I NEED CODE TO ACCELERATE AND DECCELERATE STEPPER MOTOR USING TIMERS IN MSP430F133.

Hi I m working on MSP430F133 I WANT ACCELERATION AND DECCELERATION FOR STEPPER MOTOR USING TIMERS. I HAVE A CODE TO ROTATE STEPPER MOTOR IN CONSTANT SPEED I M USING STEPPER SERVO MOTOR AND STEPPER CONTROLLER. HERE IS THE CODE.

PLZ TELL ME WAT TO CHANGE IN THE STEPPER MOTOR TO ACCELERATE AND DECCELERATE. PLZ REPLY SOON

#include <msp430f133.h>

unsigned int count=5;

#ifndef __DisableCalData

#define CALDCO_8MHZ_         (0x10FEu) /* DCOCTL Calibration Data for 1MHz */

READ_ONLY DEFC( CALDCO_8MHZ     , CALDCO_8MHZ_)

#define CALBC1_8MHZ_         (0x10FFu) /* BCSCTL1 Calibration Data for 1MHz */

READ_ONLY DEFC( CALBC1_8MHZ     , CALBC1_8MHZ_)

#endif /* #ifndef __DisableCalData */

void main(void)

{

WDTCTL = WDTPW + WDTHOLD;       // Stop watchdog timer

       BCSCTL1 = CALBC1_8MHZ;     // Set range

         DCOCTL = CALDCO_8MHZ;     // Set DCO step and modulation

P1DIR |= BIT0;                   // Set P1.0 to output direction

P1OUT &= ~BIT0;                 // Set the red LED off

P5DIR |= BIT4;                   // Set P1.6 to output direction

P5OUT &= ~BIT4;                 // Set the green LED off

TA0CCR0 = 30;                 // Count limit (16 bit)

TA0CCTL0 = 0x10;                 // Enable Timer A0 interrupts, bit 4=1

TA0CTL = TASSEL_2 + MC_1;

     // LPM0 (low power mode) interrupts enabled}     // Timer A0 with ACLK, count UP

TBCCR0 = 250;                 // Count limit (16 bit)

TBCCTL0 = 0x10;                 // Enable Timer A1 interrupts, bit 4=1

TBCTL = TBSSEL_2+ MC_1;       // Timer A1 with ACLK, count UP

     _BIS_SR(LPM0_bits + GIE);

}

#pragma vector=TIMERB0_VECTOR

__interrupt void TimerB3CCR0InterruptServiceRoutine() {

   P1OUT ^= BIT0;                 // Toggle red LED

}

#pragma vector=TIMERA0_VECTOR   // Timer0 A0 interrupt service routine

__interrupt void Timer0_A0 (void) {

     P5OUT ^= BIT4;

                     // Toggle green LED

}