

    //
    // Initialize the PIE vector table with pointers to the shell Interrupt 
    // Service Routines (ISR).  
    // This will populate the entire table, even if the interrupt
    // is not used in this example.  This is useful for debug purposes.
    // The shell ISR routines are found in F2806x_DefaultIsr.c.
    // This function is found in F2806x_PieVect.c.
    //
    InitPieVectTable();

    //
    // Interrupts that are used in this example are re-mapped to
    // ISR functions found within this file.
    //
    EALLOW;  // This is needed to write to EALLOW protected registers
    PieVectTable.EPWM1_INT = &epwm1_isr;
    PieVectTable.EPWM2_INT = &epwm2_isr;
    PieVectTable.EPWM3_INT = &epwm3_isr;      
    EDIS;    // This is needed to disable write to EALLOW protected registers

    //
    // Step 4. Initialize all the Device Peripherals:
    // This function is found in F2806x_InitPeripherals.c
    //
    // InitPeripherals();  // Not required for this example

    EALLOW;
    SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;
    EDIS;

    InitEPwm1Example();    
    InitEPwm2Example();
    InitEPwm3Example();

    EALLOW;
    SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
    EDIS;

    //
    // Step 5. User specific code, enable interrupts
    // Initalize counters:
    //
    EPwm1TimerIntCount = 0;
    EPwm2TimerIntCount = 0;
    EPwm3TimerIntCount = 0;

    //
    // Enable CPU INT3 which is connected to EPWM1-3 INT
    //
    IER |= M_INT3;

    //
    // Enable EPWM INTn in the PIE: Group 3 interrupt 1-3
    //
    PieCtrlRegs.PIEIER3.bit.INTx1 = 1;
    PieCtrlRegs.PIEIER3.bit.INTx2 = 1;
    PieCtrlRegs.PIEIER3.bit.INTx3 = 1;

    //
    // Enable global Interrupts and higher priority real-time debug events
    //
    EINT;   // Enable Global interrupt INTM
    ERTM;   // Enable Global realtime interrupt DBGM

    //
    // Step 6. IDLE loop. Just sit and loop forever (optional)
    //
    for(;;)
    {
        __asm("          NOP");
    }
} 

//
// epwm1_isr -
//
__interrupt void
epwm1_isr(void)
{
    EPwm1TimerIntCount++;

    //
    // Clear INT flag for this timer
    //
    EPwm1Regs.ETCLR.bit.INT = 1;

    //
    // Acknowledge this interrupt to receive more interrupts from group 3
    //
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
}

//
// epwm2_isr -
//
__interrupt void
epwm2_isr(void)
{

    EPwm2TimerIntCount++;

    //
    // Clear INT flag for this timer
    //
    EPwm2Regs.ETCLR.bit.INT = 1;

    //
    // Acknowledge this interrupt to receive more interrupts from group 3
    //
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
}

//
// epwm3_isr -
//
__interrupt void
epwm3_isr(void)
{
   

    EPwm3TimerIntCount++;

    //
    // Clear INT flag for this timer
    //
    EPwm3Regs.ETCLR.bit.INT = 1;

    //
    // Acknowledge this interrupt to receive more interrupts from group 3
    //
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
}

//
// InitEPwm1Example -
//
void
InitEPwm1Example()
{   
    EPwm1Regs.TBPRD = 30;                        // Set timer period
    EPwm1Regs.TBPHS.half.TBPHS = 0x0000;           // Phase is 0
    EPwm1Regs.TBCTR = 0x0000;                      // Clear counter

    //
    // Setup TBCLK
    //
    EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up
    EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;        // Disable phase loading
    EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV4;       // Clock ratio to SYSCLKOUT
    EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV4;

    EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;    // Load registers every ZERO
    EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
    EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
    EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;   

    //
    // Setup compare
    //
    EPwm1Regs.CMPA.half.CMPA = 15;

    //
    // Set actions
    //
    EPwm1Regs.AQCTLA.bit.ZRO = AQ_SET;           // Set PWM1A on CAU
    EPwm1Regs.AQCTLA.bit.PRD = AQ_CLEAR;		 // Clear PWM1A on CAD

    EPwm1Regs.AQCTLB.bit.ZRO = AQ_CLEAR;         // Clear PWM1B on CAU
    EPwm1Regs.AQCTLB.bit.PRD = AQ_SET;           // Set PWM1B on CAD

    //
  
    //
    EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; // 0x3
    EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC;      // 0x2
    EPwm1Regs.DBCTL.bit.IN_MODE = DBA_ALL;         // 0x0
    EPwm1Regs.DBRED = EPWM2_MAX_DB;
    EPwm1Regs.DBFED = EPWM2_MAX_DB;
    EPwm1_DB_Direction = DB_UP;

    //
  
    //
    EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO;     // Select INT on Zero event
    //EPwm2Regs.ETSEL.bit.INTEN = 1;                // Enable INT
    EPwm1Regs.ETPS.bit.INTPRD = ET_3RD;           // Generate INT on 3rd event


    //----------------------------------------------- 
    

    EPwm1Regs.DCTRIPSEL.bit.DCAHCOMPSEL = DC_COMP1OUT; // DCAH = Comparator 1 output
    EPwm1Regs.DCTRIPSEL.bit.DCBHCOMPSEL = DC_COMP1OUT;

    EPwm1Regs.TZDCSEL.bit.DCAEVT2 = TZ_DCAH_HI; // DCAEVT2 = DCAH high(will become active
    EPwm1Regs.TZDCSEL.bit.DCBEVT2 = TZ_DCBH_HI; // DCAEVT2 = DCAH high(will become active
    // as Comparator output goes high)
    EPwm1Regs.DCACTL.bit.EVT2SRCSEL = DC_EVT2; // DCAEVT2 = DCAEVT2 (not filtered)
    EPwm1Regs.DCACTL.bit.EVT2FRCSYNCSEL = DC_EVT_ASYNC; // Take async path // Enable DCAEVT2 as a

    EPwm1Regs.DCBCTL.bit.EVT2SRCSEL = DC_EVT2; // DCAEVT2 = DCAEVT2 (not filtered)
    EPwm1Regs.DCBCTL.bit.EVT2FRCSYNCSEL = DC_EVT_ASYNC; // Take async path // Enable DCAEVT2 as a
    // one-shot trip source
    // Note: DCxEVT1 events can be defined as
    // one-shot.
    // DCxEVT2 events can be defined as
    // cycle-by-cycle.
    EPwm1Regs.TZSEL.bit.DCAEVT2 = 1; // What do we want the DCAEVT1 and DCBEVT1
    EPwm1Regs.TZSEL.bit.DCBEVT2 = 1; // What do we want the DCAEVT1 and DCBEVT1
    // events to do?
    // DCAEVTx events can force EPWMxA
    // DCBEVTx events can force EPWMxB
    EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_LO; // EPWM1A will go low
    EPwm1Regs.TZCTL.bit.TZB = TZ_FORCE_LO; // EPWM1A will go low


}

//
// InitEPwm2Example -
//
void
InitEPwm2Example()
{
    EPwm2Regs.TBPRD = 30;                         // Set timer period
    EPwm2Regs.TBPHS.half.TBPHS = 0x0000;            // Phase is 0
    EPwm2Regs.TBCTR = 0x0000;                       // Clear counter

    //
    // Setup TBCLK
    //
    EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up
    EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE;        // Disable phase loading
    EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV4;       // Clock ratio to SYSCLKOUT
    
    //
    // Slow so we can observe on the scope
    //
    EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV4;

    //
    // Setup compare 
    //
    EPwm2Regs.CMPA.half.CMPA = 15;

    //
    // Set actions
    //
    EPwm2Regs.AQCTLA.bit.CAU = AQ_SET;              // Set PWM3A on CAU
    EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR;            // Clear PWM3A on CAD

    EPwm2Regs.AQCTLB.bit.CAU = AQ_CLEAR;            // Clear PWM3B on CAU
    EPwm2Regs.AQCTLB.bit.CAD = AQ_SET;              // Set PWM3B on CAD

    //
    // Active high complementary PWMs - Setup the deadband
    //
    EPwm2Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; // 0x3
    EPwm2Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC;      // 0x2
    EPwm2Regs.DBCTL.bit.IN_MODE = DBA_ALL;         // 0x0
    EPwm2Regs.DBRED = EPWM2_MAX_DB;
    EPwm2Regs.DBFED = EPWM2_MAX_DB;
    EPwm2_DB_Direction = DB_UP;

    //
    // Interrupt where we will change the deadband
    //
    EPwm2Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO;     // Select INT on Zero event
    //EPwm2Regs.ETSEL.bit.INTEN = 1;                // Enable INT
    EPwm2Regs.ETPS.bit.INTPRD = ET_3RD;           // Generate INT on 3rd event
}

//
// InitEPwm3Example -
//
void
InitEPwm3Example()
{
    EPwm3Regs.TBPRD = 6000;                         // Set timer period
    EPwm3Regs.TBPHS.half.TBPHS = 0x0000;            // Phase is 0
    EPwm3Regs.TBCTR = 0x0000;                       // Clear counter

    //
    // Setup TBCLK
    //
    EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up
    EPwm3Regs.TBCTL.bit.PHSEN = TB_DISABLE;        // Disable phase loading
    EPwm3Regs.TBCTL.bit.HSPCLKDIV = TB_DIV4;       // Clock ratio to SYSCLKOUT
    
    //
    // Slow so we can observe on the scope
    //
    EPwm3Regs.TBCTL.bit.CLKDIV = TB_DIV4;

    //
    // Setup compare 
    //
    EPwm3Regs.CMPA.half.CMPA = 3000;

    //
    // Set actions
    //
    EPwm3Regs.AQCTLA.bit.CAU = AQ_SET;              // Set PWM3A on CAU
    EPwm3Regs.AQCTLA.bit.CAD = AQ_CLEAR;            // Clear PWM3A on CAD

    EPwm3Regs.AQCTLB.bit.CAU = AQ_CLEAR;            // Clear PWM3B on CAU
    EPwm3Regs.AQCTLB.bit.CAD = AQ_SET;              // Set PWM3B on CAD

    //
    // Active high complementary PWMs - Setup the deadband
    //
    EPwm3Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; // 0x3
    EPwm3Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC;      // 0x2
    EPwm3Regs.DBCTL.bit.IN_MODE = DBA_ALL;         // 0x0
    EPwm3Regs.DBRED = EPWM3_MIN_DB;
    EPwm3Regs.DBFED = EPWM3_MIN_DB;
    EPwm3_DB_Direction = DB_UP;

    //
    // Interrupt where we will change the deadband
    //
    EPwm3Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO;     // Select INT on Zero event
    EPwm3Regs.ETSEL.bit.INTEN = 1;                // Enable INT
    EPwm3Regs.ETPS.bit.INTPRD = ET_3RD;           // Generate INT on 3rd event   
}