read from a Analog port

//  MSP430G2231  

// Read from a analog signal from a port, and display it in bargraph format 

#include  <msp430x20x2.h>

#include <io.h>

#include <signal.h>

#include <stdlib.h>

#include <stdio.h>

char bar[9] = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x07, 0xff };

static void __inline__delay(register unsigned int n);

#define ANALOG_PIN      8

unsigned int analogRead(){

  ADC10CTL0 |= ADC10SC;

  while(ADC10CTL1 & ADC10BUSY);

  return ADC10MEM;

}

void analogPinSelect(unsigned int pin){

  if(pin < 8){

    ADC10CTL0 &= ~ENC;

    ADC10CTL1 = pin << 12;

    ADC10CTL0 = ADC10ON + ENC + ADC10SHT_0;

  }

}

void main( void )

{

int i, j, pin = 7;

char k;

WDTCTL = WDTPW + WDTHOLD; 

BCSCTL1 = CALBC1_1MHZ;

DCOCTL = CALDCO_1MHZ;

P1DIR |= 0x07; 

P1SEL = 0x00;

analogPinSelect( pin );

while( 1 )

  { 

ADC10CTL0 |= ADC10SC;             // Sampling and conversion start

k = ( analogRead() * 9) / 1024;  

j = bar[k];

P1OUT &= ~BIT2;

for(i=0; i < 8; i++)

   {    

   P1OUT &= ~BIT1;

   if  (j & 0x01)

      {

      P1OUT |= BIT0;

      }else{

      P1OUT &= ~BIT0;

      }

P1OUT |= BIT1;

   j = j>>1;

   }

P1OUT |= BIT2;

}

}

// Delay Routine from mspgcc help file

static void __inline__delay(register unsigned int n)

{

  __asm__ __volatile__ (

  "1: \n"

  " dec %[n] \n"

  " jne 1b \n"

        : [n] "+r"(n));

}