2805的最小系统控制板。原因是AD采样的电压大于零（电流采样的值）的时候，比较模块里的输出会让epwm强制输出低。程序这样设置的。现在我把基板的采样芯片去掉了 就没事了。但没了过流检测功能。我用的是OPA354的采样芯片。给芯片上电没加输入信号 就输出3V的电压。是芯片坏了麽？

我是做LED的，用的28035.遇到上面的问题。我QQ675424388.希望和哪位高人交流下。

// Configure PWMs to create Start of Conversion (SOC) pulses for the ADC//----------------------------------------EPwm1Regs.ETSEL.bit.SOCASEL = ET_CTRU_CMPB; // PWM1 SOCA on CMPB eventEPwm2Regs.ETSEL.bit.SOCASEL = ET_CTRU_CMPA; // PWM2 SOCA on CMPA eventEPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable PWM1 SOCAEPwm2Regs.ETSEL.bit.SOCAEN = 1; // Enable PWM2 SOCAEPwm1Regs.ETPS.bit.SOCAPRD = ET_1ST; // Trigger on every eventEPwm2Regs.ETPS.bit.SOCAPRD = ET_1ST; // Trigger on every event#endif // (INCR_BUILD == 1)EALLOW;Comp1Regs.COMPCTL.bit.SYNCSEL = 0; // asynchronousComp1Regs.COMPCTL.bit.CMPINV = 1; // invert outputComp1Regs.COMPCTL.bit.COMPSOURCE = 0; // use internal DACComp1Regs.COMPCTL.bit.COMPDACEN = 1; // enable comparatorComp1Regs.DACVAL.bit.DACVAL = 764; //number is in Q5 (764=2.463V =>3A)Comp2Regs.COMPCTL.bit.SYNCSEL = 0; // asynchronousComp2Regs.COMPCTL.bit.CMPINV = 1; // invert outputComp2Regs.COMPCTL.bit.COMPSOURCE = 0; // use internal DACComp2Regs.COMPCTL.bit.COMPDACEN = 1; // enable comparatorComp2Regs.DACVAL.bit.DACVAL = 986; // number is in Q5 (986=3.18V =>48V)EPwm1Regs.DCTRIPSEL.bit.DCAHCOMPSEL = DC_COMP1OUT; // DCAH = Comparator 1 outputEPwm1Regs.DCTRIPSEL.bit.DCBHCOMPSEL = DC_COMP2OUT; // DCAL = TZ2EPwm1Regs.TZDCSEL.bit.DCAEVT1 = TZ_DCAH_LOW; // DCAEVT1 = DCAH low(will become active as Comparator1 output goes low)EPwm1Regs.TZDCSEL.bit.DCBEVT1 = TZ_DCBH_LOW; // DCAEVT1 = DCAH low(will become active as Comparator2 output goes low) EPwm1Regs.DCACTL.bit.EVT1SRCSEL = DC_EVT1; // DCAEVT1 = DCAEVT1 (not filtered)EPwm1Regs.DCBCTL.bit.EVT1SRCSEL = DC_EVT1; // DCAEVT1 = DCAEVT1 (not filtered)EPwm1Regs.DCACTL.bit.EVT1FRCSYNCSEL = DC_EVT_ASYNC; // Take async pathEPwm1Regs.DCBCTL.bit.EVT1FRCSYNCSEL = DC_EVT_ASYNC; // Take async pathEPwm1Regs.TZSEL.bit.DCAEVT1 = 1;EPwm1Regs.TZSEL.bit.DCBEVT1 = 1;// What do we want the DCAEVT1 and DCBEVT1 events to do? - DCAEVTx events can force EPWMxA EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_LO; // EPWM1A will go lowEDIS;//=================================================================================// INTERRUPT & ISR INITIALISATION (best to run this section after other initialisation)//=================================================================================EALLOW;PieVectTable.EPWM1_INT = &ISR_Run; // Map InterruptEDIS;PieCtrlRegs.PIEIER3.bit.INTx1 = 1; // PIE level enable, Grp3 / Int1EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // INT on Zero eventEPwm1Regs.ETSEL.bit.INTEN = 1; // Enable INTEPwm1Regs.ETPS.bit.INTPRD = ET_1ST; // Generate INT on every event// Enable Peripheral, global Ints and higher priority real-time debug events:IER |= M_INT3; // Enable CPU INT3 connected to EPWM1-6 INTs:EINT; // Enable Global interrupt INTMERTM; // Enable Global realtime interrupt DBGM//=================================================================================// BACKGROUND (BG) LOOP//=================================================================================//--------------------------------- FRAMEWORK -------------------------------------for(;;){// State machine entry & exit point//===========================================================(*Alpha_State_Ptr)(); // jump to an Alpha state (A0,B0,...)//===========================================================}} //END MAIN CODE//=================================================================================// STATE-MACHINE SEQUENCING AND SYNCRONIZATION//=================================================================================//--------------------------------- FRAMEWORK -------------------------------------void A0(void){// loop rate synchronizer for A-tasksif(CpuTimer0Regs.TCR.bit.TIF == 1){CpuTimer0Regs.TCR.bit.TIF = 1; // clear flag//-----------------------------------------------------------(*A_Task_Ptr)(); // jump to an A Task (A1,A2,A3,...)//-----------------------------------------------------------VTimer0[0]++; // virtual timer 0, instance 0 (spare }Alpha_State_Ptr = &B0; // Comment out to allow only A tasks}void B0(void){// loop rate synchronizer for B-tasksif(CpuTimer1Regs.TCR.bit.TIF == 1){CpuTimer1Regs.TCR.bit.TIF = 1; // clear flag//-----------------------------------------------------------(*B_Task_Ptr)(); // jump to a B Task (B1,B2,B3,...)//-----------------------------------------------------------VTimer1[0]++; // virtual timer 1, instance 0 (used to control SPI LEDsSerialCommsTimer++; // virtual timer 1, instance 1 (used by SciCommsGui.c)}Alpha_State_Ptr = &C0; }void C0(void){// loop rate synchronizer for C-tasksif(CpuTimer2Regs.TCR.bit.TIF == 1){CpuTimer2Regs.TCR.bit.TIF = 1; // clear flag//-----------------------------------------------------------(*C_Task_Ptr)(); // jump to a C Task (C1,C2,C3,...)//-----------------------------------------------------------VTimer2[0]++; // virtual timer 2, instance 0 (spare) }Alpha_State_Ptr = &A0; // Back to State A0}//=================================================================================// A - TASKS//=================================================================================//--------------------------------------------------------void A1(void) // Slewrates (soft-start) of references (Sepic & LED string current 1-4)//--------------------------------------------------------// Task runs every 2ms (CpuTimer0 period [1ms] * 2 "A" tasks active)// Slows the changing of a controller's reference by SlewStep_Sepic or SlewStep_LED{// Dmax ClampingCoef2P2Z_Sepic[5] = DmaxSepic * 67108;Coef2P2Z_LED[5] = Dmax_LED * 67108;//---------------------------------------------------------SlewError = (VREFsepic_slewed - Vtrgt);if (SlewError > SlewStepSepic) VREFsepic_slewed = VREFsepic_slewed - SlewStepSepic;elseif (SlewError < (-SlewStepSepic) ) VREFsepic_slewed = VREFsepic_slewed + SlewStepSepic;else VREFsepic_slewed = Vtrgt;//---------------------------------------------------------//---------------------------------------------------------SlewError = (IREF_LED[1] - Iset_LED[1]);if (SlewError > SlewStep_LED) IREF_LED[1] = IREF_LED[1] - SlewStep_LED;else if (SlewError < (-SlewStep_LED) ) IREF_LED[1] = IREF_LED[1] + SlewStep_LED;else IREF_LED[1] = Iset_LED[1];//---------------------------------------------------------SlewError = (IREF_LED[2] - Iset_LED[2]);if (SlewError > SlewStep_LED) IREF_LED[2] = IREF_LED[2] - SlewStep_LED;else if (SlewError < (-SlewStep_LED) ) IREF_LED[2] = IREF_LED[2] + SlewStep_LED;else IREF_LED[2] = Iset_LED[2];//---------------------------------------------------------SlewError = (IREF_LED[3] - Iset_LED[3]);if (SlewError > SlewStep_LED) IREF_LED[3] = IREF_LED[3] - SlewStep_LED;else if (SlewError < (-SlewStep_LED) ) IREF_LED[3] = IREF_LED[3] + SlewStep_LED;else IREF_LED[3] = Iset_LED[3];//---------------------------------------------------------SlewError = (IREF_LED[4] - Iset_LED[4]);if (SlewError > SlewStep_LED) IREF_LED[4] = IREF_LED[4] - SlewStep_LED;else if (SlewError < (-SlewStep_LED) ) IREF_LED[4] = IREF_LED[4] + SlewStep_LED;else IREF_LED[4] = Iset_LED[4];//---------------------------------------------------------//-------------------A_Task_Ptr = &A2;//-------------------}//-----------------------------------------------------------------void A2(void) // Slewrates (soft-start) of references (LED string current 5-8); UART comms//-----------------------------------------------------------------// Task runs every 2ms (CpuTimer0 period [1ms] * 2 "A" tasks active) // Slows the changing of a controller's reference by SlewStep_LED// SerialHostComms is a function that provides communication with a GUI host if one is connected{if(ClearFaultFlg == 1){UOUTsepic = 0;VREFsepic_slewed = 0;for (i=0; i<9; i++){IREF_LED = 0;}EALLOW;EPwm1Regs.TZCLR.bit.OST = 1;EPwm2Regs.TZCLR.bit.OST = 1;EPwm3Regs.TZCLR.bit.OST = 1;EPwm4Regs.TZCLR.bit.OST = 1;EPwm5Regs.TZCLR.bit.OST = 1;EPwm6Regs.TZCLR.bit.OST = 1;EDIS;ClearFaultFlg = 0;}//---------------------------------------------------------SlewError = (IREF_LED[5] - Iset_LED[5]);if (SlewError > SlewStep_LED) IREF_LED[5] = IREF_LED[5] - SlewStep_LED;else if (SlewError < (-SlewStep_LED) ) IREF_LED[5] = IREF_LED[5] + SlewStep_LED;else IREF_LED[5] = Iset_LED[5];//---------------------------------------------------------SlewError = (IREF_LED[6] - Iset_LED[6]);if (SlewError > SlewStep_LED) IREF_LED[6] = IREF_LED[6] - SlewStep_LED;else if (SlewError < (-SlewStep_LED) ) IREF_LED[6] = IREF_LED[6] + SlewStep_LED;else IREF_LED[6] = Iset_LED[6];//---------------------------------------------------------SlewError = (IREF_LED[7] - Iset_LED[7]);if (SlewError > SlewStep_LED) IREF_LED[7] = IREF_LED[7] - SlewStep_LED;else if (SlewError < (-SlewStep_LED) ) IREF_LED[7] = IREF_LED[7] + SlewStep_LED;else IREF_LED[7] = Iset_LED[7];//---------------------------------------------------------SlewError = (IREF_LED[8] - Iset_LED[8]);if (SlewError > SlewStep_LED) IREF_LED[8] = IREF_LED[8] - SlewStep_LED;else if (SlewError < (-SlewStep_LED) ) IREF_LED[8] = IREF_LED[8] + SlewStep_LED;else IREF_LED[8] = Iset_LED[8];//---------------------------------------------------------SerialHostComms(); //found in SciCommsGui.c//-------------------A_Task_Ptr = &A1; // To make task A3 active, change &A1 to &A3//-------------------}//-----------------------------------------void A3(void) // SPARE (not active)//-----------------------------------------{//-----------------A_Task_Ptr = &A1; // To make task A4 active, change &A1 to &A4//-----------------}//=================================================================================// B - TASKS//=================================================================================//----------------------------------- USER ----------------------------------------//----------------------------------------------------void B1(void) // SEPIC & Vin Dashboard measurements//----------------------------------------------------// Task runs every 10ms (CpuTimer1 period [5ms] * 2 "B" tasks active)// ADC samples are averaged over "HistPtr" samples and then scaled to real-world units// see LedCalculations.xls for how scaling was derived. {// Measurement code expandable to multiple channels, defined by "NumChannels"// Voltage measurement calculated by:// Gui_Vin = VinAvg * K_Vin, where VinAvg = sum of 8 VinR samples// Gui_Vout = VoutAvg * K_Vout, where VoutAvg = sum of 8 VoutR samples//HistPtr++;if (HistPtr >= HistorySize) HistPtr = 0;// BoxCar Averages - Input Raw samples into BoxCar arrays//----------------------------------------------------------------VsepicH[HistPtr] = VsepicR;IsepicH[HistPtr] = IsepicR;VinH[HistPtr] = VinR;// Sepic Measurements//----------------------------------------------------------------// view following variables in Watch Window as:// Gui_Vin = Q8// Gui_Vsepic = Q9// Gui_Isepic = Q?temp_Scratch=0;for(i=0; i<8; i++) temp_Scratch = temp_Scratch + VsepicH;Gui_Vsepic = ( (long) temp_Scratch * (long) K_Vsepic ) >> 15;temp_Scratch=0;for(i=0; i<8; i++) temp_Scratch = temp_Scratch + IsepicH;Gui_Isepic = ( (long) temp_Scratch * (long) K_Isepic ) >> 15;temp_Scratch=0;for(i=0; i<8; i++) temp_Scratch = temp_Scratch + VinH;Gui_Vin = ( (long) temp_Scratch * (long) K_Vin ) >> 15;Vtrgt = ( (long) Gui_VsetSepic * (long) iK_Vsepic ) >> 14;//-----------------B_Task_Ptr = &B2; //-----------------}//------------------------------------------------------------void B2(void) // LED Dashboard measurements//------------------------------------------------------------// Task runs every 10ms (CpuTimer1 period [5ms] * 2 "B" tasks active)// ADC samples are averaged over "HistPtr" samples and then scaled to real-world units// see LedCalculations.xls for how scaling was derived.{// LED String Measurements//----------------------------------------------------------------// view following variables in Watch Window as:// Gui_ILed[j] = Q15ILedH[1][HistPtr] = ILed2aR;ILedH[2][HistPtr] = ILed2bR;ILedH[3][HistPtr] = ILed3aR;ILedH[4][HistPtr] = ILed3bR;ILedH[5][HistPtr] = ILed4aR;ILedH[6][HistPtr] = ILed4bR;ILedH[7][HistPtr] = ILed5aR;ILedH[8][HistPtr] = ILed5bR;for(j = 0; j<9; j++){temp_Scratch=0;for(i=0; i<HistorySize; i++) temp_Scratch = temp_Scratch + ILedH[j];Gui_ILed[j] = ( (long) temp_Scratch * (long) K_ILed ) >> 15;Iset_LED[j] = ( (long) Gui_IsetLed[j] * (long) iK_ILed ) >> 14;}//-----------------B_Task_Ptr = &B1; //-----------------}//------------------------------------------------------------void B3(void) // SPARE (not active)//------------------------------------------------------------{//-----------------B_Task_Ptr = &B1;//-----------------}//=================================================================================// C - TASKS//=================================================================================//----------------------------- USER ----------------------------------------------//--------------------------------------------------------------void C1(void) // Coefficient update / control//--------------------------------------------------------------// Task runs every 100ms (CpuTimer2 period [50ms] * 2 "C" tasks active) // Allows user to dynamically change P, I, and D gains while the system is running.{// Coefficient Update for 1st (Ch1) LoopCoef2P2Z_Sepic[0] = Dgain_Sepic * 67108; // B2Coef2P2Z_Sepic[1] = (Igain_Sepic - Pgain_Sepic - Dgain_Sepic - Dgain_Sepic)*67108; // B1Coef2P2Z_Sepic[2] = (Pgain_Sepic + Igain_Sepic + Dgain_Sepic)*67108; // B0Coef2P2Z_LED[0] = Dgain_LED * 67108; // B2Coef2P2Z_LED[1] = (Igain_LED - Pgain_LED - Dgain_LED - Dgain_LED)*67108; // B1Coef2P2Z_LED[2] = (Pgain_LED + Igain_LED + Dgain_LED)*67108; // B0if (HRmode ==1) EPwm1Regs.HRCNFG.bit.EDGMODE = HR_FEP; // Enableelse EPwm1Regs.HRCNFG.bit.EDGMODE = HR_DISABLE;EDIS;//-----------------C_Task_Ptr = &C2; //-----------------}//----------------------------------------void C2(void) // Merging of LED controls & LED "life"-pulse//----------------------------------------// Task runs every 100ms (CpuTimer2 period [50ms] * 2 "C" tasks active) // Blinks an LED and allows all LED controls to be controlled individually or// as a group{// toggle an LED on the controlCARDGpioDataRegs.GPBTOGGLE.bit.GPIO34 = 1; // 1/(2*100ms) = 500Hz blink rateif (LEDs_linked == 1){for (i=1; i<9; i++){Gui_IsetLed = Gui_IsetLed[1];}}if ( (*ePWM[1]).TZFLG.bit.OST == 1 ){ FaultFlg = 1;}else{FaultFlg = 0;}//-----------------C_Task_Ptr = &C1; //-----------------}//--------------------------------------void C3(void) // SPARE (not active)//--------------------------------------{//-----------------C_Task_Ptr = &C1; //-----------------}[/code]       这个是代码，排除硬件的问题。单独在28035上跑这个代码的时候，28035的ADC A2输出的电压是0.5V。很奇怪为什么不是oV？作为输入管脚。当这个管脚接到模拟量的时候，程序中FaultFlag=1；这时候PWM被强制输出低电平。就是我上面说的情况。但是不我不接这个管脚 确不会出现这样的情况。

我用的ti的28035最小系统板， 28035的AD管脚都是接一个下拉电阻后悬空的。既然是输入端，运行AD采样程序的时候应该都是低电平吧？但不是。

我现在28035的最小系统上运行AD程序出现这样的情况：A7 0V A6  1.436V A5 0V A4 0.518V  A3 0.5V  A2 0.412V   A1 1.273V   A0 1.556V   ，我没加模拟量输入啊，还出现这样的情况？?   AD 的设置都是默认的，我原以为那些管脚没设置成输入，于是（28035AD采样的一个管脚比如说 ADC-A2/COMp1A/AIO2，我要设定成模拟量输入脚 ，）我这样GpioCtlRegs.AIOMUX1.bit.AIO2=2 ,这样不是把A2配置成模拟量输入管脚麽？我这样试了 还是不行。

是啊，很头疼！

我也是一名研究生，和楼主一样，一来学校就接触dsp，感觉也是一头雾水。一年半过去了，晕晕乎乎做了一套板，硬件测试过了没什么问题。现在用ti的代码调试程序，总是跑不通。折腾很长时间了很头疼。感觉自己dsp都还没怎么入门。今天看了楼主的经验分享，除了敬佩你，同时也给自己找回点了信心。向你学习！

你把RAM相邻的其它段地址长度改小点，再把减小的段地址放到RAM中。具体多大，根据你的扩展需要。