c - ATTiny20 Stuck in Reset Loop after Watchdog Reset -


i using interrupt reset attiny20. here relevant code:

int main(void) {     ...      // set interrupt reset button (pcint5)     sreg |= 1<<7;           // enable global interrupts     gimsk |= 1<<pcie0;      // enable pin change interrupt 0 (enables interrupts on pcint[7:0]     pcmsk0 |= 1<<pcint5;    // enable pcint5 (physical pin 8) interrupt     ... }

the interrupt-handling function:

isr(pcint0_vect) {     if (!(button_1_port & 1<<button_1_pin))    // reset if button pushed     {            wdt_enable(wdto_2s);         while(1){};     } }

this works quite - when button pushed system freezes 2 seconds , resets... , promptly gets stuck in reset loop. bit of googling uncovered culprit: on newer chips watchdog timer left enabled (at shortest delay setting) after watchdog reset. following code meant remedy issue:

// disable watchdog on reset void wdt_init(void) __attribute__((naked)) __attribute__((section(".init3"))); void wdt_init(void) {     // mcusr = 0;    // see below reason commenting line     wdt_disable();     return; }

*n.b. mcusr = 0 commented out because mcusr not exist on attiny20. have tried replacing sreg = 0 no avail.

even code in place, should disable watchdog timer, issue persists. flashing leds on device indicate program running through part of main() function before resets, putting wdt_disable(); @ top of main() has not helped either.

is there critical i'm missing re: attiny20? i've missed in datasheet? problem - , solution - seem obvious, i'm stumped. i'm using atmel studio 6.1.

// disable watchdog on reset void wdt_init(void) __attribute__((naked)) __attribute__((section(".init3"))); void wdt_init(void) {     // flag must cleared on attiny20 before wdt can disabled     /***************/     /* rstflr = 0; */     /***************?      wdt_disable();     return; }

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