adc.c

一个变频器的代码,用msp430就能实现.低成本,可靠性也不错.

 #include "def.h" 
struct STRADC adc;
extern struct STRWORK work;
extern void savemsg( unsigned char msgtype, unsigned char msgcode);
void Init_ADC(void);
void DealADC(void);
void diandu(void);
//******************************************************************
void Init_ADC(void)
  {
    // P6SEL = 0xc0;         // Pin P6.6 p6.7 used by ADC module

     ADC12CTL0 &=~ 0x02;   // Disable conversion before changing
                           // the ADC12 settings!!!
                        /* selection of reference and input */
    // ADC12MCTL0  = 0x13;    // Ref = AVss, AVcc; Input = A3  
   //  ADC12MCTL1  = 0x14;    // Ref = AVss, AVcc; Input = A4
     ADC12MCTL0  = 0x16;    // Ref = AVss, AVcc; Input = A6
     ADC12MCTL1  = 0x17+0x80;    // Ref = AVss, AVcc; Input = A7
        
     ADC12CTL1 = 0x0202;    // first conv. result is stored in ADC12MEM0
                //0x0272    // ADC12SC bit triggers Sample&Hold
                            // sample pulse is generated by Sampling Timer
                            // Clock Source: ADC12 internal oscillator
                            // Clock divider: 1
                            // conversion mode: one single sequence
 

     ADC12CTL0 = 0x03f0;    // Sample&Hold Time 0
                 //0x03f0   // Sample&Hold Time 1 
                            // Multiple Sample&Hold 
                            // reference voltage is off
                            // ADC12 module is switched on 
                            // no interrupts
     ADC12IE = 0x0002;      // enable all ADC interrupts                      
     ADC12CTL0 |= 0x02;     // enable conversion
}
//-----------------------------------------------------------
interrupt [ADC_VECTOR] void ADC12(void)   // ADC INTERRUPT HANDLER //50hz
{  
  unsigned int temp[8];
  static unsigned int number;
  static unsigned char hivnum;
  ADC12IFG=0;//clear interrupt source
  temp[0]=ADCMEM[0];//V
  temp[1]=ADCMEM[1];//i
  adc.Vtemp=temp[0];
  adc.Itemp=temp[1];
  if(adc.Vtemp>ConInV)
     {
     if(hivnum<25)hivnum++;
     }
   else
      {
      if(hivnum>0)hivnum--;
      }
  if((hivnum>20)&&(work.invert==OFF))
    {
    setOUT1;
    setOUT2;
    work.invert=ON;
    }
  if((hivnum<2)&&(work.invert==ON))
    {
    clrOUT1;
    clrOUT2;
    work.invert=OFF;
    }
           
  number++;
  if(number>800)
    {
    savemsg(DEALADC,DEALADC);
    number=0;
    }
  }
void DealADC(void)
{
 unsigned long int ltemp;
/// k=0.001245 b=-0.138  vpk=0.0996 vpb=-11.04  ipk=0.0249 ipb=-2.76
ltemp=adc.Vtemp;
ltemp=ltemp*996-110000;
ltemp=ltemp/1000;
adc.Vadc=ltemp;

ltemp=adc.Itemp;
ltemp=ltemp*249-27600;
ltemp=ltemp/1000;
adc.Iadc=ltemp;

ltemp=ltemp*adc.Vadc;
ltemp=ltemp/10000;
adc.gonglv=ltemp;
}
void diandu(void)
{
adc.gongdu=adc.gongdu+(adc.gonglv/60);
}