Good Day
Hi I have a question is the following
In CCS'm doing a practice which involves making a zero crossing detector to detect when the sine wave crosses zero network and additionally I put a supercapacitor or a battery to that when no mains voltage into low power mode and last toggle a pin for at least 1 hour.
I put the WDT as timer for about one second and if it finds that there is no zero crossing in 1 second then goes into low power mode.
But when I test the microcontroller takes 10 seconds and is as if it will reset and go back to doing nothing
My question is how do the test in a correct way?
Thanks
unsigned int wdtCounter = 0;
void main(void){
WDTCTL = WDT_MDLY_32; // Watchdog Timer interval to ≈32ms
IE1 |= WDTIE; // Enable WDT interrupt
P1DIR |= BIT4; // Set P1.0 to output direction
P1OUT |= BIT0; // Turn on LED at 1.0
P1IE |= BIT3; // Enable P1.3 interrupt
P1DIR &= ~BIT3; // Port 1 P1.3 (push button) as input = 0 // Enable P1.3 pull-up resistor
P1IFG &= ~0x08; // clear P1.3 interrupt flag
_BIS_SR(GIE); // Enable interrupts
while(1);
}
#pragma vector=WDT_VECTOR // Watchdog Timer interrupt service routine
__interrupt void watchdog_timer(void) {
if(wdtCounter == 32){ // 249 * 32 ms = 7968 ms, ≈ 8 s
P1OUT ^= BIT4; // P1.0 turn off, red LED
wdtCounter = 0;
_BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/interrupt
}
else
wdtCounter++;
}
#pragma vector=PORT1_VECTOR // Port 1 interrupt service routine
__interrupt void Port_1(void) {
wdtCounter = 0; // reset watchdog timer counter
// turn red LED on
P1IFG &= ~BIT3; // clear P1.3 interrupt flag
_BIC_SR(LPM0_EXIT); // wake up from low power mode
}
