Reconfigure of WDT

RE: Reconfigure of WDT

erltot — Thu, 07 Sep 2017 19:12:33 GMT

Good to know :) thanks

RE: Reconfigure of WDT

Daniel Wang — Thu, 07 Sep 2017 19:03:59 GMT

The watchdog must be configured before it is started. After it is started, the watchdog’s configuration registers, which comprise registers CRV, RREN, and CONFIG, will be blocked for further configuration.

If you need to reconfigure WDT after it's started, you should instead look into using the RTC.

RE: Reconfigure of WDT

erltot — Wed, 06 Sep 2017 14:48:43 GMT

Still not making yourself clear. The use of that code is to reset the timer that causes the watchdog to reboot the microcontroller.. developer.mbed.org/.../WatchDog-Timer Are you sure a watchdog timer is the best option to solve your need?

RE: Reconfigure of WDT

Satheeshkumar — Wed, 06 Sep 2017 14:42:44 GMT

NRF_WDT->RR[0] = WDT_RR_RR_Reload; what is the use of this code when will reload the value after reset?

RE: Reconfigure of WDT

erltot — Wed, 06 Sep 2017 14:27:26 GMT

Extern? You mean extend? I'm not sure I understand what you want to do. If you want to change the wdt reset time "online" I guess you could test making #define WATCHDOG_SECONDS into a variable, and then calling wdt_init(); again if you change the variable.. Not sure if it will work though, you can try :-)

RE: Reconfigure of WDT

Satheeshkumar — Wed, 06 Sep 2017 14:26:58 GMT

according to project, the process may takes minimum 5 sec to max 20sec. if i have configured wdt upto 20sec, may be my process can be finished within 10sec, i should wait another 10sec to wdt reset. that why i need to extern the timer. i mean, if i configure wdt 1 sec, i can extern to another 1 sec and another 1 sec like that without wdt reset. i can not predict my process of project, when will finish. i could not do manual hard reset. i need to auto reset function. please help me

RE: Reconfigure of WDT

Satheeshkumar — Wed, 06 Sep 2017 14:18:37 GMT

thanks for reply, please help me to extern the wdt timer

RE: Reconfigure of WDT

erltot — Wed, 06 Sep 2017 11:56:06 GMT

This works for me (SDK 14.0.0 with s132) ..

In main.c:

#define WATCHDOG_SECONDS 5 /**< Time in [seconds] before watchdog resets MCU. */

/**@brief Function for initializing the watchdog.
 *
 * @details This function will be called in case of the watchdog timer not being reset at the end of the big while
 *
 * @warning This may or may not cause resets on errors when initialized
 */
void wdt_init(void){
    //Configure Watchdog. a) Pause watchdog while the CPU is halted by the debugger.  b) Keep the watchdog running while the CPU is sleeping.
	NRF_WDT->CONFIG = (WDT_CONFIG_HALT_Pause << WDT_CONFIG_HALT_Pos) | ( WDT_CONFIG_SLEEP_Run << WDT_CONFIG_SLEEP_Pos);   
	NRF_WDT->CRV = WATCHDOG_SECONDS*32768;  // timout limit
	NRF_WDT->RREN |= WDT_RREN_RR0_Msk;      // Enable reload register 0
	NRF_WDT->TASKS_START = 1;               // Start the Watchdog timer
}

int main(void){
    
    wdt_init();     //Initialize watchdog

    for(;;){
        // Application stuff
         NRF_WDT->RR[0] = WDT_RR_RR_Reload;  //Reload watchdog register 0
         power_manage();
    }     
}