• State Resolved
  • Locked Locked
  • Replies 8 replies
  • Subscribers 80 subscribers
  • Views 2878 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADC in MSP430G2553

SANJEEV KUMAR GAUTAM
Prodigy 90 points

Other Parts Discussed in Thread: MSP430G2553, MSP430WARE

The code given below gives the reading of ADC10MEM at static level only and doesn't give the reading if the input is changes. I want it to be changed at every level i change the input. I am using potentiometer shows the output of particular level if I change the voltage then i have re run the code. Can anybody help.

#include "msp430g2553.h"
#include "intrinsics.h"
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // stop WDT


// ADC configuration,V+ref=3V,V-ref=0V,Channel=A0
ADC10CTL0 = ADC10ON + ADC10IE; // Vref Vr+=3v,Vr-=VSS,
// S&Htime = 4 X ADCCLK,ADC10 on,ADC interrupts enabled
ADC10CTL1 = ADC10DIV_7; // INCH =0000->A0,ADCCLK src = ADC10CLK,
// ADCCLK/8,Single Channel Single Conversion
ADC10AE0 = INCH_0; // channel A0

ADC10CTL0 |= ENC + ADC10SC; // Start Conversion

_BIS_SR(LPM0_bits +GIE); // Go to LPM0,interrupts enabled
}

/***************************************************************************/
/* interrupt vectors for MSP430 */
/***************************************************************************/

#pragma vector = ADC10_VECTOR
__interrupt void adc10_interrupt(void)
{
ADC10CTL0 |= ENC + ADC10SC; // Start Conversion again
}

 

  • 0
    Prodigy 250 points
    Hello,

    Following are the options to suffice your requirement :-

    1. Put your adc code in while loop
    2. Use timer in LPM 3 mode
    3. Use switch input in LPM 4 mode

    You can refer ADC, Timer and Switch examples. Also I would suggest you to use uart to print adc values which will make your life simple during testing.

    Regards
    Ayush J
  • 0
    Guru 74080 points
    Hi Sanjeev!

    In your code I cannot see that you read the ADC result. Or do you only look at the ADC10MEM register?

    Dennis
  • 0 in reply to Ayush Jain1
    Prodigy 90 points
    Can u please send me a link of an example so that i can understand it clearly.
  • 0 in reply to SANJEEV KUMAR GAUTAM
    Guru 46710 points

    SANJEEV KUMAR GAUTAM said:
    Can u please send me a link of an example so that i can understand it clearly.

    Here you go.

  • 0 in reply to SANJEEV KUMAR GAUTAM
    Prodigy 250 points
    You can refer examples from msp430ware. It is very good source for learning.
  • 0 in reply to Dennis Eichmann
    Prodigy 90 points
    sir i have used the code written below but it is not displaying my output on LCD can u help ASAP
    #include "msp430g2553.h"

    unsigned int ADC_value=0;

    void ConfigureAdc(void);

    void main(void)
    {

    WDTCTL = WDTPW + WDTHOLD; // Stop WDT
    BCSCTL1 = CALBC1_1MHZ; // Set range DCOCTL = CALDCO_1MHZ;
    BCSCTL2 &= ~(DIVS_3); // SMCLK = DCO = 1MHz
    P1SEL |= BIT3; // ADC input pin P1.3
    ConfigureAdc(); // ADC set-up function call
    __enable_interrupt(); // Enable interrupts.


    while(1)
    {
    __delay_cycles(1000); // Wait for ADC Ref to settle
    ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
    __bis_SR_register(CPUOFF + GIE); // Low Power Mode 0 with interrupts enabled
    ADC_value = ADC10MEM; // Assigns the value held in ADC10MEM to the integer called ADC_value

    }

    InitializeLcm();
    __delay_cycles(1000000);

    ClearLcmScreen();
    __delay_cycles(1000000);


    PrintStr(ADC_value);
    __delay_cycles(1000000);
    }

    // ADC10 interrupt service routine
    #pragma vector=ADC10_VECTOR
    __interrupt void ADC10_ISR (void)
    {
    __bic_SR_register_on_exit(CPUOFF); // Return to active mode }
    }

    // Function containing ADC set-up
    void ConfigureAdc(void)
    {

    ADC10CTL1 = INCH_3 + ADC10DIV_3 ; // Channel 3, ADC10CLK/3
    ADC10CTL0 = SREF_0 + ADC10SHT_3 + ADC10ON + ADC10IE; // Vcc & Vss as reference, Sample and hold for 64 Clock cycles, ADC on, ADC interrupt enable
    ADC10AE0 |= BIT3; // ADC input enable P1.3
    }
  • 0 in reply to Ilmars
    Prodigy 90 points
    can u also send me the codes of GSM and LCD module. thanks in advance.
  • 0 in reply to SANJEEV KUMAR GAUTAM
    Guru 46710 points

    No I cant. Note that code I provided is made by TI. Try to use search on forum or just google

**Attention** This is a public forum