TMS320F28335: 不管ADC引脚接多少V，读回的值一直是2300，15个ADC口都这样。这是怎么回事呢，芯片还是新买的。

void ADC_Init(void){
    EALLOW;
    SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1; // Enable ADC clock
    SysCtrlRegs.HISPCP.all = 3; // ADC: 25MHZ

    InitAdc();  // provide by TI

  //  AdcRegs.ADCTRL3.all = 0x00E0;

    AdcRegs.ADCTRL1.bit.ACQ_PS = 0x0F; // sequential sampling
    AdcRegs.ADCTRL3.bit.ADCCLKPS = 1; // 25Mhz no frequency division
    AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; // 1:  Cascaded sequencer mode    0:double sort mode
    AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;// 1:Synchronous sampling     0:sequential sampling
    AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; // A0 as the sample channel  save data to results0
    AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1; // A1 as the sample channel  save data to results1
    AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2; // A2 as the sample channel  save data to results2
    AdcRegs.ADCCHSELSEQ1.bit.CONV03 = 0x3; // A3 as the sample channel  save data to results3
    AdcRegs.ADCCHSELSEQ2.bit.CONV04 = 0x4; // A4 as the sample channel  save data to results4
    AdcRegs.ADCCHSELSEQ2.bit.CONV05 = 0x5; // A4 as the sample channel  save data to results4
    AdcRegs.ADCCHSELSEQ2.bit.CONV06 = 0x6; // A4 as the sample channel  save data to results4
    AdcRegs.ADCCHSELSEQ2.bit.CONV07 = 0x7; // A4 as the sample channel  save data to results4
    AdcRegs.ADCCHSELSEQ3.bit.CONV08 = 0x8; // B0 as the sample channel save data to results5
    AdcRegs.ADCCHSELSEQ3.bit.CONV09 = 0x9; // B0 as the sample channel save data to results5
    AdcRegs.ADCCHSELSEQ3.bit.CONV10 = 0xA; // B0 as the sample channel save data to results5
    AdcRegs.ADCCHSELSEQ3.bit.CONV11 = 0xB; // B0 as the sample channel save data to results5
    AdcRegs.ADCCHSELSEQ4.bit.CONV12 = 0xC; // B0 as the sample channel save data to results5
    AdcRegs.ADCCHSELSEQ4.bit.CONV13 = 0xD; // B0 as the sample channel save data to results5
    AdcRegs.ADCCHSELSEQ4.bit.CONV14 = 0xE; // B0 as the sample channel save data to results5
    AdcRegs.ADCCHSELSEQ4.bit.CONV15 = 0xF; // B0 as the sample channel save data to results5

    //AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x02; // A2 as the sample channel
    AdcRegs.ADCTRL1.bit.CONT_RUN = 1; // continuous sampling
    AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0xF;  // max sample channel, CONV05 have used , so it should be 5. but actully, only two channel working. Cascaded mode max 15, double sort max 7;
    //AdcRegs.ADCMAXCONV.bit.MAX_CONV2 = 0xf;  // max sample channel, case only A0 is used , so 0x0;
    AdcRegs.ADCTRL2.all = 0x2000;   //software trigger

    EDIS;
}

Uint16 Read_ADCValueResult0(void){
    while(AdcRegs.ADCST.bit.INT_SEQ1 == 0);     // wait the end of the translation
    AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;     //clear interrupt flag
    return AdcRegs.ADCRESULT0>>4;   //return translate results, high 12bits valid, low 4bits invalid
}