1 sec delay on msp430

Hi Senthil!

You are using ACLK for the timer. Do you have the crystal connected? By the way - the CCR value should be 32767, not 32676.

Dennis

hi Dennis 

yes i had connected two one is 32khz and crystal two is 16mhz on xt2 pin also 

senthil

>TACTL |=
Don't, many of the defines are zero values and are just place holders.
And zero don't work with OR

Do something like this

TA0CTL = TACLR;
TA0CTL = TASSEL_1 + MC_2 + ID_2;      // ACLK source, Continuous up, input divider /4

hi all ,

Still i am unable to have one sec proper delay, i mean while using ACLK the interrupt is not enabled i don know what happen even after enabling the interrupt 

hi DENNIS

#include <msp430.h>

int main(void)
{

WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P5DIR |= 0x02; // P5.1 output

CCTL0 = CCIE; // CCR0 interrupt enabled
CCR0 = 32767;
TACTL = TASSEL_1 + MC_1; // ACLK, up mode
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
}

// Timer A0 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMERA0_VECTOR))) Timer_A (void)
#else
#error Compiler not supported!
#endif
{
P5OUT ^= 0x02; // Toggle P5.1 using exclusive-OR
}

this is my code

pls reply 

senthil kumar66153 said:

i had disconnected capacitor from the crystal and its solved

Oh, OK. Did you add the capacitor yourself? I don't know which processor you are using, but on many devices you can use the internal capacitors of the MSP. There are different values that can be programmed.

 BCSCTL1 |= DIVA_4;     // div the ALCK by 4

TA0CTL = TASSEL_1 + MC_1 + ID_3; // ACLK source, up to ccr0, input divider /8

The two above combined slows it down so max is 64seconds.

senthil kumar66153 said:

I want for minute can u suggest any idea

If you have the timer running from a 32.768kHz crystal, you can use the second interval and count multiples of it:

...
TA0CCR0  = 32768;                          // 1s @ 32.768kHz crystal
TA0CCTL0 = CCIE;                           // Enable interrupts for TA0CCR0
TA0CTL   = TASSEL_1 | ID_0 | MC_2 | TACLR; // ACLK, divider 1, continuous mode, clear
...


#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer_A0( void )
{
  static uint8_t counter = 0;              // Variable for counting multiples of 1 second

  TA0CCR0 += 32768;                        // Add another second

  if( ++counter >= 60 )                    // 60 seconds elapsed
  {
    LED_POUT ^= LED_PIN;                   // Toggle LED
    counter = 0;                           // Reset counter
  }
}

Dennis

hi dennis 

i will try the code and let u know thanks for the support i will get back if i have any issue

regards 

senthil

ya dennis its fine thank u for the support