MSP-EXP430FR2355: WDT_ISR can't use interrupt.

Lockthisname

I try to start wdt by setting in watchdog mode, using 250 msec for generate an interrupt and go to WDT_ISR

But the interrupt never generate.

Q: Can I make wdt interrupt by WDT ISR in watchdog mode?

If yes, how can I use for it.

my some code:

int main(void)

{

WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer

WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer

SFRIFG1 &= ~WDTIFG; // Clear WDT interrupt flag

WDTCTL = WDTPW | WDTTMSEL_0 | WDTCNTCL_1 | WDTIS_5 | WDTSSEL_1; // Start WDT mode, interval timer of 213.33ms, ACLK source

SFRIE1 |= WDTIE; // Enable WDT interrupt

for(;;){

//coding

}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)

#pragma vector=WDT_VECTOR

__interrupt void WDT_ISR(void)

#elif defined(__GNUC__)

void __attribute__ ((interrupt(WDT_VECTOR))) WDT_ISR (void)

#else

#error Compiler not supported!

#endif

{

SFRIE1 |= ~WDTIE; // Disable WDT interrupt

}

+1 Bruce McKenney over 3 years ago

Guru 99415 points

> WDTCTL = WDTPW | WDTTMSEL_0 | WDTCNTCL_1 | WDTIS_5 | WDTSSEL_1; // Start WDT mode, interval timer of 213.33ms, ACLK source

To get Interval Timer mode (timer interrupt, not reset) you need to set WDTTMSEL=1 [Ref User Guide (SLAU445I) Table 12-2]. Try instead:

> WDTCTL = WDTPW | WDTTMSEL_1 | WDTCNTCL_1 | WDTIS_5 | WDTSSEL_1; // Start WDT mode, interval timer of 213.33ms, ACLK source

TI Example msp430fr235x_WDT_02.c does approximately what you want (just leave out the XT1 crystal startup):

--------------

Unsolicited:

> SFRIE1 |= ~WDTIE; // Disable WDT interrupt

This doesn't disable the WDT interrupt. Try instead:

> SFRIE1 &= ~WDTIE; // Disable WDT interrupt

0 Lockthisname over 3 years ago in reply to Bruce McKenney

I got it. Thank you very much.

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