[参考译文] TMS320F280025C：更改了 HRPWM CMPAHR 但未生效

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/997072/tms320f280025c-hrpwm-cmpahr-changed-did-not-have-effect

大家好、

我的客户遇到 HRPWM 无法按预期工作的问题。

测试结果如下：

案例1：Boostdutycycle_pu = 0.4、   

          CMPA = 80、CMPAHR = 0、

      测得的实际 PWM 占空比= 35.3%。

 情况  boostdutycycle_pu = 0.404、   

CMPA = 80、CMPAHR = 52224、

 测得的实际 PWM 占空比= 35.3%。

寄存器 CMPAHR 已更改、但波形相同。

案例3：Boostdutycycle_pu = 0.405、   

CMPA = 81、CMPAHR = 0、

实际 PWM 占空比= 34.81%。

由于 CMPA 从80变为81、波形从35.3%更改为34.81%。

下面是配置。

	SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_HRPWM);

	SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);

	SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM1);

	SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM2);



    EPWM_setPeriodLoadMode(base, EPWM_PERIOD_SHADOW_LOAD);
    EPWM_setTimeBasePeriod(base, Period);
    EPWM_setPhaseShift(base, 0);
    EPWM_setTimeBaseCounter(base, 0);
    EPWM_setEmulationMode(base, EMULATION_MODE);
    EPWM_setTimeBaseCounterMode(base, EPWM_COUNTER_MODE_UP);
    EPWM_setClockPrescaler(base, EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);

    //
    // Configure linking between PWM modules
    //
    if(syncmode == EPWM_SYNC_IN_PULSE_SRC_DISABLE) // config as a Master
    {
        //
        // Disable phase shift load
        // sync out on CTR = 0
        //
        EPWM_disablePhaseShiftLoad(base);
        EPWM_enableSyncOutPulseSource(base, EPWM_SYNC_OUT_PULSE_ON_CNTR_ZERO);
    }
    else // Configure module as slave
    {
        //
        // Enable phase shift load
        // Set sync-out to software only (effectively disabled)
        // Set sync-in signal per argument passed in to this function
        // Count up after sync
        //
        EPWM_enablePhaseShiftLoad(base);
        EPWM_enableSyncOutPulseSource(base, EPWM_SYNC_OUT_PULSE_ON_SOFTWARE);
        EPWM_setSyncInPulseSource(base, syncmode);
        EPWM_setCountModeAfterSync(base, EPWM_COUNT_MODE_UP_AFTER_SYNC);
    }

    //
    // ===================================================== //
    // === Configure Counter Compare Submodule Registers === //
    // ===================================================== //
    //
    // Set initial CMPA value
    // Set initial CMPB value
    // Enable CMPA shadow load on CTR = 0
    // Enable CMPB shadow load on CTR = 0
    //
    EPWM_setCounterCompareValue(base, EPWM_COUNTER_COMPARE_A, CMPA);
    EPWM_setCounterCompareValue(base, EPWM_COUNTER_COMPARE_B, CMPB);
    EPWM_setCounterCompareShadowLoadMode(base,
                                         EPWM_COUNTER_COMPARE_A,
                                         EPWM_COMP_LOAD_ON_CNTR_ZERO);
    EPWM_setCounterCompareShadowLoadMode(base,
                                         EPWM_COUNTER_COMPARE_B,
                                         EPWM_COMP_LOAD_ON_CNTR_ZERO);

    //
    // =============================================== //
    // === Configure Dead-Band Submodule Registers === //
    // =============================================== //
    //
    // Active high complementary PWMs - Set up the deadband
    // Enable rising edge delay
    // Enable falling edge delay
    // RED polarity is active high
    // FED polarity is active low (inverted)
    // Enable shadow load on CTR = 0 for RED count
    // Enable shadow load on CTR = 0 for FED count
    //
    EPWM_setRisingEdgeDeadBandDelayInput(base,  EPWM_DB_INPUT_EPWMA);
    EPWM_setFallingEdgeDeadBandDelayInput(base, EPWM_DB_INPUT_EPWMB);
    EPWM_setDeadBandDelayMode(base, EPWM_DB_RED, true);
    EPWM_setDeadBandDelayMode(base, EPWM_DB_FED, true);
    EPWM_setDeadBandDelayPolarity(base, EPWM_DB_RED,
                                  EPWM_DB_POLARITY_ACTIVE_HIGH);
    EPWM_setDeadBandDelayPolarity(base, EPWM_DB_FED,
                                  EPWM_DB_POLARITY_ACTIVE_LOW);
    EPWM_setRisingEdgeDelayCountShadowLoadMode(base,
                                               EPWM_COMP_LOAD_ON_CNTR_PERIOD);
    EPWM_setFallingEdgeDelayCountShadowLoadMode(base,
                                                EPWM_COMP_LOAD_ON_CNTR_PERIOD);
    EPWM_setRisingEdgeDelayCount(base,  red);
    EPWM_setFallingEdgeDelayCount(base, fed);

    //
    // Load AQCSFRC on CTR = 0
    //
    EPWM_setActionQualifierContSWForceShadowMode(base,
                                                 EPWM_COMP_LOAD_ON_CNTR_PERIOD);

#if(EPWM_HR_ENABLED == true)
    //
    // Align HRPWM CMPA value and shadow mode with EPWM
    //
    HRPWM_setCounterCompareValue(base,
                                 HRPWM_COUNTER_COMPARE_A,
                                 0);
    //should be chosen to be the same as the regular load option for the CMPA, CMPB register.
    //If the HRPWM module is configured in UP-DOWN counter mode, the shadow mode for the HRPWM
    // registers must be set to load on both ZERO AND PERIOD.
    HRPWM_setCounterCompareShadowLoadEvent(base,
                                           HRPWM_CHANNEL_A,
                                           HRPWM_LOAD_ON_CNTR_PERIOD);

    //
    // Align the HRPWM CMPA behavior with EPWM
    //
    HRPWM_setMEPEdgeSelect(base,
                           HRPWM_CHANNEL_A,
                           HRPWM_MEP_CTRL_FALLING_EDGE);

    HRPWM_setMEPControlMode(base,
                            HRPWM_CHANNEL_A,
                            HRPWM_MEP_DUTY_PERIOD_CTRL);


//
// HRCAL uses the EPWM1 clock
//
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM1);

    HRPWM_enableAutoConversion(base);

    //
    // Calibrate MEP_ScaleFactor
    //
    do {
            sSfoStatus = SFO();
        } while(sSfoStatus == SFO_INCOMPLETE);