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[参考译文] LAUNCHXL-F280025C：通用电机实验室：使用更高的系统时钟

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Guru**** 2581345 points
Other Parts Discussed in Thread: LAUNCHXL-F280025C, C2000WARE

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1200715/launchxl-f280025c-universal-motor-lab-using-a-higher-system-clock

器件型号：LAUNCHXL-F280025C
主题中讨论的其他器件： C2000WARE

您好！

该实验示例使用了 PWM 时间周期数宏、我认为这是用于使用 LAUNCHXL-F280025C 的100Mhz 系统时钟。

#define USER_M1_PWM_TBPRD_NUM    (uint16_t)(USER_SYSTEM_FREQ_MHz * 1000.0f / USER_M1_PWM_FREQ_kHz / 2.0f)

 HAL_setupPWMs ()正在使用该宏设置 pwmPeriodCycles。

 uint16_t    pwmPeriodCycles =(uint16_t)(USER_M1_PWM_TBPRD_NUM)；

我计划在定制电路板上以50kHz PWM 和200MHz 的系统时钟运行。   对于200MHz 系统时钟、这个宏的建议值是多少？ 我尝试了几种组合。 例如、如果我在宏中除以4以补偿系统时钟加倍、那么 我的 PWM 输出为 50Hz、但示例未运行。 TBPRD 为1000、CMPA 为500。

如果我尝试将 TBPRD 设置为2500、将 CMPA 设置为1250  (除以1.6)、则我的 输出 PWM 为20kHz、而目标 PWM 为50kHz。 

void HAL_setupPWMs(HAL_MTR_Handle handle)
{
    HAL_MTR_Obj    *obj = (HAL_MTR_Obj *)handle;
    uint16_t  cnt;

    uint16_t       pwmPeriodCycles = (uint16_t)(USER_M1_PWM_TBPRD_NUM);
    uint16_t       numPWMTicksPerISRTick = USER_M1_NUM_PWM_TICKS_PER_ISR_TICK;

    // disable the ePWM module time base clock sync signal
    // to synchronize all of the PWMs
    SysCtl_disablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);

    // turns off the outputs of the EPWM peripherals which will put the power
    // switches into a high impedance state.
    EPWM_forceTripZoneEvent(obj->pwmHandle[0], EPWM_TZ_FORCE_EVENT_OST);
    EPWM_forceTripZoneEvent(obj->pwmHandle[1], EPWM_TZ_FORCE_EVENT_OST);
    EPWM_forceTripZoneEvent(obj->pwmHandle[2], EPWM_TZ_FORCE_EVENT_OST);

#if defined(BSXL8323RS_REVA) || defined(BSXL8323RH_REVB) || \
    defined(BSXL8353RS_REVA) || defined(BSXL8316RT_REVA) || \
    defined(BSXL3PHGAN_REVA) || defined(HVMTRPFC_REV1P1) || \
    defined(DRV8329AEVM_REVA)

    for(cnt=0; cnt<3; cnt++)
    {
        // setup the Time-Base Control Register (TBCTL)
        EPWM_setTimeBaseCounterMode(obj->pwmHandle[cnt],
                                    EPWM_COUNTER_MODE_UP_DOWN);

        EPWM_disablePhaseShiftLoad(obj->pwmHandle[cnt]);

        EPWM_setPeriodLoadMode(obj->pwmHandle[cnt], EPWM_PERIOD_DIRECT_LOAD);
/* Commented JS
        EPWM_enableSyncOutPulseSource(obj->pwmHandle[cnt],
                                      EPWM_SYNC_OUT_PULSE_ON_SOFTWARE);
*/
        EPWM_setClockPrescaler(obj->pwmHandle[cnt], EPWM_CLOCK_DIVIDER_2,
                                 EPWM_HSCLOCK_DIVIDER_2);

        EPWM_setCountModeAfterSync(obj->pwmHandle[cnt],
                                   EPWM_COUNT_MODE_UP_AFTER_SYNC);

        EPWM_setEmulationMode(obj->pwmHandle[cnt], EPWM_EMULATION_FREE_RUN);

        // setup the Timer-Based Phase Register (TBPHS)
        EPWM_setPhaseShift(obj->pwmHandle[cnt], 0);

        // setup the Time-Base Counter Register (TBCTR)
        EPWM_setTimeBaseCounter(obj->pwmHandle[cnt], 0);

        // setup the Time-Base Period Register (TBPRD)
        // set to zero initially
        EPWM_setTimeBasePeriod(obj->pwmHandle[cnt], 0);

        // setup the Counter-Compare Control Register (CMPCTL)
        EPWM_setCounterCompareShadowLoadMode(obj->pwmHandle[cnt],
                                             EPWM_COUNTER_COMPARE_A,
                                             EPWM_COMP_LOAD_ON_CNTR_ZERO);

        EPWM_setCounterCompareShadowLoadMode(obj->pwmHandle[cnt],
                                             EPWM_COUNTER_COMPARE_B,
                                             EPWM_COMP_LOAD_ON_CNTR_ZERO);

        EPWM_setCounterCompareShadowLoadMode(obj->pwmHandle[cnt],
                                             EPWM_COUNTER_COMPARE_C,
                                             EPWM_COMP_LOAD_ON_CNTR_ZERO);

        EPWM_setCounterCompareShadowLoadMode(obj->pwmHandle[cnt],
                                             EPWM_COUNTER_COMPARE_D,
                                             EPWM_COMP_LOAD_ON_CNTR_ZERO);

#if defined(MOTOR1_ISBLDC)
        // setup the Action-Qualifier Output A Register (AQCTLA)
        EPWM_setActionQualifierAction(obj->pwmHandle[cnt],
                                      EPWM_AQ_OUTPUT_A,
                                      EPWM_AQ_OUTPUT_HIGH,
                                      EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

        EPWM_setActionQualifierAction(obj->pwmHandle[cnt],
                                      EPWM_AQ_OUTPUT_A,
                                      EPWM_AQ_OUTPUT_LOW,
                                      EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

        // setup the Action-qualifier Continuous Software Force Register (AQCSFRC)
        EPWM_setActionQualifierContSWForceAction(obj->pwmHandle[cnt],
                                                 EPWM_AQ_OUTPUT_B,
                                                 EPWM_AQ_SW_OUTPUT_LOW);

        // setup the Dead-Band Generator Control Register (DBCTL)
        EPWM_setDeadBandDelayMode(obj->pwmHandle[cnt], EPWM_DB_RED, false);
        EPWM_setDeadBandDelayMode(obj->pwmHandle[cnt], EPWM_DB_FED, false);

#else   //!MOTOR1_ISBLDC


#if defined(MOTOR1_DCLINKSS)
        // setup the Action-Qualifier Output A Register (AQCTLA)
        EPWM_setActionQualifierAction(obj->pwmHandle[cnt],
                                      EPWM_AQ_OUTPUT_A,
                                      EPWM_AQ_OUTPUT_HIGH,
                                      EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

        EPWM_setActionQualifierAction(obj->pwmHandle[cnt],
                                      EPWM_AQ_OUTPUT_A,
                                      EPWM_AQ_OUTPUT_LOW,
                                      EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);

        EPWM_setActionQualifierAction(obj->pwmHandle[cnt],
                                      EPWM_AQ_OUTPUT_A,
                                      EPWM_AQ_OUTPUT_LOW,
                                      EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

        EPWM_setActionQualifierAction(obj->pwmHandle[cnt],
                                      EPWM_AQ_OUTPUT_A,
                                      EPWM_AQ_OUTPUT_HIGH,
                                      EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
#else  // !(MOTOR1_DCLINKSS)
        // setup the Action-Qualifier Output A Register (AQCTLA)
        EPWM_setActionQualifierAction(obj->pwmHandle[cnt],
                                      EPWM_AQ_OUTPUT_A,
                                      EPWM_AQ_OUTPUT_HIGH,
                                      EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

        EPWM_setActionQualifierAction(obj->pwmHandle[cnt],
                                      EPWM_AQ_OUTPUT_A,
                                      EPWM_AQ_OUTPUT_HIGH,
                                      EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);

        EPWM_setActionQualifierAction(obj->pwmHandle[cnt],
                                      EPWM_AQ_OUTPUT_A,
                                      EPWM_AQ_OUTPUT_LOW,
                                      EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

        EPWM_setActionQualifierAction(obj->pwmHandle[cnt],
                                      EPWM_AQ_OUTPUT_A,
                                      EPWM_AQ_OUTPUT_LOW,
                                      EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

#endif  // !(MOTOR1_DCLINKSS)

        // setup the Dead-Band Generator Control Register (DBCTL)
        EPWM_setDeadBandDelayMode(obj->pwmHandle[cnt], EPWM_DB_RED, true);
        EPWM_setDeadBandDelayMode(obj->pwmHandle[cnt], EPWM_DB_FED, true);

        // select EPWMA as the input to the dead band generator
        EPWM_setRisingEdgeDeadBandDelayInput(obj->pwmHandle[cnt],
                                             EPWM_DB_INPUT_EPWMA);

        // configure the right polarity for active high complementary config.
        EPWM_setDeadBandDelayPolarity(obj->pwmHandle[cnt],
                                      EPWM_DB_RED,
                                      EPWM_DB_POLARITY_ACTIVE_HIGH);
        EPWM_setDeadBandDelayPolarity(obj->pwmHandle[cnt],
                                      EPWM_DB_FED,
                                      EPWM_DB_POLARITY_ACTIVE_LOW);

        // setup the Dead-Band Rising Edge Delay Register (DBRED)
        EPWM_setRisingEdgeDelayCount(obj->pwmHandle[cnt], MTR1_PWM_DBRED_CNT);

        // setup the Dead-Band Falling Edge Delay Register (DBFED)
        EPWM_setFallingEdgeDelayCount(obj->pwmHandle[cnt], MTR1_PWM_DBFED_CNT);

#endif  //!MOTOR1_ISBLDC

        // setup the PWM-Chopper Control Register (PCCTL)
        EPWM_disableChopper(obj->pwmHandle[cnt]);

        // setup the Trip Zone Select Register (TZSEL)
        EPWM_disableTripZoneSignals(obj->pwmHandle[cnt], HAL_TZSEL_SIGNALS_ALL);
    }

    // BSXL8323RS_REVA || BSXL8323RH_REVB || BSXL8353RS_REVA || \
    // BSXL8316RT_REVA || BSXL3PHGAN_REVA || HVMTRPFC_REV1P1 || \
    // DRV8329AEVM_REVA
#else
#error The PWM is not configured for motor_1 control
#endif  // boards

#if defined(MOTOR1_ISBLDC)
    // setup the Event Trigger Selection Register (ETSEL)
    EPWM_setInterruptSource(obj->pwmHandle[0], EPWM_INT_TBCTR_ZERO);

    EPWM_disableInterrupt(obj->pwmHandle[0]);

    EPWM_setADCTriggerSource(obj->pwmHandle[0],
                             EPWM_SOC_A, EPWM_SOC_TBCTR_ZERO);

    EPWM_enableADCTrigger(obj->pwmHandle[0], EPWM_SOC_A);

    EPWM_setADCTriggerSource(obj->pwmHandle[0],
                              EPWM_SOC_B, EPWM_SOC_TBCTR_U_CMPB);

    EPWM_enableADCTrigger(obj->pwmHandle[0], EPWM_SOC_B);
#elif defined(MOTOR1_DCLINKSS)
    // setup the Event Trigger Selection Register (ETSEL)
    EPWM_setInterruptSource(obj->pwmHandle[0], EPWM_INT_TBCTR_ZERO);

    EPWM_enableInterrupt(obj->pwmHandle[0]);

    EPWM_setADCTriggerSource(obj->pwmHandle[0],
                             EPWM_SOC_A, EPWM_SOC_TBCTR_D_CMPC);

    EPWM_enableADCTrigger(obj->pwmHandle[0], EPWM_SOC_A);

    // ADC SOC trigger for the 1st dc-link current sampling
    EPWM_setADCTriggerSource(obj->pwmHandle[1],
                                 EPWM_SOC_A,
                                 EPWM_SOC_TBCTR_U_CMPC);

    EPWM_enableADCTrigger(obj->pwmHandle[1], EPWM_SOC_A);

    // ADC SOC trigger for the 2nd dc-link current sampling
    EPWM_setADCTriggerSource(obj->pwmHandle[1],
                             EPWM_SOC_B,
                             EPWM_SOC_TBCTR_U_CMPD);

    EPWM_enableADCTrigger(obj->pwmHandle[1], EPWM_SOC_B);

    // ADC SOC trigger for the 3rd dc-link current sampling
    EPWM_setADCTriggerSource(obj->pwmHandle[2],
                                 EPWM_SOC_A,
                                 EPWM_SOC_TBCTR_D_CMPC);

    EPWM_enableADCTrigger(obj->pwmHandle[2], EPWM_SOC_A);

    // ADC SOC trigger for the 4th dc-link current sampling
    EPWM_setADCTriggerSource(obj->pwmHandle[2],
                             EPWM_SOC_B,
                             EPWM_SOC_TBCTR_D_CMPD);

    EPWM_enableADCTrigger(obj->pwmHandle[2], EPWM_SOC_B);
#else   //!(MOTOR1_ISBLDC || MOTOR1_DCLINKSS)
    // setup the Event Trigger Selection Register (ETSEL)
    EPWM_setInterruptSource(obj->pwmHandle[0], EPWM_INT_TBCTR_ZERO);

    EPWM_enableInterrupt(obj->pwmHandle[0]);

    EPWM_setADCTriggerSource(obj->pwmHandle[0],
                             EPWM_SOC_A, EPWM_SOC_TBCTR_D_CMPC);

    EPWM_enableADCTrigger(obj->pwmHandle[0], EPWM_SOC_A);
#endif  // !(MOTOR1_ISBLDC || MOTOR1_DCLINKSS)

    // setup the Event Trigger Prescale Register (ETPS)
    if(numPWMTicksPerISRTick > 15)
    {
        numPWMTicksPerISRTick = 15;
    }
    else if(numPWMTicksPerISRTick < 1)
    {
        numPWMTicksPerISRTick = 1;
    }

    EPWM_setInterruptEventCount(obj->pwmHandle[0], numPWMTicksPerISRTick);

    EPWM_setADCTriggerEventPrescale(obj->pwmHandle[0], EPWM_SOC_A,
                                    numPWMTicksPerISRTick);
    EPWM_setADCTriggerEventPrescale(obj->pwmHandle[0], EPWM_SOC_B,
                                    numPWMTicksPerISRTick);

#if defined(MOTOR1_DCLINKSS)
    EPWM_setADCTriggerEventPrescale(obj->pwmHandle[1], EPWM_SOC_A,
                                    numPWMTicksPerISRTick);
    EPWM_setADCTriggerEventPrescale(obj->pwmHandle[1], EPWM_SOC_B,
                                    numPWMTicksPerISRTick);

    EPWM_setADCTriggerEventPrescale(obj->pwmHandle[2], EPWM_SOC_A,
                                    numPWMTicksPerISRTick);
    EPWM_setADCTriggerEventPrescale(obj->pwmHandle[2], EPWM_SOC_B,
                                    numPWMTicksPerISRTick);
#endif  //MOTOR1_DCLINKSS

    // setup the Event Trigger Clear Register (ETCLR)
    EPWM_clearEventTriggerInterruptFlag(obj->pwmHandle[0]);
    EPWM_clearADCTriggerFlag(obj->pwmHandle[0], EPWM_SOC_A);
    EPWM_clearADCTriggerFlag(obj->pwmHandle[0], EPWM_SOC_B);

    // since the PWM is configured as an up/down counter, the period register is
    // set to one-half of the desired PWM period
    EPWM_setTimeBasePeriod(obj->pwmHandle[0], pwmPeriodCycles);
    EPWM_setTimeBasePeriod(obj->pwmHandle[1], pwmPeriodCycles);
    EPWM_setTimeBasePeriod(obj->pwmHandle[2], pwmPeriodCycles);

    // write the PWM data value  for ADC trigger
    EPWM_setCounterCompareValue(obj->pwmHandle[0], EPWM_COUNTER_COMPARE_C, 10);

    // write the PWM data value  for ADC trigger
#if defined(MOTOR1_DCLINKSS)
    EPWM_clearADCTriggerFlag(obj->pwmHandle[1], EPWM_SOC_A);
    EPWM_clearADCTriggerFlag(obj->pwmHandle[1], EPWM_SOC_B);

    EPWM_clearADCTriggerFlag(obj->pwmHandle[2], EPWM_SOC_A);
    EPWM_clearADCTriggerFlag(obj->pwmHandle[2], EPWM_SOC_B);

    EPWM_setCounterCompareValue(obj->pwmHandle[1],
                                EPWM_COUNTER_COMPARE_C, pwmPeriodCycles>>1);
    EPWM_setCounterCompareValue(obj->pwmHandle[1],
                                EPWM_COUNTER_COMPARE_D, pwmPeriodCycles>>1);

    EPWM_setCounterCompareValue(obj->pwmHandle[2],
                                EPWM_COUNTER_COMPARE_C, pwmPeriodCycles>>1);
    EPWM_setCounterCompareValue(obj->pwmHandle[2],
                                EPWM_COUNTER_COMPARE_D, pwmPeriodCycles>>1);

#endif  //MOTOR1_DCLINKSS


    // enable the ePWM module time base clock sync signal
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);

    return;
}  // end of HAL_setupPWMs() function

  • 0
    TI__Guru**** 2581345 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

    否 您无法将 F280025C 的系统时钟更改为200MHz。 F280025C 的最大系统时钟为100MHz。 如果您需要具有200MHz 的 C2000、则应选择 F2837x 或 F2838x 器件。

    实际上、100MHz F28002x 或120MHz F28003x 足以支持 50kHz PWM、您可能只需要将控制 ISR 频率抽取为25KHz。

  • 0
    TI__Guru**** 2581345 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

    您好、Yanming：

    我使用的是基于  F28379s 的定制电路板、时钟为 200MHz。

    谢谢。

    Jagbir

  • 0
    TI__Guru**** 2581345 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

    好的。 您可以参考   C2000Ware 中 F28379s 的 device.c 和 device.h 文件、以便根据电路板上使用的晶体/振荡器来配置 PLL。

    BTW、   即使您将 F28379s 的系统时钟设置为200MHz、PWM 时钟仍为100MHz。 请查看 F28379s 的数据表和 TRM、了解有关 F28379s 上 ePWM 时钟的更多详细信息 。

  • 0
    TI__Guru**** 2581345 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

    我已将  F28379上的 ePWM 时钟设置为100MHz。 基于此、我的 TBPRD 值是1000、CMPA 为500。 我的 ISR 是每20us 一次(50kHz PWM)。 我只能低速运行电机。  下面是我面临的问题。

    • 我的 ADC 转换不在 PWM/电流波形的中间
    • 电流波形不是正弦波形。

    问题：

    1.   TBPRD 计算是否正确
    2. 为什么我的 ADC 转换不在电流波形的中间。

      

  • 0
    TI__Guru**** 2581345 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
    Unknown 说：
     我的 TBPRD 计算是否正确

    是的、没错。

    Unknown 说：
    为什么我的 ADC 转换不在当前波形的中间。

    您使用的逆变器电路板和构建级别是什么？ ADC 采样在每个 PWM 周期的 TBCNT=0时触发。

    您应该缩小电流波形、看看电流波形是否 与 电机以电气频率运行时的正弦波形相似。

  • 0
    TI__Guru**** 2581345 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
    zhengfeng zhang 说：
    您使用的逆变器板和构建级别

    我使用的是 DRV8323RS。

    zhengfeng zhang 说：
    您应缩小  电流波形以查看电机电频率运行时电流波形是否为类似正弦形状。

    电流波形不是正弦波形。 它的形状是三角形。

  • 0
    TI__Guru**** 2581345 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

    电流波形取决于 BEMF 形状 、该形状可能类似于正弦曲线、而不是某些电机上的理想正弦曲线。

    您可以尝试将示波器的时间设置为10ms、以监控电机相电流。