Hi, all
The watchdog puzzled me for several days, why the watchdog doesn't reset after following initialization
void watchdog_init(void)
{
AT91F_WDTC_CfgPMC();
AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDV|AT91C_WDTC_WDD|AT91C_WDTC_WDRSTEN|AT91C_WDTC_WDIDLEHLT||AT91C_WDTC_WDDBGHLT;
}
but if I change "WDT_MR_Val EQU 0x00008000" to "0x3FFF2FFF" in "SAM.s", the watchdog is ok...
I notice "The Watchdog Mode Register (WDT_MR) can be written only once. Only a processor reset resets it. Writing the WDT_MR register reloads the timer with the newly programmed mode parameters." but i'm not very clear about it, if WDT_MR can be written only once, what does reloads means???
hlps, thanks

Hello!

I think reaload means that if you write the Control Register (WDT_CR) with the bit WDRSTT to 1 then the Watchdog counter is immediately reloaded from WDT_MR and restarted, starting count down from the WDV value. But if you write the WDT_SR again then a new WDV value is set and this changes the Watchdog's operation. You can write it only once means, I think, that if you want the WDT to operate as you need you must not rewrite the WDT_SR because you will lost the current value of the WDT.

TD