MSP430F5659: Timer Interrupt Issue

Could there be some very short pulse (or noise) on the capture input causing it to trigger?

Hi ,

I made a small correction in the below thread. So I repost
This happens with frequency range 1000HZ/5000HZ as well

I am using timer interrupt (Timer 0_A1) for pulse measurement. Normal case timer interrupt occurs as expected.
Sometimes timer stops automatically. Please find below our timer intial values for start/stop condition.



Timer Initialization

TA0CTL = TASSEL_2 + TACLR; // SMCLK

TA0CCTL1 = CM_1 + CCIS_0 + SCS + CAP; /* ACTIVE PULSE */

TA0CTL |= MC_2;


Start Timer Function

TA0CCTL1 |= CCIE;


Stop Timer Function

TA0CCTL1 &= ~CCIE;



Interrupt Function;

We take the current edge time using TA0CCR1 register
currentEdgeTime = TA0CCR1



My checkpoint:
If suppose start the timer as per above function and I didn't stop the timer as per above function. Again I started the timer .
Will it cause the timer stops?


Kindly advice the your input for possible reasons for timer stops. Please advice on this issue.




Regards

Manoj

Your start and stop timer functions would be better understood if you had them named "enable timer interrupt" and "disable timer interrupt".
This being said, nothing would happen if you re-enabled and already enabled interrupt.

Maybe you should clear the TA0R by issuing a TA0CLR within your start function.

Thanks a lot for your reply. Let me check on your input.

Hi Manoj,

Have you been able to find a solution for your timer interrupt?

Thanks,
Ryan