AVR32_software_reset.c

//Some register definitions
#ifndef WDTCTRL
	#define WDTCTRL	(*((unsigned long*)0xFFFF0D30))
#endif // WDTCTRL defined

#ifndef WDTCLR
	#define WDTCLR	(*((unsigned long*)0xFFFF0D34))
#endif // WDTCLR defined

void myAvr32SoftwareReset(void)
{
	//In AVR32, WDT module is clocked from internam 115KHz RC oscillator.
	//We use PSEL field in WDTCTRL register to set a timeout period of 2^(PSEL+1) / 115000 seconds.
	//In the code below we set a timeout period of 65536/115000 = 0.567 seconds
	
	//Let's configure Watchdog as...
	//	WDTCTRL.KEY    = [0x55, 0xAA]
	//	WDTCTRL.PSEL   = 15	(timeout period to 2^16 / 115000 => 65536/115000 seconds => 0.567 seconds
	//	WDTCTRL.EN     = 1	(enable WDT)
	WDTCTRL = 0x55000F01;
	WDTCTRL = 0xAA000F01;
	
	//Endless loop until watchdog overflow.
	while(1) {}
}


//And later, in your main function...

int main(void)
{
	// ... Variable declarations ...
	
	//Reset watchdog.
	WDTCLR = 0x0000000f;	//Any value is valid.
	//Disable watchdog by setting EN field to '0'
	WDTCTRL = 0x55000F00;
	WDTCTRL = 0xAA000F00;
	
	// ... continue with your program code ...
	
}