pwm output for 4.1 khz buzzer msp430g2533

Akila,

first, please jump over to your other thread here:

Because without a fixed time base you cannot output a PWM with a known frequency as well.

These settings

P1DIR |= BIT2;
P1SEL |= BIT2;

are OK - they connect P1.2 internally to TA0.1, but you did not configure your timer. Example for doing so:

#include "msp430g2553.h"

void main( void )
{
  BCSCTL1   = CALBC1_1MHZ;                    // 1MHz DCO
  DCOCTL    = CALDCO_1MHZ;                    // 1MHz DCO

  P1SEL    |= 0x04;                           // P1.2 to TA0.1
  P1DIR    |= 0x04;                           // P1.2 output direction

  TA0CCTL1  = OUTMOD_7;                       // reset/set for PWM
  TA0CCR0   = 244;                            // (1 / 4100Hz) / (1 / 1000000Hz) = 243.902 -> 4.1kHz frequency
  TA0CCR1   = 61;                             // 25% duty cycle
  TA0CTL    = TASSEL_2 | ID_0 | MC_1 | TACLR; // SMCLK, CLK divider 1, up-mode, clear

  while( 1 );                                 // Endless loop
}

I don't know your buzzer, so I just copied your 25% duty cycle and the PWM frequency of 4.1kHz, so please double check if these are the correct settings. If you switch to a higher DCO frequency , then change your CCRx values accordingly.

Dennis