msp430 adc pin configuration

Hari Nagarajan

Other Parts Discussed in Thread: MSP430G2231

hi,

I am using msp430g2231. i am very new to this. I am trying the programs given in the sample program list. I am trying the adc program. There are 7 pins for analog in the launch pad. can someone say me which pin is configured as adc pin in the given adc program and also say how to configure an adc pin.

cheers,

Hari

over 14 years ago

0 BrandonAzbell over 14 years ago

TI__Guru 64920 points

What example are you referencing? You haven't cited a name or the zip file archive you are using. This makes it difficult for anyone to speculate on which ADC channel input is being used.

Secondly, I would suggest you familiarize yourself with the MSP430G2231 datasheet and MSP430x2xx Family User's Guide, both found on the MSP430G2231 Product Folder.

I would also suggest you utlize the Launchpad Wiki Portal on the TI Embedded Processing wiki site. A link to this site is also found on the MSP430G2231 Product Folder in the Support and Community section.

0 Hari Nagarajan over 14 years ago in reply to BrandonAzbell

Prodigy 90 points

i am referring adc example in the example programs list. i am using a 14 pin ic.

heres the coding:

/*#include <msp430g2231.h>

volatile long tempRaw;

void FaultRoutine(void);

void main(void)

{

WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer

P1DIR = 0x41; // P1.0 & 6 outputs

P1OUT = 0; // LEDs off

if (CALBC1_1MHZ ==0xFF || CALDCO_1MHZ == 0xFF)

FaultRoutine(); // If cal data is erased

// run FaultRoutine()

BCSCTL1 = CALBC1_1MHZ; // Set range

DCOCTL = CALDCO_1MHZ; // Set DCO step + mod

BCSCTL3 |= LFXT1S_2; // LFXT1 = VLO

IFG1 &= ~OFIFG; // Clear OSCFault flag

BCSCTL2 |= SELM_0 + DIVM_3 + DIVS_3; // MCLK=DCO/8,SMCLK=DCO/8

while(1)

{

ADC10CTL1 = INCH_1 + ADC10DIV_0; // Temp Sensor ADC10CLK

ADC10CTL0 = SREF_1 + REF2_5V + ADC10SHT_3 + REFON + ADC10ON;

_delay_cycles(5); // Wait for Ref to settle

ADC10CTL0 |= ENC + ADC10SC; // Samp and convert start

P1OUT = 0x40; // P1.6 on (green LED)

_delay_cycles(100); // Wait for conversion

ADC10CTL0 &= ~ENC; // Disable ADC conversion ADC10CTL0 &= ~(REFON + ADC10ON); // Ref and ADC10 off

tempRaw = ADC10MEM; // Read conversion value

P1OUT = 0; // green LED off

_delay_cycles(125000); // delay 1 second

}

void FaultRoutine(void)

{

P1OUT = 0x01; // red LED on

while(1); // TRAP

}

/*#include <msp430g2231.h>

unsigned int res[2]; //for holding the conversion results

void main (void)

{

//code for connecting to AP

//reading voltage

WDTCTL = WDTPW + WDTHOLD; // Stop WDT

ADC10CTL1 = INCH_2 + CONSEQ_1; // A2/A1/A0, once multi channel

ADC10CTL0 = REF2_5V + ADC10SHT_2 + MSC + REFON + ADC10ON + ADC10IE; //2.5 reference voltage

ADC10AE0 = 0x6; // P1.1,2 ADC option select

ADC10DTC1 = 0x2; // 2 conversions

P1DIR |= 0x01; // Set P1.0 output

for (;;)

{

P1OUT |= 0x01; // Set P1.0 LED on

ADC10CTL0 &= ~ENC;

while (ADC10CTL1 & BUSY); // Wait if ADC10 core is active

ADC10SA = (int)res; // Data buffer start

ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion ready

__bis_SR_register(CPUOFF + GIE); // LPM0, ADC10_ISR will force exit

P1OUT &= ~0x01; // Clear P1.0 LED off

}

#pragma vector=ADC10_VECTOR

__interrupt void ADC10_ISR(void)

{

//code from reading from res and sending it to AP

__bic_SR_register_on_exit(CPUOFF); // Clear CPUOFF bit from 0(SR)

}*/

#include "msp430g2231.h"

#define LED0 BIT0

#define LED1 BIT6

#define ADC_CHANNELS 2 //We will sample 2 channels

unsigned int samples[ADC_CHANNELS];

unsigned int out;

unsigned long pwr=0;

//void ConfigureAdc(void)

//{

// /* Configure ADC Channel */

// ADC10CTL1 = INCH_1 + ADC10DIV_3 ; // Channel 1, ADC10CLK/4

// ADC10CTL0 = SREF_0 + ADC10SHT_3 + ADC10ON + ADC10IE; //Vcc & Vss as reference

// ADC10AE0 |= BIT1; //P1.1 ADC option

//}

void ConfigureAdc(void)

{

/* Configure ADC Channels */

ADC10CTL1 = INCH_2 + ADC10DIV_0 + CONSEQ_3 + SHS_0; //Multi-channel repeated conversion starting from channel 2

ADC10CTL0 = SREF_0 + ADC10SHT_2 + MSC + ADC10ON + ADC10IE;

ADC10AE0 = BIT2 + BIT1;

ADC10DTC1 = ADC_CHANNELS; //ADC_CHANNELS defined to 2

}

void main(void)

{

WDTCTL = WDTPW + WDTHOLD; // Stop WDT

BCSCTL1 = CALBC1_1MHZ; // Set range

DCOCTL = CALDCO_1MHZ;

BCSCTL2 &= ~(DIVS_3); // SMCLK = DCO = 1MHz

P1DIR |= LED0 + LED1;

P1SEL |= BIT1; //ADC Input pin P1.1

P1OUT &= ~(LED0 + LED1);

ConfigureAdc();

__enable_interrupt(); // Enable interrupts.

while(1)

{

__delay_cycles(1000); // Wait for ADC Ref to settle

ADC10CTL0 &= ~ENC;

while (ADC10CTL1 & BUSY);

ADC10SA = (unsigned int)samples;

ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start

__bis_SR_register(CPUOFF + GIE); // LPM0 with interrupts enabled

if (samples[0]*samples[1] > pwr+1000)

{

pwr = ((unsigned long)samples[0])*((unsigned long)samples[1]);

out = samples[0] + 100;

P1OUT &= ~(LED0 + LED1);

P1OUT |= LED0;

}

else if (samples[0]*samples[1] < pwr-1000)

{

pwr = ((unsigned long)samples[0])*((unsigned long)samples[1]);

P1OUT &= ~(LED0 + LED1);

P1OUT |= LED1;

//pwr = pwr - 2200;

out = samples[0] - 200;

}

// ADC10 interrupt service routine

#pragma vector=ADC10_VECTOR

__interrupt void ADC10_ISR (void)

{

__bic_SR_register_on_exit(CPUOFF); // Return to active mode

}

can you now tell me which pin is configured as adc pin?

0 BrandonAzbell over 14 years ago in reply to Hari Nagarajan

TI__Guru 64920 points

It appears you have concatenated 3 examples in this last post (considering you have at least 3 instances of #include "msp430g2231.h" and 3 main() routines).

Which one are you asking about?

Also, have you reviewed the comments at the beginning of these examples to see if it provides clarity as to what the example is attempting to illustrate?

And, instead of posting the code, can you provide just the file name of the example and the zip archive literature number so I can pull it down myself and look at it? This helps in citing your source.

0 Tan Chin Yew over 13 years ago

Intellectual 490 points

i think you can refer to this one

http://www.ti.com/lit/ds/symlink/msp430g2231.pdf

start from page 37.

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msp430 adc pin configuration