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Reading from multiple channel using ADC12.

B2 Khat
Prodigy 85 points
Other Parts Discussed in Thread: MSP430F5529

#include <msp430.h>
#include <stdio.h>
float volt_hex, volt_hex1, volt_hex2;
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
ADC12CTL0 = ADC12ON + ADC12MSC ; // Sampling time, ADC12 on
ADC12CTL1 = 0x7000+ADC12SHP + ADC12CONSEQ_1; // Sample and Hold Mode
ADC12IE = 0x80; // Enable interrupt for channel 7
ADC12MCTL0 |= ADC12INCH_0;
ADC12MCTL1 |= 0x07 + ADC12EOS;
P6SEL |= 0x70; // P6.7 ADC option select
P6DIR &= 0x7F;
P1DIR |= BIT0;
P6SEL = 0X01; //P6.0 ADC option select
P1DIR |= 0x01; // P1.0 output

while(1)
{
ADC12CTL0 |= ADC12ENC; //Enable conversion
ADC12CTL0 |= ADC12SC; // start conversion
__bis_SR_register(LPM0_bits | GIE); // Enter Low Power Mode 0 + Global Interrupt Enable
}
}
// ADC ISR
#pragma vector = ADC12_VECTOR
__interrupt void ADC12_ISR(void)
{
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:break; // Vector 6: ADC12IFG0
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:
volt_hex1 = ADC12MEM1; // Read converted value for channel 7. This clears the interrupt flag
volt_hex2 = ADC12MEM7;

volt_hex = volt_hex1 - volt_hex2;

__bic_SR_register_on_exit(LPM0_bits); // Quit Low Power Mode 0 on exit to enable CPU for next Start Conversion operation
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;
}
}

  • 0
    Prodigy 85 points
    I am using MSP430F5529 build in LCD launchpad. I am new to this micro-controller. I have two sensors and need to find the difference of the two sensors by inputting it to experimental board. So far I am getting exact reading from one sensor that I connected into pin 6.7. I am trying to get another pin reading from the other sensor. I know it can't read from both sensor at same time. I need to put delay, but i don't know where to put the delay and don't know too how to find another pin that can get an input similar like to pin 6.7. It will be helpful if someone would assist me to figure out my mistake from the above code as well as point out how I can use another pin (for the second sensor reading) as well as where to put the delay. Please help me.
  • 0 in reply to B2 Khat
    Guru 46710 points

    You shall try source code examples which are available in the product page of nearly every msp. Example MSP430F55xx_adc_08.c is one you would want to look at.

  • 0 in reply to Ilmars
    Prodigy 85 points
    Thanks for replying. I try that many time by putting different input pin, but can't find any pin that gave the actual reading on msp430 board. Can you please help me, in which pin should i have to put input ? They talk about channel A8 and A9, what are this channel pin that I can put input?
  • 0 in reply to B2 Khat
    Guru 46710 points

    Sorry, example I mention is not best choice for you. Better try MSP430F55xx_adc_06.c which uses 4 inputs, P6.0 to P6.3. Those are wired to LaunchPad I/O header, please refer to slau533, "Figure 23. F5529 LaunchPad to BoosterPack Connector Pinout"

  • 0 in reply to Ilmars
    Prodigy 85 points

    Thank you for replying. it's okay. I try the code you mention already but, I am using  build in LCD MSP430F5529 experimental board which   doesn't have the pin P6.0 to P6.3. I try using other pin by changing the channel it's not working. Please help me finding the right pin because I have spent more then three weeks trying to find it. Only hope for me is TI-forum about finding right solution.  I am getting one ADC12 conversion by uisng below code from pin6.7.

    WDTCTL = WDTPW + WDTHOLD; // Stop WDT
    ADC12CTL0 = ADC12ON; // Sampling time, ADC12 on
    ADC12CTL1 = 0x7000 + ADC12SHP; // Sample and Hold Mode
    ADC12IE = 0x80; // Enable interrupt for channel 7
    ADC12MCTL7 |= 0x07;

    But I try changing the code and used different pin but, it's not showing any reading on LCD. Please help me.....

     

     

  • 0 in reply to B2 Khat
    Guru 46710 points

    > board which doesn't have the pin P6.0 to P6.3
    Then which P6 port pins _are_ there?

    >But I try changing the code and used different pin but, it's not showing any reading on LCD
    Are you able to measure and display internal channels like VCC divider or thermistor?

    I am not sure that you are following source code example I suggested:

    B2 Khat said:
    WDTCTL = WDTPW + WDTHOLD; // Stop WDT
    ADC12CTL0 = ADC12ON; // Sampling time, ADC12 on
    ADC12CTL1 = 0x7000 + ADC12SHP; // Sample and Hold Mode
    ADC12IE = 0x80; // Enable interrupt for channel 7
    ADC12MCTL7 |= 0x07;

    It is not that ieasy to convert MSP430F55xx_adc_06.c to other ADC inputs, you shall just use your head.

  • 0 in reply to Ilmars
    Prodigy 85 points


    #include <msp430.h>

    int main(void)
    {
    WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
    ADC12CTL0 = ADC12ON+ADC12MSC+ADC12SHT0_15;// Turn on ADC12, set sampling time
    ADC12CTL1 = ADC12SHP+ADC12CONSEQ_1; // Use sampling timer, single sequence
    ADC12MCTL0 = ADC12INCH_7; // ref+=AVcc, channel = A7, pin 6.7
    ADC12MCTL1 = ADC12INCH_9+ADC12EOS; // ref+=AVcc, channel = A9, pin 5.1 end seq.
    ADC12IE = 0x02; // Enable ADC12IFG.1, end channel
    ADC12CTL0 |= ADC12ENC; // Enable conversions

    while(1)
    {
    ADC12CTL0 |= ADC12SC; // Start convn - software trigger

    __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
    {
    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: break; // Vector 6: ADC12IFG0
    case 8: // Vector 8: ADC12IFG1
    float volt1 = ADC12MEM0; // Move results, IFG is cleared
    float volt2 = ADC12MEM1; // Move results, IFG is cleared
    __bic_SR_register_on_exit(LPM4_bits); // Exit active CPU, SET BREAKPOINT HERE
    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;
    }
    }

    Actually I used my head many time, but it's not working. The code seems working but it's not giving actual reading in LCD board. I know the input pins are correct as per the manual. I believe we need to use delay to get simultaneously sampling reading. Can any one help doing it. 

    Thanks

  • 0 in reply to B2 Khat
    Guru 46710 points

    B2 Khat said:
    Actually I used my head many time, but it's not working.

    Good. You init sequence to read A7 and A9 channels, but wait for interrupt from A0 and A1 channels, read from A0 and A1 channel result registers. Of course interrupts of A0 and A1 never arrive, thus ADC channels most probably are measured but results are never read out of corresponding registers.

    You shall process ADC12IFG7 and ADC12IFG9 interrupts instead, read from ADC12MEM7 and ADC12MEM9.

  • 0 in reply to Ilmars
    Prodigy 85 points 
    #include <msp430.h>
#include "HAL_Dogs102x6.h"
#include <stdio.h>
#include <stdlib.h>

float volt_hex1, volt_hex2;

int main(void)
{
    WDTCTL = WDTPW+WDTHOLD;                   // Stop watchdog timer
  ADC12CTL0 = ADC12ON+ADC12MSC+ADC12SHT0_15;// Turn on ADC12, set sampling time
  ADC12CTL1 = ADC12SHP+ADC12CONSEQ_1;       // Use sampling timer, single sequence
  ADC12MCTL6 = ADC12INCH_6;                 // ref+=AVcc, channel = A6, pin 6.6
  ADC12MCTL7 = ADC12INCH_7+ADC12EOS;        // ref+=AVcc, channel = A7,pin 6.7 end seq.
  ADC12IE = 384;                           // Enable (ADC12IFG.7 + ADC12IFG.6)= 256+384, end channel

  while(1)
  {
	  ADC12CTL0 |= ADC12ENC;                    // Enable conversions
      ADC12CTL0 |= ADC12SC;                   // Start convn - software trigger

    __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
{
  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: break;                           // Vector  6:  ADC12IFG0
  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:                           // Vector 20:  ADC12IFG7
         volt_hex1 = ADC12MEM6;                 // Move results, IFG is cleared
         volt_hex2 = ADC12MEM7;                 // Move results, IFG is cleared
         __bic_SR_register_on_exit(LPM4_bits);  // Quit Low Power Mode 0 on exit to enable CPU for next Start Conversion operation

             // break;
  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;
  }
}

  • 0 in reply to B2 Khat
    Prodigy 85 points
    I am getting an accurate reading from channel 7, though not from channel 6. I believe it might have to do with the interrupt call for channel 6 being called incorrectly. I have tried different variations of the code insert shown in this post and haven't been successful in getting channel 6 to output. If someone can please point out my mistake or indicate which line I need to add code to, it would be greatly appreciated.

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