[参考译文] TMDSCNCD28P65X：ePWM 同步

尊敬的 Manish：

您可以禁用 ePWM1的相位寄存器吗？ 如果 ePWM1是与其他 PWM 模块同步的主要模块。 另外、在调用 CpuSysRegs.PCLKCR0.bit.TBCLKSYNC 之前、您是否可以调用 GTBCLKSYNC 并将其设置为1？ 这应该有助于同步这些模块。

此致！

马瑞安

尊敬的 Manish：

这是我的代码片段、我唯一更改的是 TBPHS 值为250、因此它会产生180度的相移。

//
// Included Files
//
#include "f28x_project.h"

//
// Globals
//
typedef struct
{
    volatile struct EPWM_REGS *EPwmRegHandle;
    Uint16 EPwm_CMPA_Direction;
    Uint16 EPwm_CMPB_Direction;
    Uint16 EPwmTimerIntCount;
    Uint16 EPwmMaxCMPA;
    Uint16 EPwmMinCMPA;
    Uint16 EPwmMaxCMPB;
    Uint16 EPwmMinCMPB;
}EPWM_INFO;

EPWM_INFO epwm1_info;
EPWM_INFO epwm2_info;
EPWM_INFO epwm3_info;



//
// Main
//
void main(void)
{
//
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the f2838x_sysctrl.c file.
//
    InitSysCtrl();

//
// Step 2. Initialize GPIO:
// This example function is found in the f2838x_gpio.c file and
// illustrates how to set the GPIO to it's default state.
//
//    InitGpio();

//
// enable PWM1, PWM2 and PWM3
//
    CpuSysRegs.PCLKCR2.bit.EPWM1=1;
    CpuSysRegs.PCLKCR2.bit.EPWM2=1;
    CpuSysRegs.PCLKCR2.bit.EPWM3=1;

//
// For this case just init GPIO pins for ePWM1, ePWM2, ePWM3
// These functions are in the f2838x_epwm.c file
//
    InitEPwm1Gpio();
    InitEPwm2Gpio();
    InitEPwm3Gpio();

//
// 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 f2838x_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 f2838x_defaultisr.c.
// This function is found in f2838x_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

    EDIS;   // This is needed to disable write to EALLOW protected registers

//
// For this example, only initialize the ePWM
//
    EALLOW;
    CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 0;
    CpuSysRegs.PCLKCR0.bit.GTBCLKSYNC = 0;
    EDIS;

    EPwm1_Init();
    EPwm2_Init();

    EALLOW;
    CpuSysRegs.PCLKCR0.bit.GTBCLKSYNC = 1;
    CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 1;
    EDIS;
//
// Step 4. User specific code, enable interrupts:
//

//
// 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 5. IDLE loop. Just sit and loop forever (optional):
//
    //
    // Loop forever:
    //
    for(;;)
    {
        asm (" NOP");
        EPwm2Regs.TBPHS.bit.TBPHS = 250;
    }
}
void EPwm1_Init()
{
//
// Setup TBCLK
//
EPwm1Regs.EPWMSYNCOUTEN.bit.ZEROEN=1;
EPwm1Regs.TBCTR = 0; // Clear counter
EPwm1Regs.TBCTL.bit.CTRMODE = 2; // Count up-down
EPwm1Regs.TBPRD = 250; // Timer period for 200 kHz
EPwm1Regs.TBCTL.bit.PHSEN = 0; // Disable phase loading
EPwm1Regs.TBPHS.bit.TBPHS = 0; // Phase is 0

EPwm1Regs.TBCTL.bit.HSPCLKDIV = 0; // Clock ratio
EPwm1Regs.TBCTL.bit.CLKDIV = 0;
//
//Shadow register is set to load on CTR=ZERO
//
EPwm1Regs.CMPCTL.bit.SHDWAMODE = 0; // EPWM1A_SHADOW_MODE
EPwm1Regs.CMPCTL.bit.SHDWBMODE = 0; // EPWM1B_SHADOW_MODE
EPwm1Regs.CMPCTL.bit.LOADAMODE = 2; // EPWM1A_Load_CTR_ZERO
EPwm1Regs.CMPCTL.bit.LOADBMODE = 2; // EPWM1B_Load_CTR_ZERO
//
// Set Compare values
//
EPwm1Regs.CMPA.bit.CMPA = 125; // Set compare A value
//
// Set actions
//
EPwm1Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM1A on Zero
EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR; // Clear PWM1A on event A,
// up count

}


void EPwm2_Init()
{
//
// Setup TBCLK
//
EPwm2Regs.TBCTR = 0; // Clear counter
EPwm2Regs.EPWMSYNCINSEL.bit.SEL = 1;
EPwm2Regs.TBCTL.bit.CTRMODE = 2; // Count up-down
EPwm2Regs.TBPRD = 250; // Timer period for 200 kHz
EPwm2Regs.TBCTL.bit.PHSEN = 1; // Disable phase loading
EPwm2Regs.TBPHS.bit.TBPHS = 0; // Phase is 0
EPwm2Regs.TBCTL.bit.HSPCLKDIV = 0; // Clock ratio
EPwm2Regs.TBCTL.bit.CLKDIV = 0;
//
//Shadow register is set to load on CTR=ZERO
//
EPwm2Regs.CMPCTL.bit.SHDWAMODE = 0; // EPWM1A_SHADOW_MODE
EPwm2Regs.CMPCTL.bit.SHDWBMODE = 0; // EPWM1B_SHADOW_MODE
EPwm2Regs.CMPCTL.bit.LOADAMODE = 2; // EPWM1A_Load_CTR_ZERO
EPwm2Regs.CMPCTL.bit.LOADBMODE = 2; // EPWM1B_Load_CTR_ZERO
//
// Set Compare values
//
EPwm2Regs.CMPA.bit.CMPA = 125; // Set compare A value
//
// Set actions
//
EPwm2Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM1A on Zero
EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR; // Clear PWM1A on event A,
// up count

}
//
// End of file
//

这是我在示波器上看到的结果：您能确认吗？

这里还有 ePWM1和2配置的寄存器导出。 请与寄存器进行比较、看看是否有什么不同。

e2e.ti.com/.../epwmregs.txt

此致！

马瑞安