PWM via ADC in MSP430 ez430-Rf2500

This is the code I am using to generate PWM via ADC on target board of  MSP430 ez430-Rf2500. The PWM doesn not vary rather it attains a 50% duty cycle after the ADC moves from 0 to any other value.

Its works as for ADC= 0 PWM =0 ; ADC<=1024 PWM =50%

I require a code in which there is variation of PWM with ADC ; from 0 to 100% duty cycle.

Require immediate help.

"

#include "msp430x22x4.h"

void main(void)

{

  WDTCTL = WDT_MDLY_32;                     // WDT ~27ms interval timer

  IE1 |= WDTIE;                             // Enable WDT interrupt

  ADC10CTL0 = ADC10SHT_2 + ADC10ON;

  ADC10AE0 |= 0x01;                         // P2.0 ADC option select

  ADC10DTC1 = 0x01;                         // 1 conversion

  P1DIR |= 0x04;                            // P1.2 = output

  P1SEL |= 0x04;                            // P1.2 = TA1 output

  TACCR0 = 1024 - 1;                        // PWM Period

  TACCTL1 = OUTMOD_7;                       // TACCR1 reset/set

  TACCR1 = 512;                             // TACCR1 PWM Duty Cycle

  TACTL = TASSEL_2 + MC_1;                  // SMCLK, upmode

  while(1)

  {

    __bis_SR_register(LPM0_bits + GIE);     // LPM0, WDT_ISR will force exit

    ADC10SA = (unsigned int)&TACCR1;        // Data transfer location

    ADC10CTL0 |= ENC + ADC10SC;             // Start sampling

  }

}

#pragma vector = WDT_VECTOR

__interrupt void WDT_ISR(void)

     {

  __bic_SR_register_on_exit(LPM0_bits);     // Exit LPM0

}

"