Reg - MSP430 ADC SW Support

Hi Ryan,

Thanks for your reply.

TI have any MSP430 example code for ADC repeated conversion configured with internal reference. 

Thanks

Sathiyan

#include <msp430.h>

#define Num_of_Results 8

volatile unsigned int results[Num_of_Results];
// Needs to be global in this
// example. Otherwise, the
// compiler removes it because it
// is not used for anything.

int main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P6SEL |= 0x01; // Enable A/D channel A0
ADC12CTL0 = ADC12ON+ADC12SHT0_8+ADC12MSC+ADC12REFON+ADC12REF2_5V; // Turn on ADC12, set sampling time
// set multiple sample conversion
ADC12CTL1 = ADC12SHP+ADC12CONSEQ_2; // Use sampling timer, set mode
ADC12IE = 0x01; // Enable ADC12IFG.0
ADC12CTL0 |= ADC12ENC; // Enable conversions
ADC12CTL0 |= ADC12SC; // Start conversion

__bis_SR_register(LPM4_bits + GIE); // Enter LPM4, Enable interrupts
__no_operation(); // For debugger

}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(ADC12_VECTOR))) ADC12ISR (void)
#else
#error Compiler not supported!
#endif
{
static unsigned char index = 0;

switch(__even_in_range(ADC12IV,34))
{
case 0: break; // Vector 0: No interrupt
case 2: break; // Vector 2: ADC overflow
case 4: break; // Vector 4: ADC timing overflow
case 6: // Vector 6: ADC12IFG0
results[index] = ADC12MEM0; // Move results
index++; // Increment results index, modulo; Set Breakpoint1 here
if (index == 8)
{
index = 0;
}
case 8: break; // Vector 8: ADC12IFG1
case 10: break; // Vector 10: ADC12IFG2
case 12: break; // Vector 12: ADC12IFG3
case 14: break; // Vector 14: ADC12IFG4
case 16: break; // Vector 16: ADC12IFG5
case 18: break; // Vector 18: ADC12IFG6
case 20: break; // Vector 20: ADC12IFG7
case 22: break; // Vector 22: ADC12IFG8
case 24: break; // Vector 24: ADC12IFG9
case 26: break; // Vector 26: ADC12IFG10
case 28: break; // Vector 28: ADC12IFG11
case 30: break; // Vector 30: ADC12IFG12
case 32: break; // Vector 32: ADC12IFG13
case 34: break; // Vector 34: ADC12IFG14
default: break;
}
}

Tell me Ryan now whether it is corrected now.

I tested this code but giving wrong count.

Hi Ryan,

I am giving ADC Input from PWS2326 DC Power Supply (0 to 2.5V).

Thanks

Sathiyan

The following code worked as expected on my MSP-EXP430F5529:

#include <msp430.h>

#define   Num_of_Results   8

volatile unsigned int results[Num_of_Results];
                                            // Needs to be global in this
                                            // example. Otherwise, the
                                            // compiler removes it because it
                                            // is not used for anything.

int main(void)
{
  WDTCTL = WDTPW+WDTHOLD;                   // Stop watchdog timer
  P6SEL |= 0x01;                            // Enable A/D channel A0
  REFCTL0 &= ~REFMSTR;
  ADC12CTL0 = ADC12ON+ADC12SHT0_8+ADC12MSC+ADC12REFON+ADC12REF2_5V; // Turn on ADC12, set sampling time
                                            // set multiple sample conversion
  ADC12CTL1 = ADC12SHP;                     // Use sampling timer
  ADC12MCTL0 = ADC12SREF_1;                 // Vr+=Vref+ and Vr-=AVss
  ADC12CTL1 = ADC12SHP+ADC12CONSEQ_2;       // Use sampling timer, set mode
  ADC12IE = 0x01;                           // Enable ADC12IFG.0
  ADC12CTL0 |= ADC12ENC;                    // Enable conversions
  ADC12CTL0 |= ADC12SC;                     // Start conversion

  __bis_SR_register(LPM4_bits + GIE);       // Enter LPM4, Enable interrupts
  __no_operation();                         // For debugger

}


#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(ADC12_VECTOR))) ADC12ISR (void)
#else
#error Compiler not supported!
#endif
{
  static unsigned char index = 0;

  switch(__even_in_range(ADC12IV,34))
  {
  case  0: break;                           // Vector  0:  No interrupt
  case  2: break;                           // Vector  2:  ADC overflow
  case  4: break;                           // Vector  4:  ADC timing overflow
  case  6:                                  // Vector  6:  ADC12IFG0
    results[index] = ADC12MEM0;             // Move results
    index++;                                // Increment results index, modulo; Set Breakpoint1 here

    if (index == 8)
    {
      index = 0;
    }
  case  8: break;                           // Vector  8:  ADC12IFG1
  case 10: break;                           // Vector 10:  ADC12IFG2
  case 12: break;                           // Vector 12:  ADC12IFG3
  case 14: break;                           // Vector 14:  ADC12IFG4
  case 16: break;                           // Vector 16:  ADC12IFG5
  case 18: break;                           // Vector 18:  ADC12IFG6
  case 20: break;                           // Vector 20:  ADC12IFG7
  case 22: break;                           // Vector 22:  ADC12IFG8
  case 24: break;                           // Vector 24:  ADC12IFG9
  case 26: break;                           // Vector 26:  ADC12IFG10
  case 28: break;                           // Vector 28:  ADC12IFG11
  case 30: break;                           // Vector 30:  ADC12IFG12
  case 32: break;                           // Vector 32:  ADC12IFG13
  case 34: break;                           // Vector 34:  ADC12IFG14
  default: break;
  }
}

Make sure that the GND of your DC power supply is also connected.

Regards, Ryan

Thanks Ryan I will Test.