[参考译文] TMS320F28P650SK：器件上电后的 GPIO 状态测量

尊敬的 Masoud：

[引用 userid=“5666507" url="“ url="~“~/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1566882/tms320f28p650sk-gpio-status-measurement-after-device-power-on/6037603 ]在复位/上电‐开启时、GPIO/多路复用引脚默认为 GPIO‐输入（高‐阻抗）。 高阻抗意味着该引脚没有被 MCU 主动驱动（拉电流或灌电流）、因此原则上它应该悬空。 [/报价]

我完全同意你的说法。

但是、我重复了客户与内部应用程序团队的 100 针 VDB（插座板）的问题。

确实可以看到、GPIO92 在上电期间具有明显的 3.3V 电压、而这取决于用户代码。  

(1)。 您 是否也可以使用我们的 100 引脚 VDB 对其进行测试？

(2)。 我们试错了、 在 board_init () 中删除两个引脚的初始化、然后在几行后（附加的代码）将这些引脚初始化代码放回原位、然后在 100 引脚 VDB 上对 GPIO92 上的 3.3V 电压进行了测试。

EPWM3A (GPIO 4/引脚 93)

EPWM14A (GPIO 203/引脚 11)

Board_init();
    GPIO_writePin(DEBUG_GPIO, 1);
    I2CFIFO_Init();
    LCD_Init();
    EALLOW;
    GPIO_setPinConfig(DD_EPWM_EPWMA_PIN_CONFIG);
    GPIO_setPadConfig(DD_EPWM_EPWMA_GPIO, GPIO_PIN_TYPE_STD);
    GPIO_setQualificationMode(DD_EPWM_EPWMA_GPIO, GPIO_QUAL_SYNC);

    GPIO_setPinConfig(DD_EPWM_EPWMB_PIN_CONFIG);
    GPIO_setPadConfig(DD_EPWM_EPWMB_GPIO, GPIO_PIN_TYPE_STD);
    GPIO_setQualificationMode(DD_EPWM_EPWMB_GPIO, GPIO_QUAL_SYNC);
    EPWM_setEmulationMode(DD_EPWM_BASE, EPWM_EMULATION_FREE_RUN);
    EPWM_setClockPrescaler(DD_EPWM_BASE, EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);
    EPWM_setTimeBasePeriod(DD_EPWM_BASE, 999);
    EPWM_setTimeBaseCounter(DD_EPWM_BASE, 0);
    EPWM_setTimeBaseCounterMode(DD_EPWM_BASE, EPWM_COUNTER_MODE_UP);
    EPWM_disablePhaseShiftLoad(DD_EPWM_BASE);
    EPWM_setPhaseShift(DD_EPWM_BASE, 0);
    EPWM_setSyncInPulseSource(DD_EPWM_BASE, EPWM_SYNC_IN_PULSE_SRC_DISABLE);
    EPWM_setSyncPulseSource(DD_EPWM_BASE, HRPWM_PWMSYNC_SOURCE_ZERO);
    EPWM_setCounterCompareValue(DD_EPWM_BASE, EPWM_COUNTER_COMPARE_A, 0);
    EPWM_setCounterCompareShadowLoadMode(DD_EPWM_BASE, EPWM_COUNTER_COMPARE_A, EPWM_COMP_LOAD_ON_CNTR_ZERO);
    EPWM_setCounterCompareValue(DD_EPWM_BASE, EPWM_COUNTER_COMPARE_B, 0);
    EPWM_setCounterCompareShadowLoadMode(DD_EPWM_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_CNTR_ZERO);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);
    EPWM_setActionQualifierAction(DD_EPWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);
    EPWM_setRisingEdgeDelayCountShadowLoadMode(DD_EPWM_BASE, EPWM_RED_LOAD_ON_CNTR_ZERO);
    EPWM_disableRisingEdgeDelayCountShadowLoadMode(DD_EPWM_BASE);
    EPWM_setFallingEdgeDelayCountShadowLoadMode(DD_EPWM_BASE, EPWM_FED_LOAD_ON_CNTR_ZERO);
    EPWM_disableFallingEdgeDelayCountShadowLoadMode(DD_EPWM_BASE);
    EPWM_setTripZoneAction(DD_EPWM_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
    EPWM_setTripZoneAction(DD_EPWM_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW);
    EPWM_enableADCTrigger(DD_EPWM_BASE, EPWM_SOC_A);
    EPWM_setADCTriggerSource(DD_EPWM_BASE, EPWM_SOC_A, EPWM_SOC_TBCTR_ZERO);
    EPWM_setADCTriggerEventPrescale(DD_EPWM_BASE, EPWM_SOC_A, 1);
    EDIS;

谢谢、  

Johnny