generating pulse by msp430 launchpad

[Jitendra Soni]

hi,

  i m new to msp430 launchpad i want to generate pulse using msp430 

please send me programme in c for this purpose....n pls tell me the method

how can i controll the pulse.....n also tell me how can i see the pulse on CRO

help me out please......

[Peter Johansson]

Not sure if this is what you are looking for, but here goes nonetheless:

/*

 *  How to use all available PWM outputs on MSP430G2553

 *

 *  Timer_A #0 has only 1 PWM output

 *  it can be sent to pins P1.1 or P2.6 (or both)

 *  (P2.6 is also the LF-XTAL, so it is best to force the VLO to the RC clock)

 *

 *  Timer_A #1 has two 2 PWM outputs

 *  output #1 can be sent to P2.1 or P2.2 

 *  output #2 can be sent to P2.4 or P2.5 

 * There are many abbreviations for the timer control ports, and this can make things

 * very confusing.  I suggest *always* using the long versions.

 *

 * CCR0 == TACCRO == TA1CCRO

 *

 */

#include "msp430.h"

int main(void)

{

    WDTCTL = WDTPW + WDTHOLD; // Stop WDT

    /*

     *  Set DCO to 16 MHz factory calibration values

     *  (not required for this demo)

     */

    BCSCTL1 = CALBC1_16MHZ; // 16 MHz

    DCOCTL  = CALDCO_16MHZ; // 16 MHz

    /*

     * Timer_A #0 block

     */

    P1DIR |= BIT2; // P1.2 to output

    P1SEL |= BIT2; // P1.2 to TA0.1

        

    BCSCTL3 = (BCSCTL3 & ~(BIT4+BIT5)) | LFXT1S_2; // use internal VLO for ACLK

    P2SEL  &= ~(BIT6+BIT7);                             // PxSEL=0, PxSEL2=0 for I/O use

    P2SEL2 &= ~(BIT6+BIT7);                             // PxSEL=0, PxSEL2=0 for I/O use

    P2DIR |= BIT6; // P2.6 to output

    P2SEL |= BIT6; // P2.6 to TA0.1

    TA0CCR0 = 64; // PWM Period

    TA0CCR1 = 48; // Timer_A 0 CCR1 PWM duty cycle 1

    TA0CCTL1 = OUTMOD_7; // CCR1 reset/set

    TA0CTL = TASSEL_2 + MC_1; // SMCLK, up mode

    /*

     * Timer_A #1 block

     */

    P2DIR |= BIT1; // P2.1 to output

    P2SEL |= BIT1; // P2.1 to TA1.1

    P2DIR |= BIT2; // P2.2 to output

    P2SEL |= BIT2; // P2.2 to TA1.1

    P2DIR |= BIT4; // P2.4 to output

    P2SEL |= BIT4; // P2.4 to TA1.2

    P2DIR |= BIT5; // P2.5 to output

    P2SEL |= BIT5; // P2.5 to TA1.2

    TA1CCR0 = 64; // PWM Period

    TA1CCTL1 = OUTMOD_7; // CCR1 reset/set

    TA1CCTL2 = OUTMOD_7; // CCR1 reset/set

    TA1CCR1 = 32; // Timer_A 1 CCR1 PWM duty cycle 1

    TA1CCR2 = 16; // Timer_A 1 CCR1 PWM duty cycle 1

    TA1CTL = TASSEL_2 + MC_1; // SMCLK, up mode

    

    /*

     *  Now just sleep forever...

     */

    for (;;) {

_BIS_SR (LPM0_bits); // Enter LPM0

    }

    // NOTREACHED

}