[讨论] 2812 ad采样中的断层现象

zxcvbnm_12345 2012-8-19 15:26 楼主

最近在做ad采集三相电压的项目，采集过来的数据graphy一下后发现，有的好像断了一样。

希望朋友们帮忙分析下
以下是代码：#include "DSP281x_Device.h"
#include "IQmathLib.h"

interrupt void Ad_intrpt_isr();

Uint16 count=1;
float ad_val[16],adclo=0.0;
float ad_sample[360];
Uint16 ad_num;
void main()
{
  InitSysCtrl();

  DINT;
  IER =0;
  IFR =0;
  InitPieCtrl();
  InitPieVectTable();

  EALLOW;
  PieVectTable.T1PINT=&Ad_intrpt_isr;
  EDIS;

  InitAdc();
  PieCtrlRegs.PIEIER2.bit.INTx4 =1; //enable T1PINT in PIE
  InitEv();
  EvaRegs.T1CON.bit.TENABLE =1;
  IER|=M_INT2;                         //enable CPU interrupt1
  EINT;                               //enable Global interrupt
  ERTM;
  /*while(AdcRegs.ADCST.bit.SEQ1_BSY==0)
      {

            AdcRegs.ADCTRL2.bit.SOC_SEQ1=1;

      }
      */
  for(;;);
}

interrupt void Ad_intrpt_isr()
{
  //IER= 0;
// PieCtrlRegs.PIEIFR1.all= 0;       //
//  count++;
      ad_val[0]=((float)AdcRegs.ADCRESULT0)*3.0/65520.0+adclo;
      ad_val[1]=((float)AdcRegs.ADCRESULT1)*3.0/65520.0+adclo;
      ad_val[2]=((float)AdcRegs.ADCRESULT2)*3.0/65520.0+adclo;
      ad_val[3]=((float)AdcRegs.ADCRESULT3)*3.0/65520.0+adclo;
      ad_val[4]=((float)AdcRegs.ADCRESULT4)*3.0/65520.0+adclo;
      ad_val[5]=((float)AdcRegs.ADCRESULT6)*3.0/65520.0+adclo;
      ad_val[6]=((float)AdcRegs.ADCRESULT7)*3.0/65520.0+adclo;
      ad_val[7]=((float)AdcRegs.ADCRESULT8)*3.0/65520.0+adclo;
      ad_val[8]=((float)AdcRegs.ADCRESULT9)*3.0/65520.0+adclo;
      ad_val[9]=((float)AdcRegs.ADCRESULT10)*3.0/65520.0+adclo;
      ad_val[10]=((float)AdcRegs.ADCRESULT11)*3.0/65520.0+adclo;
      ad_val[11]=((float)AdcRegs.ADCRESULT12)*3.0/65520.0+adclo;
      ad_val[12]=((float)AdcRegs.ADCRESULT13)*3.0/65520.0+adclo;
      ad_val[13]=((float)AdcRegs.ADCRESULT14)*3.0/65520.0+adclo;
      ad_val[14]=((float)AdcRegs.ADCRESULT15)*3.0/65520.0+adclo;
      ad_val[15]=((float)AdcRegs.ADCRESULT15)*3.0/65520.0+adclo;

      ad_sample[ad_num++]= ad_val[4];
      if(ad_num>=360)ad_num = 0;
  AdcRegs.ADCTRL2.bit.RST_SEQ1= 1;       //reset seq1 for new adc sequence
  AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 =1;
  AdcRegs.ADCTRL2.bit.SOC_SEQ1= 1;

  EvaRegs.EVAIFRA.bit.T1PINT =1;
  EvaRegs.EVAIMRA.bit.T1PINT =1;
  PieCtrlRegs.PIEACK.bit.ACK2 =1;

}

#define ADC_usDELAY  8000L
#define ADC_usDELAY2 20L

//---------------------------------------------------------------------------
// InitAdc:
//---------------------------------------------------------------------------
// This function initializes ADC to a known state.
void DSP28x_usDelay(Uint32 Count)
{
while(--Count);

}

void InitAdc(void)
{
  DSP28x_usDelay(1000000);

// To powerup the ADC the ADCENCLK bit should be set first to enable
// clocks, followed by powering up the bandgap and reference circuitry.
// After a 5ms delay the rest of the ADC can be powered up. After ADC
// powerup, another 20us delay is required before performing the first
// ADC conversion. Please note that for the delay function below to
// operate correctly the CPU_CLOCK_SPEED define statement in the
// DSP28_Examples.h file must contain the correct CPU clock period in
// nanoseconds. For example:
EALLOW;
      //ADC RESET
      AdcRegs.ADCTRL1.bit.RESET = 1;
//       asm("RPT #10||NOP"); //delay 12 nop
AdcRegs.ADCTRL1.bit.RESET = 0;

      //ADC上电
// DELAY_US(ADC_usDELAY);
      AdcRegs.ADCTRL3.bit.ADCBGRFDN = 3;       // Power up bandgap/reference circuitry
      DELAY_US(ADC_usDELAY);                // Delay before powering up rest of ADC
      AdcRegs.ADCTRL3.bit.ADCPWDN = 1;             // Power up rest of ADC
      DELAY_US(ADC_usDELAY2);                // Delay after powering up ADC
      AdcRegs.ADCTRL3.bit.ADCEXTREF = 0;

      //ADC时钟选择
AdcRegs.ADCTRL1.bit.CPS = 0;          //core clock prescale  一分频
      AdcRegs.ADCTRL3.bit.ADCCLKPS = 0x5;          //时钟分频器  对高速时钟分频

//AD 模式选择
      AdcRegs.ADCTRL1.bit.ACQ_PS = 0x03;          //S/H width in ADC model period
      AdcRegs.ADCTRL1.bit.CONT_RUN = 0;          //stop/start model
      AdcRegs.ADCTRL1.bit.SEQ_CASC = 1 ;             // casaded model 级联模式
      AdcRegs.ADCTRL1.bit.SUSMOD = 3 ;          //仿真器被挂起时，排序器和其他逻辑立即停止
      AdcRegs.ADCTRL3.bit.SMODE_SEL =0;          //顺序采样模式

      //ADC 通道选择
      AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x4;
      AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
      AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 1;
      AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 2;
      AdcRegs.ADCCHSELSEQ1.bit.CONV03 = 3;
      AdcRegs.ADCCHSELSEQ2.bit.CONV04 = 4;

      //ADC 启动模式/中断模式
      AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1;             //复位马上转到conv00
      AdcRegs.ADCTRL2.bit.EVA_SOC_SEQ1 = 1;
      AdcRegs.ADCTRL2.bit.EVB_SOC_SEQ = 0;
      AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1;
      AdcRegs.ADCTRL2.bit.INT_MOD_SEQ1 = 0;             //每隔SEQ1序列结束时，中断马上触发
AdcRegs.ADCTRL2.bit.SOC_SEQ1 = 1;                //软件触发排序，0清除排序
      AdcRegs.ADCTRL2.bit.SOC_SEQ2 = 0;                   //不开启排序器2
      EDIS;

}

#include "DSP281x_Device.h"    // DSP281x Headerfile Include File
#include "DSP281x_Examples.h" // DSP281x Examples Include File

//---------------------------------------------------------------------------
// InitEv:
//---------------------------------------------------------------------------
// This function initializes to a known state.
//
void InitEv(void)
{
  EvaRegs.T1CNT =0;
  EvaRegs.T1PR =0x0BB8;
  EvaRegs.T1CON.all =0x1042;

  EvaRegs.GPTCONA.all =0;

  EvaRegs.EVAIFRA.bit.T1PINT =1;
  EvaRegs.EVAIMRA.bit.T1PINT =1;

  EvaRegs.GPTCONA.bit.T1TOADC =2;
}