为什么28335ad输入寄存器里总是衡量没有随着我的输入改变...

只看该作者 · 2016-9-8 15:45

各位大神请问一下你们
这是我的程序我就用了一路输入A0，然后dsp28335  ADCINA0引脚上加上一个输入电压给A0  寄存器显示依然是那个衡量大概2000左右换算成电压就是1.5V。如果先输入电压在链接dsp的话又都是杂乱数据不知道为什么？求大神指导，程序应该没什么问题。

#include "DSP2833x_Device.h"    // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File

// Determine when the shift to right justify the data takes place
// Only one of these should be defined as 1.
// The other two should be defined as 0.
#define POST_SHIFT 0  // Shift results after the entire sample table is full
#define INLINE_SHIFT 1  // Shift results as the data is taken from the results regsiter
#define NO_SHIFT    0  // Do not shift the results

// ADC start parameters
#if (CPU_FRQ_150MHZ)    // Default - 150 MHz SYSCLKOUT
  #define ADC_MODCLK 0x3 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz
#endif
#if (CPU_FRQ_100MHZ)
  #define ADC_MODCLK 0x2 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 100/(2*2) = 25.0 MHz
#endif
#define ADC_CKPS 0x0 // ADC module clock = HSPCLK/1    = 25.5MHz/(1) = 25.0 MHz
#define ADC_SHCLK  0x1 // S/H width in ADC module periods                = 2 ADC cycle
#define AVG       1000  // Average sample limit
#define ZOFFSET 0x00  // Average Zero offset
#define BUF_SIZE 256  // Sample buffer size

// Global variable for this example
Uint16 SampleTable[BUF_SIZE];
float SampleValue[BUF_SIZE];

main()
{
Uint16 i;
Uint16 j,k;
Uint16 array_index;

InitSysCtrl();

EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;

// EALLOW;
// GpioCtrlRegs.GPBMUX2.bit.GPIO61 = 0; // GPIO61 = GPIO61
//  GpioCtrlRegs.GPBDIR.bit.GPIO61 = 1;
//  EDIS;

DINT;

InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
IER = 0x0000;
IFR = 0x0000;

InitPieVectTable();

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

// Specific ADC setup for this example:
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;  // Sequential mode: Sample rate = 1/[(2+ACQ_PS)*ADC clock in ns]

AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;       // 1  Cascaded mode
AdcRegs.ADCTRL1.bit.CONT_RUN = 1;       // Setup continuous run
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x0;  // convert and store in 8 results registers
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;    // Enable Sequencer override feature
//  AdcRegs.ADCCHSELSEQ1.bit.conv00 = 0x00;
AdcRegs.ADCCHSELSEQ1.all = 0x00;
// AdcRegs.ADCCHSELSEQ2.all = 0x00;
// AdcRegs.ADCCHSELSEQ3.all = 0x00;
// AdcRegs.ADCCHSELSEQ4.all = 0x00;

// Clear SampleTable
for (i=0; i<BUF_SIZE; i++)
{
   SampleTable[i] = 0;

}

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

for(;;)
{  //Take ADC data and log them in SampleTable array

array_index = 0;
     for (i=0; i<(BUF_SIZE); i++)
     {
   while (AdcRegs.ADCST.bit.INT_SEQ1== 0){}
//          GpioDataRegs.GPBDAT.bit.GPIO61 = 1;  // Set GPIO61 for monitoring  -optional

   AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;

   SampleTable[array_index]= ( (AdcRegs.ADCRESULT0)>>4);
SampleValue[array_index] = SampleTable[array_index]*3.0/4096;
array_index++;
   for(j=0;j<100;j++)
        k++;
//         GpioDataRegs.GPBDAT.bit.GPIO61 = 0;  // Clear GPIO61 for monitoring  -optional
     }
    }
}