TMS320F280025: CMPSS误触发

测试时发现cmpss保护误触发，实际电压仅有1.9V，将相应引脚（8脚）接地后仍然触发保护，可能是什么原因导致的

Green Deng：

你好，有确认过是否确实是由CMPSS触发的误保护？或者会不会引脚有干扰导致保护被触发？

目前的信息来看没办法判定具体问题是什么引起的。

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Xiangdong Liu：

您好，通过判断确认时CMPSS保护，为了判断是不是干扰，将引脚进行了接地，运行一段时间后还是会触发

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Green Deng：

这样的话可能需要你附上CMPSS部分的代码，目前的信息看不出是什么原因。

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Xiangdong Liu：

void InitComp(void){ /* set up the GPIO and X-BAR input configurations before enabling the TZ*/ EPwm1Regs.TZSEL.all = 0x0; EPwm2Regs.TZSEL.all = 0x0;

/* Initialize Analog Subsystem */ EALLOW; AnalogSubsysRegs.CMPHPMXSEL.bit.CMP1HPMXSEL = 1; // Bits to select one of the many sources on CopmHP inputs. Refer to Pimux diagram for details. EDIS;

/* Initialize Comparators */ EALLOW; //Cmpss1Regs.COMPCTL.all = 0x9414; Cmpss1Regs.COMPCTL.bit.COMPHSOURCE = 0; // 0 High Comparator Source Select Cmpss1Regs.COMPCTL.bit.COMPHINV = 0; // 1 High Comparator Invert Select Cmpss1Regs.COMPCTL.bit.CTRIPHSEL = 1; // 3:2 High Comparator Trip Select Cmpss1Regs.COMPCTL.bit.CTRIPOUTHSEL = 1; // 5:4 High Comparator Trip Output Select Cmpss1Regs.COMPCTL.bit.ASYNCHEN = 0; // 6 High Comparator Asynchronous Path Enable Cmpss1Regs.COMPCTL.bit.COMPLSOURCE = 0; // 8 Low Comparator Source Select Cmpss1Regs.COMPCTL.bit.COMPLINV = 0; // 9 Low Comparator Invert Select Cmpss1Regs.COMPCTL.bit.CTRIPLSEL = 1; // 11:10 Low Comparator Trip Select Cmpss1Regs.COMPCTL.bit.CTRIPOUTLSEL = 1; // 13:12 Low Comparator Trip Output Select Cmpss1Regs.COMPCTL.bit.ASYNCLEN = 0; // 14 Low Comparator Asynchronous Path Enable Cmpss1Regs.COMPCTL.bit.COMPDACE = 1; // 15 Comparator/DAC Enable

Cmpss1Regs.DACHVALS.bit.DACVAL = 3723; // 20A / #define ADC_CURRENT_BUSIN_OC_FIXED_COEFF (0.0052882) Cmpss1Regs.DACLVALS.bit.DACVAL = 3723; // 20A / #define ADC_CURRENT_BUSIN_OC_FIXED_COEFF (0.0052882)

//Cmpss1Regs.COMPLOCK.all = 0x000F; Cmpss1Regs.COMPLOCK.bit.COMPCTL = 1; // 0 COMPCTL Lock Cmpss1Regs.COMPLOCK.bit.COMPHYSCTL = 1; // 1 COMPHYSCTL Lock Cmpss1Regs.COMPLOCK.bit.DACCTL = 1; // 2 DACCTL Lock Cmpss1Regs.COMPLOCK.bit.CTRIP = 1; // 3 CTRIP Lock EDIS;

/* Initialize EPwmXbarRegs */ EALLOW; EPwmXbarRegs.TRIP4MUX0TO15CFG.bit.MUX0 = 0; // 1:0 Mux0 Configuration for TRIP4 of EPWM-XBAR EPwmXbarRegs.TRIP4MUXENABLE.bit.MUX0 = 1; // ePWM XBAR Mux Enable for TRIP4 EPwmXbarRegs.TRIPOUTINV.bit.TRIP4 = 0; // ePWM XBAR Output Inversion Register EDIS;

/* Initialize DC */ EALLOW; EPwm1Regs.DCTRIPSEL.bit.DCAHCOMPSEL = DC_TRIPIN4; // 3:0 Digital Compare A High COMP Input Select EPwm1Regs.DCTRIPSEL.bit.DCBHCOMPSEL = DC_TRIPIN4; // 11:8 Digital Compare B High COMP Input Select EPwm1Regs.DCACTL.bit.EVT2SRCSEL = DC_EVT2; // 8 DCAEVT2 Source Signal EPwm1Regs.DCACTL.bit.EVT2FRCSYNCSEL = DC_EVT_ASYNC; // 9 DCAEVT2 Force Sync Signal

EPwm2Regs.DCTRIPSEL.bit.DCAHCOMPSEL = DC_TRIPIN4; // 3:0 Digital Compare A High COMP Input Select EPwm2Regs.DCTRIPSEL.bit.DCBHCOMPSEL = DC_TRIPIN4; // 11:8 Digital Compare B High COMP Input Select EPwm2Regs.DCACTL.bit.EVT2SRCSEL = DC_EVT2; // 8 DCAEVT2 Source Signal EPwm2Regs.DCACTL.bit.EVT2FRCSYNCSEL = DC_EVT_ASYNC; // 9 DCAEVT2 Force Sync Signal EDIS;

/* Initialize TZ */ EALLOW; EPwm1Regs.TZDCSEL.bit.DCAEVT2 = TZ_DCAH_HI; // 5:3 Digital Compare Output A Event 2 EPwm1Regs.TZSEL.bit.DCAEVT2 = 1; // 6 DCAEVT2 CBC select EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_LO; // 1:0 TZ1 to TZ6 Trip Action On EPWMxA EPwm1Regs.TZCTL.bit.TZB = TZ_FORCE_LO; // 3:2 TZ1 to TZ6 Trip Action On EPWMxB EPwm1Regs.TZCLR.all = 0xFFFF; // Trip Zone Clear Register

EPwm2Regs.TZDCSEL.bit.DCAEVT2 = TZ_DCAH_HI; // 5:3 Digital Compare Output A Event 2 EPwm2Regs.TZSEL.bit.DCAEVT2 = 1; // 6 DCAEVT2 CBC select EPwm2Regs.TZCTL.bit.TZA = TZ_FORCE_LO; // 1:0 TZ1 to TZ6 Trip Action On EPWMxA EPwm2Regs.TZCTL.bit.TZB = TZ_FORCE_LO; // 3:2 TZ1 to TZ6 Trip Action On EPWMxB EPwm2Regs.TZCLR.all = 0xFFFF; // Trip Zone Clear Register EDIS;

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Green Deng：

你的代码中只配置了：

EALLOW;
AnalogSubsysRegs.CMPHPMXSEL.bit.CMP1HPMXSEL = 1; // Bits to select one of the many sources on CopmHP inputs. Refer to Pimux diagram for details.
EDIS;

CMP1LPMXSEL 没有被配置。 COMPL 是随机跳闸的吗？

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Xiangdong Liu：

我只使用了COMPH