test44x_adc12_05.c

AQ430 C Code,支持LSD-TEST430F44X

#include          "msp430x44x.h" // Standard Equations

#define   Num_of_Results   8

static unsigned int A0results[Num_of_Results];  // These need to be global in 
static unsigned int A1results[Num_of_Results];  // this example. Otherwise, the 
static unsigned int A2results[Num_of_Results];  // compiler removes them because
static unsigned int A3results[Num_of_Results];  // they are not used

void main(void)
{ 
  WDTCTL = WDTPW+WDTHOLD;               // Stop watchdog timer
  P6SEL = 0x0F;                         // Enable A/D channel inputs
  ADC12CTL0 = ADC12ON+MSC+SHT0_8;       // Turn on ADC12, extend sampling time
                                        // to avoid overflow of results
  ADC12CTL1 = SHP+CONSEQ_3;             // Use sampling timer, repeated sequence
  ADC12MCTL0 = INCH_0;                  // ref+=AVcc, channel = A0
  ADC12MCTL1 = INCH_1;                  // ref+=AVcc, channel = A1
  ADC12MCTL2 = INCH_2;                  // ref+=AVcc, channel = A2    
  ADC12MCTL3 = INCH_3+EOS;              // ref+=AVcc, channel = A3, end seq.
  ADC12IE = 0x08;                       // Enable ADC12IFG.3
  ADC12CTL0 |= ENC;                     // Enable conversions
  _EINT();                              // Enable interrupts  
  ADC12CTL0 |= ADC12SC;                 // Start conversion
  _BIS_SR(LPM0_bits);                   // Enter and stay in LPM0 
}

interrupt[ADC_VECTOR] void ADC12ISR (void)
{
  static unsigned int index = 0;
  
  A0results[index] = ADC12MEM0;         // Move A0 results, IFG is cleared
  A1results[index] = ADC12MEM1;         // Move A1 results, IFG is cleared
  A2results[index] = ADC12MEM2;         // Move A2 results, IFG is cleared    
  A3results[index] = ADC12MEM3;         // Move A3 results, IFG is cleared  
  index = (index+1)%Num_of_Results;     // Increment results index, modulo
}