如何设置DSP28335的AD采集电压时的采样频率为25KHZ？

如何设置DSP28335的AD采集电压时的采样频率为25KHZ，本起动AD采样的触发方式为软件触发？

void ADC_Init(void)
{
    // Specific clock setting for this example:
    EALLOW;
    SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1;    // ADC
    EDIS;

    // Specific clock setting for this example:
    EALLOW;
    SysCtrlRegs.HISPCP.all = ADC_MODCLK;    // HSPCLK = SYSCLKOUT/(2*ADC_MODCLK)
    EDIS;

    InitAdc();  // For this example, init the ADC

    // Specific ADC setup for this example:
    AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
    AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
    AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;        // 1  Cascaded mode
    AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0;
    AdcRegs.ADCTRL1.bit.CONT_RUN = 1;       // Setup continuous run
    AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x0;

    // Start SEQ1
    AdcRegs.ADCTRL2.all = 0x2000;

}

Uint16 Read_ADCValue(void)
{
    while (AdcRegs.ADCST.bit.INT_SEQ1== 0);
    AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;
    return AdcRegs.ADCRESULT0>>4;
}

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