28335ADC配置

只看该作者 · 2014-8-11 10:30

28335的AD如何配置呀我从例程ADC的程序把通道ADCIN0 改成到了ADCIN1后没有转化数据出现，如何做
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]
                        //                   = 1/(3*40ns) =8.3MHz (for 150 MHz SYSCLKOUT)
          //                   = 1/(3*80ns) =4.17MHz (for 100 MHz SYSCLKOUT)
          // If Simultaneous mode enabled: Sample rate = 1/[(3+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.ADCTRL1.bit.ADCBSYCHN =
   AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;    // Enable Sequencer override feature
   AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x01;
   AdcRegs.ADCCHSELSEQ2.all = 0x0;
   AdcRegs.ADCCHSELSEQ3.all = 0x0;
   AdcRegs.ADCCHSELSEQ4.all = 0x0;
   AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x1;
   AdcRegs.ADCTRL2.all = 0x2000;

   scic_fifo_init();    // Initialize the SCI FIFO
      scic_echoback_init();  // Initalize SCI for echoback

      msg = "\r\n\n\nHello World!\0";
      scic_msg(msg);

      msg = "\r\nIf you change the ADC Res,we will give you the value! \n\0";
      scic_msg(msg);
// Enable global Interrupts and higher priority real-time debug events:
//EINT; // Enable Global interrupt INTM
// ERTM; // Enable Global realtime interrupt DBGM
i = 0;
for(; ;)
{
// LED_pulse();
PM2_5_reg = ~0x40;
DELAY_US(260);

while(AdcRegs.ADCST.bit.INT_SEQ1 == 0);
AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;
   ADCValue[0] = ( (AdcRegs.ADCRESULT0) >>4);
   PMvalue = ADCValue[0];

   // PMvalue = ((double)PMvalue /4096) *3*3/2;
   //  PMvalue = (PMvalue-0.0356)*120000 * 0.127 -0.0999;
   sprintf(cbuf,"tne PM2.5 is %d\n",ADCValue[0]);

DELAY_US(20);
PM2_5_reg = 0x40;
DELAY_US(9680);
DELAY_US(200000);
scic_msg(cbuf);