TMS320F280033: CMPSS

TMS320F280033中配置CMPSS触发EPWM的TZ模块进行封锁EPWM输出，配置了链路通道，分别位CMPSS1和CMPSS2，CMPSS1可以正常触发TZ模块，但是CMPSS触发条件时会使芯片复位，看门狗没有使能。芯片供电也正常，没有断电。把CMPSS2的模拟量信号给到CMPSS1，也会导致同样的现象。这个是配置有问题吗，但是为什么会使芯片复位。

void dev_cmpss_init(void)
{//// Disable all the muxes first//XBAR_enableEPWMMux(XBAR_TRIP4, 0x00);//// Analog Routing//  Set CMPSS1 to compare VBUS voltage signal, A6//  Set CMPSS2 to compare V12V voltage signal,  A5//  Set CMPSS3 to compare I_DCDC_P current signal,  A3//  Set CMPSS4 to compare I_12V current signal, A8//ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_1, 0x2);  //A6
//ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_2, 0x5);  //A5
//ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_3, 0x5);  //A3ASysCtl_selectCMPHPMux(ASYSCTL_CMPHPMUX_SELECT_2, 0x4);  //A8ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_1, 0x2);
//ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_2, 0x5);
//ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_3, 0x5);ASysCtl_selectCMPLPMux(ASYSCTL_CMPLPMUX_SELECT_2, 0x4);//// Set trip limits in CMPSS// Link CMPSS events to EPWM modules//  Link CMPSS1 to EPWM TZ event//  Link CMPSS2 to EPWM TZ event//  Link CMPSS3 to EPWM TZ event//  Link CMPSS4 to EPWM TZ event//dev_cmpss_set_trip_limit(VBUS_CMPSS_BASE, VBUS_TRIP_DACVAL);XBAR_setEPWMMuxConfig(XBAR_TRIP4, XBAR_EPWM_MUX00_CMPSS1_CTRIPH);XBAR_enableEPWMMux(XBAR_TRIP4, XBAR_MUX00);
//
//dev_cmpss_set_trip_limit(V12V_CMPSS_BASE, V12V_TRIP_DACVAL);
//XBAR_setEPWMMuxConfig(XBAR_TRIP4, XBAR_EPWM_MUX02_CMPSS2_CTRIPH);
//XBAR_enableEPWMMux(XBAR_TRIP4, XBAR_MUX02);
//
//dev_cmpss_set_trip_limit(IDCDCP_CMPSS_BASE, IDCDCP_TRIP_DACVAL);
//XBAR_setEPWMMuxConfig(XBAR_TRIP4, XBAR_EPWM_MUX04_CMPSS3_CTRIPH);
//XBAR_enableEPWMMux(XBAR_TRIP4, XBAR_MUX04);
//
//dev_cmpss_set_trip_limit(I12V_CMPSS_BASE, I12V_TRIP_DACVAL);
//XBAR_setEPWMMuxConfig(XBAR_TRIP4, XBAR_EPWM_MUX06_CMPSS4_CTRIPH);
//XBAR_enableEPWMMux(XBAR_TRIP4, XBAR_MUX06);dev_cmpss_set_trip_limit(CMPSS2_BASE, I12V_TRIP_DACVAL);XBAR_setEPWMMuxConfig(XBAR_TRIP4, XBAR_EPWM_MUX02_CMPSS2_CTRIPH);XBAR_enableEPWMMux(XBAR_TRIP4, XBAR_MUX02);
}


static void dev_cmpss_set_trip_limit(uint32_t cmpss_base, int16_t DACval)
{////Enable CMPSS1//CMPSS_enableModule(cmpss_base);////Use VDDA as the reference for comparator DACs//CMPSS_configDAC(cmpss_base,CMPSS_DACVAL_SYSCLK | CMPSS_DACREF_VDDA | CMPSS_DACSRC_SHDW);////Set DAC to H~90% and L ~10% valuess//

//CMPSS_setDACValueHigh(cmpss_base, 2048+DACval);
//CMPSS_setDACValueLow(cmpss_base, 2048-DACval);CMPSS_setDACValueHigh(cmpss_base, DACval);CMPSS_setDACValueLow(cmpss_base, 0);////High Comparator output is "not" inverted for high compare event//Low Comparator output is inverted for for low compare event//CMPSS_configHighComparator(cmpss_base, CMPSS_INSRC_DAC );CMPSS_configLowComparator(cmpss_base, CMPSS_INSRC_DAC | CMPSS_INV_INVERTED);////CMPSS_configFilterHigh(base, samplePrescale,sampleWindow,threshold);//Every 10 sysclk sample once, input 33 samples,//when >= 23 samples are same, output this value//CMPSS_configFilterHigh(cmpss_base, 9, 32, 22); //2.75ussysclk = 120MHz; T = 1/sysclk = 8.3ns,  T_all = 8.3*(9+1)*(32+1) = 2.75usCMPSS_configFilterLow(cmpss_base, 9, 32, 22);////Reset filter logic & start filtering//CMPSS_initFilterHigh(cmpss_base);CMPSS_initFilterLow(cmpss_base);////Configure CTRIPOUT path: Digital filter connect CTRIPOUT3//CMPSS_configOutputsHigh(cmpss_base, CMPSS_TRIP_FILTER | CMPSS_TRIP_FILTER);CMPSS_configOutputsLow(cmpss_base, CMPSS_TRIP_FILTER | CMPSS_TRIP_FILTER);////Comparator hysteresis control , set to 2x typical value//CMPSS_setHysteresis(cmpss_base, 2);////Clear the latched comparator events//CMPSS_clearFilterLatchHigh(cmpss_base);CMPSS_clearFilterLatchLow(cmpss_base);

}dev_epwm_setup_tz_ost(EPWM1_BASE);


static void dev_epwm_setup_tz_ost(uint32_t epwm_base)
{////Trip 4 is the input to the DCAHCOMPSEL. Output eventA1 when DCAH is set.//Set DC event source//
//EPWM_selectDigitalCompareTripInput(epwm_base, EPWM_DC_TRIP_TRIPIN4,EPWM_selectDigitalCompareTripInput(epwm_base, EPWM_DC_TRIP_TRIPIN4,EPWM_DC_TYPE_DCAH);EPWM_setTripZoneDigitalCompareEventCondition(epwm_base,EPWM_TZ_DC_OUTPUT_A1,EPWM_TZ_EVENT_DCXH_HIGH);EPWM_setDigitalCompareEventSource(epwm_base, EPWM_DC_MODULE_A,EPWM_DC_EVENT_1,EPWM_DC_EVENT_SOURCE_ORIG_SIGNAL);EPWM_setDigitalCompareEventSyncMode(epwm_base, EPWM_DC_MODULE_A,EPWM_DC_EVENT_1,EPWM_DC_EVENT_INPUT_NOT_SYNCED);//// Enable the following trips Emulator Stop,TZ1-3 and DCAEVT1//EPWM_enableTripZoneSignals(epwm_base, EPWM_TZ_SIGNAL_DCAEVT1);//// What do we want the OST/CBC events to do?// TZA events can force EPWMxA// TZB events can force EPWMxB//EPWM_setTripZoneAction(epwm_base, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);EPWM_setTripZoneAction(epwm_base, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW);////Clear any spurious trip and trip flag//EPWM_clearTripZoneFlag(epwm_base, (EPWM_TZ_INTERRUPT_OST | EPWM_TZ_INTERRUPT_DCAEVT1));
}

Barbecue：

建议用示波器看一下配置给CMPSS2的外部引脚电平变化，看看有没有超过DSP 允许电压

,

QADZ：

我暂时不具备测试条件，晚点测试。先确认一下，是指ADC引脚的电压不能超过4.6V吗？如果超过就会导致DSP复位？一般这种芯片异常复位的原因有哪些？

,

Ben Qin：

QADZ said:是指ADC引脚的电压不能超过4.6V吗

是的，请在推荐范围内操作。如果超过4.6V，可能会损坏芯片，或者发生不可预测的情况。